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Physical Review Letters[JOURNAL]

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Dynamical Control of Quantum Photon-Photon Interaction with Phase Change Material.

Wang C, Li X, Ma X … +6 more , Zhang Y, Wu M, Lu W, Chen Y, Sui X, Chen L

Phys Rev Lett · 2026 May · PMID 42251544 · Publisher ↗

Quantum interference can produce pivotal effective photon-photon interactions, enabling the exploration of various quantum information technologies that are beyond the possibilities of classical physics. While this effec... Quantum interference can produce pivotal effective photon-photon interactions, enabling the exploration of various quantum information technologies that are beyond the possibilities of classical physics. While this effective interaction is fundamentally limited to the bosonic nature of photons and the restricted phase responses from commonly used unitary optical elements, loss-induced nonunitary operations provide an alternative degree of freedom to control quantum interference. Here, we propose and experimentally demonstrate a concise yet powerful tool to unravel the essential features of quantum interference based on the phase change material vanadium dioxide. Since the insulator-metal transition in an elaborate vanadium dioxide thin film can create any desired particle exchange phase response, harnessing its phase transition would allow the dynamical control of photon-photon interaction such that the conventional coalescence and the anomalous anti-coalescence of photons can be continuously tuned. These results highlight an alternative approach for investigating quantum light-matter interactions, and facilitate nonunitary quantum interference for various quantum information processing tasks.
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Precise Measurement of Matter-Antimatter Asymmetry with Entangled Hyperon-Antihyperon Pairs.

Ablikim M, Achasov MN, Adlarson P … +710 more , Ai XC, Aliberti R, Amoroso A, An Q, Bai Y, Bakina O, Ban Y, Bao HR, Bao XL, Batozskaya V, Begzsuren K, Berger N, Berlowski M, Bertani MB, Bettoni D, Bianchi F, Bianco E, Bortone A, Boyko I, Briere RA, Brueggemann A, Cai H, Cai MH, Cai X, Calcaterra A, Cao GF, Cao N, Cetin SA, Chai XY, Chang JF, Chang TT, Che GR, Che YZ, Chen CH, Chen C, Chen G, Chen HS, Chen HY, Chen ML, Chen SJ, Chen SM, Chen T, Chen W, Chen XR, Chen XT, Chen XY, Chen YB, Chen YQ, Chen ZK, Cheng J, Cheng LN, Choi SK, Chu X, Cibinetto G, Cossio F, Cottee-Meldrum J, Dai HL, Dai JP, Dai XC, Dbeyssi A, de Boer RE, Dedovich D, Deng CQ, Deng ZY, Denig A, Denisenko I, Destefanis M, De Mori F, Ding XX, Ding Y, Ding YX, Dong J, Dong LY, Dong MY, Dong X, Du MC, Du SX, Du SX, Du XL, Duan YY, Duan ZH, Egorov P, Fan GF, Fan JJ, Fan YH, Fang J, Fang J, Fang SS, Fang WX, Fang YQ, Fava L, Feldbauer F, Felici G, Feng CQ, Feng JH, Feng L, Feng QX, Feng YT, Fritsch M, Fu CD, Fu JL, Fu YW, Gao H, Gao Y, Gao YN, Gao YN, Gao YY, Gao Z, Garbolino S, Garzia I, Ge L, Ge PT, Ge ZW, Geng C, Gersabeck EM, Gilman A, Goetzen K, Gollub J, Gong JD, Gong L, Gong WX, Gradl W, Gramigna S, Greco M, Gu MD, Gu MH, Guan CY, Guo AQ, Guo JN, Guo LB, Guo MJ, Guo RP, Guo X, Guo YP, Guskov A, Gutierrez J, Han TT, Hanisch F, Hao KD, Hao XQ, Harris FA, He CZ, He KL, Heinsius FH, Heinz CH, Heng YK, Herold C, Hong PC, Hou GY, Hou XT, Hou YR, Hou ZL, Hu HM, Hu JF, Hu QP, Hu SL, Hu T, Hu Y, Hu ZM, Huang GS, Huang KX, Huang LQ, Huang P, Huang XT, Huang YP, Huang YS, Hussain T, Hüsken N, In der Wiesche N, Jackson J, Ji Q, Ji QP, Ji W, Ji XB, Ji XL, Jia XQ, Jia ZK, Jiang D, Jiang HB, Jiang PC, Jiang SJ, Jiang XS, Jiang Y, Jiao JB, Jiao JK, Jiao Z, Jin LCL, Jin S, Jin Y, Jing MQ, Jing XM, Johansson T, Kabana S, Kang XL, Kang XS, Ke BC, Khachatryan V, Khoukaz A, Kolcu OB, Kopf B, Kröger L, Kuessner M, Kui X, Kumar N, Kupsc A, Kühn W, Lan Q, Lan WN, Lei TT, Lellmann M, Lenz T, Li C, Li C, Li CH, Li CK, Li DM, Li F, Li G, Li HB, Li HJ, Li HL, Li HN, Li H, Li JR, Li JS, Li JW, Li K, Li KL, Li LJ, Li L, Li MH, Li MR, Li PL, Li PR, Li QM, Li QX, Li R, Li SX, Li S, Li T, Li TY, Li WD, Li WG, Li X, Li XH, Li XK, Li XL, Li XY, Li XZ, Li Y, Li YG, Li YP, Li ZH, Li ZJ, Li ZX, Li ZY, Liang C, Liang H, Liang YF, Liang YT, Liao GR, Liao LB, Liao MH, Liao YP, Libby J, Limphirat A, Lin DX, Lin LQ, Lin T, Liu BJ, Liu BX, Liu CX, Liu F, Liu FH, Liu F, Liu GM, Liu H, Liu HB, Liu HM, Liu H, Liu JB, Liu JJ, Liu K, Liu K, Liu KY, Liu K, Liu L, Liu LC, Liu L, Liu MH, Liu PL, Liu Q, Liu SB, Liu WM, Liu WT, Liu X, Liu XK, Liu XL, Liu XY, Liu Y, Liu Y, Liu YB, Liu ZA, Liu ZD, Liu ZQ, Liu ZY, Lou XC, Lu HJ, Lu JG, Lu XL, Lu Y, Lu YH, Lu YP, Lu ZH, Luo CL, Luo JR, Luo JS, Luo MX, Luo T, Luo XL, Lv ZY, Lyu XR, Lyu YF, Lyu YH, Ma FC, Ma HL, Ma H, Ma JL, Ma LL, Ma LR, Ma QM, Ma RQ, Ma RY, Ma T, Ma XT, Ma XY, Ma YM, Maas FE, MacKay I, Maggiora M, Malde S, Malik QA, Mao HX, Mao YJ, Mao ZP, Marcello S, Marshall A, Melendi FM, Meng YH, Meng ZX, Mezzadri G, Miao H, Min TJ, Mitchell RE, Mo XH, Moses B, Muchnoi NY, Muskalla J, Nefedov Y, Nerling F, Neuwirth H, Ning Z, Nisar S, Niu QL, Niu WD, Niu Y, Normand C, Olsen SL, Ouyang Q, Pacetti S, Pan X, Pan Y, Pathak A, Pei YP, Pelizaeus M, Peng HP, Peng XJ, Peng YY, Peters K, Petridis K, Ping JL, Ping RG, Plura S, Prasad V, Qi FZ, Qi HR, Qi M, Qian S, Qian WB, Qiao CF, Qiao JH, Qin JJ, Qin JL, Qin LQ, Qin LY, Qin PB, Qin XP, Qin XS, Qin ZH, Qiu JF, Qu ZH, Rademacker J, Redmer CF, Rivetti A, Rolo M, Rong G, Rong SS, Rosini F, Rosner C, Ruan MQ, Salone N, Sarantsev A, Schelhaas Y, Schoenning K, Scodeggio M, Shan W, Shan XY, Shang ZJ, Shangguan JF, Shao LG, Shao M, Shen CP, Shen HF, Shen WH, Shen XY, Shi BA, Shi H, Shi JL, Shi JY, Shi SY, Shi X, Song HL, Song JJ, Song MH, Song TZ, Song WM, Song YX, Song Z, Sosio S, Spataro S, Stansilaus S, Stieler F, Stolte M, Su SS, Sun GB, Sun GX, Sun H, Sun HK, Sun JF, Sun K, Sun L, Sun R, Sun SS, Sun T, Sun WY, Sun YC, Sun YH, Sun YJ, Sun YZ, Sun ZQ, Sun ZT, Tang CJ, Tang GY, Tang J, Tang JJ, Tang LF, Tang YA, Tao LY, Tat M, Teng JX, Tian JY, Tian WH, Tian Y, Tian ZF, Uman I, van der Smagt E, Wang B, Wang B, Wang B, Wang C, Wang C, Wang C, Wang DY, Wang HJ, Wang HR, Wang J, Wang JJ, Wang JP, Wang K, Wang LL, Wang LW, Wang M, Wang M, Wang NY, Wang S, Wang S, Wang T, Wang TJ, Wang W, Wang WP, Wang X, Wang XF, Wang XL, Wang XN, Wang X, Wang Y, Wang YD, Wang YF, Wang YH, Wang YJ, Wang YL, Wang YN, Wang YN, Wang Y, Wang Y, Wang Y, Wang Z, Wang Z, Wang ZL, Wang ZQ, Wang ZY, Wang Z, Wei D, Wei DH, Wei HR, Weidner F, Wen SP, Wiedner U, Wilkinson G, Wolke M, Wu JF, Wu LH, Wu LJ, Wu L, Wu SG, Wu SM, Wu XW, Wu YJ, Wu Z, Xia L, Xiang BH, Xiao D, Xiao GY, Xiao H, Xiao YL, Xiao ZJ, Xie C, Xie KJ, Xie Y, Xie YG, Xie YH, Xie ZP, Xing TY, Xiong DB, Xu CJ, Xu GF, Xu HY, Xu M, Xu QJ, Xu QN, Xu TD, Xu XP, Xu Y, Xu YC, Xu ZS, Yan F, Yan L, Yan WB, Yan WC, Yan WH, Yan WP, Yan XQ, Yan YY, Yang HJ, Yang HL, Yang HX, Yang JH, Yang RJ, Yang Y, Yang YH, Yang YQ, Yang YZ, Yao ZP, Ye M, Ye MH, Ye ZJ, Yin J, You ZY, Yu BX, Yu CX, Yu G, Yu JS, Yu LW, Yu T, Yu XD, Yu YC, Yu YC, Yuan CZ, Yuan H, Yuan J, Yuan J, Yuan L, Yuan MK, Yuan SH, Yuan Y, Yue CX, Yue Y, Zafar AA, Zeng FR, Zeng SH, Zeng X, Zeng YJ, Zeng YJ, Zhai YC, Zhan YH, Zhang SN, Zhang BL, Zhang BX, Zhang DH, Zhang GY, Zhang GY, Zhang H, Zhang H, Zhang HC, Zhang HH, Zhang HQ, Zhang HR, Zhang HY, Zhang J, Zhang JJ, Zhang JL, Zhang JQ, Zhang JS, Zhang JW, Zhang JX, Zhang JY, Zhang JZ, Zhang J, Zhang LM, Zhang L, Zhang N, Zhang P, Zhang Q, Zhang QY, Zhang RY, Zhang SH, Zhang S, Zhang XM, Zhang XY, Zhang Y, Zhang Y, Zhang YT, Zhang YH, Zhang YP, Zhang ZD, Zhang ZH, Zhang ZL, Zhang ZL, Zhang ZX, Zhang ZY, Zhang ZY, Zhang ZY, Zhang ZZ, Zhao G, Zhao JY, Zhao JZ, Zhao L, Zhao L, Zhao MG, Zhao SJ, Zhao YB, Zhao YL, Zhao YP, Zhao YX, Zhao ZG, Zhemchugov A, Zheng B, Zheng BM, Zheng JP, Zheng WJ, Zheng XR, Zheng YH, Zhong B, Zhong C, Zhou H, Zhou JQ, Zhou S, Zhou X, Zhou XK, Zhou XR, Zhou XY, Zhou YX, Zhou YZ, Zhu AN, Zhu J, Zhu K, Zhu KJ, Zhu KS, Zhu LX, Zhu L, Zhu SH, Zhu TJ, Zhu WD, Zhu WJ, Zhu WZ, Zhu YC, Zhu ZA, Zhuang XY, Zou JH, BESIII Collaboration

Phys Rev Lett · 2026 May · PMID 42251543 · Publisher ↗

A search for CP violation with an entangled system of Ξ^{-}Ξ[over ¯]^{+} pairs is performed, using (10,087±44)×10^{6}  J/ψ events collected with the BESIII experiment. A nine-dimensional helicity amplitude is used to fit... A search for CP violation with an entangled system of Ξ^{-}Ξ[over ¯]^{+} pairs is performed, using (10,087±44)×10^{6}  J/ψ events collected with the BESIII experiment. A nine-dimensional helicity amplitude is used to fit e^{+}e^{-}→J/ψ→Ξ^{-}Ξ[over ¯]^{+} and its subsequent decays. The Ξ^{-} and Ξ[over ¯]^{+} decay parameters are determined with higher precision compared to the best results reported so far. Furthermore, the strong phase difference, (δ_{P}-δ_{S})=(0.3±1.2±0.2)×10^{-2}  rad, and the weak phase difference, (ξ_{P}-ξ_{S})=(-0.2±1.2±0.1)×10^{-2}  rad, are directly determined. These are the most precise measurements to date. The CP asymmetry observables A_{CP}^{Ξ}=(-7.8±4.8±0.8)×10^{-3} and Δϕ_{CP}^{Ξ}=(0.6±5.1±0.2)×10^{-3}  rad are determined, which are consistent with CP conservation. In addition, independent measurements of the Λ decay parameter and CP asymmetry A_{CP}^{Λ}=(-2.9±4.3±0.7)×10^{-3} are also obtained, which are in agreement with the previous measurements, but with much improved precision.
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Numerical Evolution of Self-Gravitating Halos of Self-Interacting Dark Matter.

Kamionkowski M, Sigurdson K, Slone O

Phys Rev Lett · 2026 May · PMID 42251542 · Publisher ↗

We discuss a modification of a recently developed numerical scheme for evolving spherically symmetric self-gravitating systems to include the effects of self-interacting dark matter. The approach is far more efficient th... We discuss a modification of a recently developed numerical scheme for evolving spherically symmetric self-gravitating systems to include the effects of self-interacting dark matter. The approach is far more efficient than traditional N-body simulations and cross sections with different dependencies on velocity and scattering angle are easily accommodated. To demonstrate, we provide results of a simulation, which runs quickly on a personal computer, that shows the expected initial flattening of the inner region of a Navarro-Frenk-White (NFW) halo as well as the later gravothermal collapse instability that leads to a dense core at the galactic center. We note that this approach can also be used, with some augmentation, to simulate the dynamics in globular clusters by modeling gravitational hard scattering as a self-interaction.
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Resolving Structural Avalanches in Amorphous Carbon with Arclength Continuation.

Birks F, Ghanem I, Pastewka L … +2 more , Kermode J, Buze M

Phys Rev Lett · 2026 May · PMID 42251541 · Publisher ↗

Plastic deformation in amorphous solids is carried by localized shear transformations that self-organize into avalanches. In amorphous carbon modeled with a machine-learned interatomic potential, we find that the energet... Plastic deformation in amorphous solids is carried by localized shear transformations that self-organize into avalanches. In amorphous carbon modeled with a machine-learned interatomic potential, we find that the energetics and organization of these avalanches can be resolved by systematically following the underlying energy landscape. With a pseudoarclength numerical continuation framework, we decompose avalanches into constituent shear transformations and determine their strain-dependent energetics. Our analysis shows that, prior to onset, avalanches have a latent structure that consists of well-separated local minima. We further demonstrate that arclength continuation yields an event driven framework for following avalanche dynamics, eliminating time-step effects on statistical avalanche properties such as distributions of stress drops.
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Measurement of the Ground State Spin and Parity of ^{22}Al Disfavors Halo Formation.

Jensen EAM, Nielsen JS, Johansson BSO … +13 more , Adams A, Dopfer J, Sumithrarachchi CS, Sun LJ, Weghorn LE, Wheeler T, Wrede C, Borge MJG, Tengblad O, Madurga M, Jonson B, Riisager K, Fynbo HOU

Phys Rev Lett · 2026 May · PMID 42251540 · Publisher ↗

We report the decisive resolution of the ground state spin and parity of the proton-drip line nucleus ^{22}Al, a prime candidate for a proton halo. The resolution stems from the first β-delayed charged particle emission... We report the decisive resolution of the ground state spin and parity of the proton-drip line nucleus ^{22}Al, a prime candidate for a proton halo. The resolution stems from the first β-delayed charged particle emission experiment in the gas stopping area at the Facility for Rare Isotope Beams (FRIB), leveraging high-intensity, low-energy beams extracted from the Advanced Cryogenic Gas Stopper (ACGS). The pristine beam quality from FRIB and the ACGS enabled a sensitive particle identification technique using thin silicon detectors, allowing for the suppression of the dominant proton background and the first observation of the weak β-delayed α transition from the isobaric analog state in ^{22}Mg to the ^{18}Ne ground state. This observation uniquely fixes the ^{22}Al ground state as 4^{+}. The valence proton is confined by a dominant d-wave centrifugal barrier which, combined with the Coulomb repulsion, hinders the tunneling required for halo formation despite the exceptionally low proton separation energy of ^{22}Al.
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Magnetochiral Anisotropy in Josephson Diode Effect of All-Metallic Lateral Junctions with Interfacial Rashba Spin-Orbit Coupling.

Mangold M, Bauriedl L, Berger J … +7 more , Yu-Cheng C, Meier TNG, Kronseder M, Hakonen P, Back CH, Strunk C, Suri D

Phys Rev Lett · 2026 May · PMID 42251539 · Publisher ↗

We explore the role of interfacial Rashba spin-orbit coupling (SOC) for the Josephson diode effect in all-metal diffusive Josephson junctions. Devices with Fe/Pt and Cu/Pt weak links between Nb leads reveal a Josephson d... We explore the role of interfacial Rashba spin-orbit coupling (SOC) for the Josephson diode effect in all-metal diffusive Josephson junctions. Devices with Fe/Pt and Cu/Pt weak links between Nb leads reveal a Josephson diode effect in an in-plane magnetic field with magnetochiral anisotropy according to the point symmetry of Rashba SOC. The Rashba SOC originates from inversion symmetry breaking at the metal-metal interfaces. A control sample with a plain Cu layer as weak link, in contrast, exhibits an axis-symmetric diode effect. The Fraunhofer patterns display an apparent inverted hysteresis that can be traced back to stray fields resulting from the conventional hysteretic vortex pinning in the Nb contacts.
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Fifth-Force Constraints from UV-Complete Scalar-Tensor Gravity.

Bonanno AM, Glaviano EM

Phys Rev Lett · 2026 May · PMID 42251538 · Publisher ↗

We study an O(N) scalar multiplet nonminimally coupled to gravity and follow its renormalization-group (RG) flow in the vicinity of an interacting, nonperturbatively UV-complete scaling regime of scalar-tensor theory. In... We study an O(N) scalar multiplet nonminimally coupled to gravity and follow its renormalization-group (RG) flow in the vicinity of an interacting, nonperturbatively UV-complete scaling regime of scalar-tensor theory. In the broken phase, the radial mode mediates a universal Yukawa correction to Newtonian gravity, parametrized by a strength α_{Y} and range λ_{Y}. Imposing UV completeness-regular RG trajectories that reach the UV scaling regime-restricts the infrared data to a finite wedge, which maps to a narrow region in the (α_{Y},λ_{Y}) plane. Its complement is, therefore, ruled out by UV completeness alone. Remarkably, part of this theory-excluded domain lies below current experimental exclusion envelopes, so improved fifth-force searches can directly test and potentially falsify this class of UV-complete scalar-tensor models.
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Bose-Hubbard Model with Power-Law Hopping in One Dimension.

Gupta T, Prokof'ev NV, Pupillo G

Phys Rev Lett · 2026 May · PMID 42213964 · Publisher ↗

We investigate the zero-temperature phase diagram of the one-dimensional Bose-Hubbard model with power-law hopping decaying with distance as 1/r^{α} using exact large scale quantum Monte Carlo simulations. For all 1<α≤3... We investigate the zero-temperature phase diagram of the one-dimensional Bose-Hubbard model with power-law hopping decaying with distance as 1/r^{α} using exact large scale quantum Monte Carlo simulations. For all 1<α≤3 the quantum phase transition from a superfluid and a Mott insulator at unit filling is found to be continuous and scale invariant, in marked contrast with the Berezinskii-Kosterlitz-Thouless (BKT) scenario that is recovered only for α>3. By performing finite-size scaling collapses of the superfluid stiffness and extracting dynamical and correlation-length exponents from the low-energy spectrum, we establish that these transitions define a distinct universality class throughout the long-range regime 1<α≤3. Analysis of the single-particle correlation functions and grand canonical phase diagram further reveals a sequence of ordering regimes within the superfluid phase: true long-range order for α≤2, anomalous quasi-long-range order for 2<α≤3, and conventional algebraic decay for α>3. Our exact numerical results provide a benchmark to compare theories of long-range quantum models and are relevant for experiments with cold neutral atom, molecules and ion chains.
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Photonic Analogy of Continuous Time Crystal Induced by Photorefractive Effect.

Chen Z, Liu J, Liu Q … +6 more , Zhang D, Zheng D, Wu W, Cai W, Ren M, Xu J

Phys Rev Lett · 2026 May · PMID 42213963 · Publisher ↗

Continuous time crystals (CTCs) are nonequilibrium phases that spontaneously break continuous time-translation symmetry to sustain persistent oscillations under time-invariant driving. Here we report the first realizatio... Continuous time crystals (CTCs) are nonequilibrium phases that spontaneously break continuous time-translation symmetry to sustain persistent oscillations under time-invariant driving. Here we report the first realization of CTC in a photorefractive carrier-transport system, using iron-doped lithium niobate (LiNbO_{3}) crystals under continuous-wave optical excitation. In this platform, carrier-driven nonlinearities give rise to persistent, tunable oscillations of phase-conjugate waves, directly evidencing time-crystalline order at room temperature. By varying excitation conditions, the ordered CTC phase evolves into intermittent chaotic dynamics with quasicrystal-like temporal features, where spikelike fluctuations reveal critical behavior near nonequilibrium phase transitions. Our work demonstrates that photorefractive carrier transport provides a solid-state route to time-crystalline order, offering new opportunities to probe symmetry breaking and criticality in driven many-body systems.
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Analytic Discrete Self-Similar Solutions of Einstein-Klein-Gordon at Large D.

Ecker C, Ecker F, Grumiller D

Phys Rev Lett · 2026 May · PMID 42213962 · Publisher ↗

Discretely self-similar solutions govern critical collapse and have been known only numerically since Choptuik's pioneering work. Using the large-D expansion, where D is the spacetime dimension, we construct an infinite... Discretely self-similar solutions govern critical collapse and have been known only numerically since Choptuik's pioneering work. Using the large-D expansion, where D is the spacetime dimension, we construct an infinite family of analytic solutions of the Einstein-massless-Klein-Gordon equations. In this limit, the field equations simplify drastically, and the solutions are encoded in a single function of time. We characterize their structure and compare them with numerical critical solutions at finite D, identifying both universal features and effects specific to large D.
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Fragility of Topology under Electronic Correlations in Iron Chalcogenides.

Kim Y, Yoo J, Kim S … +5 more , Hahn S, Tanaka K, Yu L, Kim M, Kim C

Phys Rev Lett · 2026 May · PMID 42213961 · Publisher ↗

The interplay between electronic correlations and topology is a central topic in the study of quantum materials. In this Letter, we investigate the impact of the orbital-selective Mott phase (OSMP) on the topological pro... The interplay between electronic correlations and topology is a central topic in the study of quantum materials. In this Letter, we investigate the impact of the orbital-selective Mott phase (OSMP) on the topological properties of FeTe_{1-x}Se_{x} (FTS), an iron chalcogenide superconductor known to host both nontrivial Z_{2} topology and strong electronic correlations. Using angle-resolved photoemission spectroscopy, we track the evolution of topological surface states across various doping levels and temperatures. We identify a topological phase transition between trivial and nontrivial topology as a function of selenium content, with critical behavior observed between x=0.04 and x=0.09. Additionally, we find that at elevated temperatures, the coherence of the topological surface state deteriorates due to the emergence of OSMP, despite the topological invariant remaining intact. Our results demonstrate that the nontrivial topology in iron chalcogenide is fragile under strong electronic correlations.
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Multistimuli-Controlled Topological Nucleation of Skyrmion Loops and Monopoles in Liquid Crystals.

Shi Q, Zhang J, Tang W … +9 more , Asilehan Z, Tian K, Zheng X, Vergara F, Wang R, Li J, Zhang R, Jiang J, Peng C

Phys Rev Lett · 2026 May · PMID 42213960 · Publisher ↗

Topological solitons hold great promise for revolutionizing information and energy technologies, yet their controlled creation remains a major challenge. Here, we demonstrate room-temperature nucleation of fractional, sk... Topological solitons hold great promise for revolutionizing information and energy technologies, yet their controlled creation remains a major challenge. Here, we demonstrate room-temperature nucleation of fractional, skyrmion loops-three-dimensional, half-integer topological defects-within a nematic liquid crystal microfluidic cell. A single beam of linearly polarized light rotates the surface alignment, accumulating elastic twist until a topologically trivial texture collapses into a robust skyrmion loop. The loop's cross section continuously morphs between half Néel skyrmions, antiskyrmions, and bimerons. Real-time polarized microscopy and Landau-de Gennes free energy based simulations reveal that the transition occurs via a 2π twist discontinuity and a sharp energy drop. The same protocol can be triggered by electric fields or local heating, and spawns a pair of ±1 topological monopoles that migrate along the loop to minimize the free energy. Our findings establish nematic liquid crystals as an optically rewritable, low-energy platform for generating arbitrary three-dimensional topological textures, offering immediate avenues for reconfigurable photonics and topological metamaterials.
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Search for Dark Particles in K_{L}^{0}→γX at the KOTO Experiment.

Wu T, Tung YC, Hsiung YB … +25 more , Ahn JK, Gonzalez M, Kim EJ, Komatsubara TK, Kotera K, Lee SK, Lim GY, Lin C, Matsumura T, Nanjo H, Noichi Y, Nomura T, Nunes T, Ono K, Redeker J, Shimizu N, Shinohara S, Shiomi K, Shiraishi R, Tajima Y, Wah YW, Watanabe H, Yamanaka T, Yoshida HY, KOTO Collaboration

Phys Rev Lett · 2026 May · PMID 42213959 · Publisher ↗

We report a search for an invisible particle X in the decay K_{L}^{0}→γX (X→invisible), where X can be interpreted as a massless or massive dark photon. No evidence for X was found, based on 13 candidate events consisten... We report a search for an invisible particle X in the decay K_{L}^{0}→γX (X→invisible), where X can be interpreted as a massless or massive dark photon. No evidence for X was found, based on 13 candidate events consistent with a predicted background of 12.66±4.42_{stat}±2.13_{syst} events. Upper limits on the branching ratio of K_{L}^{0}→γX were set for the X mass range 0≤m_{X}≤425  MeV/c^{2}. For massless X, the upper limit was 3.4×10^{-7} at the 90% confidence level, improving the previous indirect bound by over three orders of magnitude. This result yielded a new lower bound of 4.1×10^{6}  TeV on the probed effective mass scale governing flavor-changing dark-photon couplings, representing approximately two orders of magnitude improvement on existing constraints. For massive X, the upper limits in the searched mass region ranged from O(10^{-7}) to O(10^{-3}).
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Multiqubit Elegant Joint Measurement.

Pauwels J, Gisin N

Phys Rev Lett · 2026 May · PMID 42213958 · Publisher ↗

The elegant joint measurement (EJM) is a highly symmetric, partially entangled two-qubit measurement whose local marginals form a regular tetrahedron on the Bloch sphere and which has a low entanglement cost for local im... The elegant joint measurement (EJM) is a highly symmetric, partially entangled two-qubit measurement whose local marginals form a regular tetrahedron on the Bloch sphere and which has a low entanglement cost for local implementation. It plays a central role in quantum networks exhibiting nonclassical correlations and serves as a paradigmatic example of an entangled measurement with local structure. Despite its significance, generalizing the EJM beyond two qubits has remained unresolved. Here, we extend the EJM to the multipartite setting by identifying all tetrahedrally symmetric, efficiently localizable multiqubit bases. For two qubits, these criteria uniquely select the EJM. For three or more, they yield a discrete set of equivalence classes, reflecting the richer structure of multiparticle entanglement.
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Discrete Time Crystals in Actively Mode-Locked Lasers.

Weng R, Koch ER, Yelo-Sarrión J … +4 more , Batle J, Broderick NGR, Javaloyes J, Gurevich SV

Phys Rev Lett · 2026 May · PMID 42213957 · Publisher ↗

We report the first experimental observation of discrete time crystal phases and crystallites in an actively mode-locked semiconductor laser. By tuning either the bias current or the modulation frequency, the system unde... We report the first experimental observation of discrete time crystal phases and crystallites in an actively mode-locked semiconductor laser. By tuning either the bias current or the modulation frequency, the system undergoes a spontaneous symmetry-breaking transition from the harmonically mode-locked state toward robust, highly coherent time crystal states that persist indefinitely. Two equivalent time crystal configurations can coexist as domains separated by sharp, long-lived boundaries analogous to domain walls. The phenomenon is successfully reproduced by a time-delayed model. Our findings demonstrate that mode-locked semiconductor lasers offer a readily accessible platform to explore and control nonequilibrium phases of light, enabling practical implementations of time crystal physics in photonic systems.
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High-Resolution Laser Spectroscopy on the Hyperfine Structure of ^{255}Fm (Z=100).

Urquiza-González M, Stemmler M, Albrecht TE … +36 more , Bally B, Bender M, Berndt S, Block M, Brizard A, Andrews JS, Bieroń J, Chhetri P, Dorrer H, Düllmann CE, Ezold JG, Goriely S, Gutiérrez MJ, Hanstorp D, Hasse R, Heinke R, Hens K, Hilaire S, Kaja M, Kieck T, Kneip N, Köster U, Loria Basto AT, Mokry C, Münzberg D, Myhre K, Niemeyer T, Péru S, Raeder S, Renisch D, Runke J, Schrell SK, Studer D, van Beek K, Warbinek J, Wendt K

Phys Rev Lett · 2026 May · PMID 42213956 · Publisher ↗

We report on high-resolution laser spectroscopy of ^{255}Fm (T_{1/2}=20  h), one of the heaviest nuclides available from reactor breeding. The hyperfine structures in two different atomic ground-state transitions at 398.... We report on high-resolution laser spectroscopy of ^{255}Fm (T_{1/2}=20  h), one of the heaviest nuclides available from reactor breeding. The hyperfine structures in two different atomic ground-state transitions at 398.4 nm and 398.2 nm were probed by in-source laser spectroscopy at the RISIKO mass separator in Mainz, using the perpendicularly illuminated laser ion source and trap (PI-LIST) high-resolution ion source. Experimental results were combined with hyperfine fields from various atomic ab initio calculations, in particular using multiconfiguration Dirac-Hartree-Fock theory, as implemented in grasp18. In this manner, the nuclear magnetic dipole and electric quadrupole moments were derived to be μ=-0.75(5)  μ_{N} and Q_{s}=+5.84(13)  eb, respectively. The magnetic moment indicates occupation of the ν7/2[613] Nilsson orbital, while the large quadrupole moment confirms strong, stable prolate deformation consistent with systematics in the heavy actinides. Comparisons with available expectation values from nuclear theory show good agreement, providing a stringent benchmark for the used theoretical models. These results revise earlier data and establish ^{255}Fm as a reference isotope for future high-resolution studies.
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Dual-Zero-Scattering in Diffusive Transport.

Zhang Y, Liu J, Xu L … +3 more , Jin P, Marchesoni F, Huang J

Phys Rev Lett · 2026 May · PMID 42213955 · Publisher ↗

Achieving invisibility in diffusive fields with metamaterials has long been hindered by a fundamental trade-off: suppressing external scattering by means of a metamaterial shell inevitably distorts the shell's internal f... Achieving invisibility in diffusive fields with metamaterials has long been hindered by a fundamental trade-off: suppressing external scattering by means of a metamaterial shell inevitably distorts the shell's internal field, precluding perfect transparency. We overcome this limitation by introducing a dual-zero-scattering regime that simultaneously eliminates scattering in both the background medium and the metamaterial shell. Through a unified theoretical framework that integrates coordinate transformation with scattering cancellation, we demonstrate this concept both numerically and experimentally in thermal sensors, cloaks, and concentrators. The required shell's anisotropic thermal conductivity is realized using deep-learning-optimized microstructures. This approach establishes a general paradigm for designing truly noninvasive devices in diffusion-based systems, with promising extensions to wave phenomena such as acoustics and electromagnetics.
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Universal Precision Limits in General Open Quantum Systems.

Van Vu T, Honma R, Saito K

Phys Rev Lett · 2026 May · PMID 42213954 · Publisher ↗

The intuition that the precision of observables is constrained by thermodynamic costs has recently been formalized through thermodynamic and kinetic uncertainty relations. While such trade-offs have been extensively stud... The intuition that the precision of observables is constrained by thermodynamic costs has recently been formalized through thermodynamic and kinetic uncertainty relations. While such trade-offs have been extensively studied in Markovian systems, corresponding constraints in the non-Markovian regime remain largely unexplored. In this Letter, we derive universal bounds on the precision of generic observables in open quantum systems that interact with their environments at arbitrary coupling strengths and are subjected to two-point measurements. By introducing an asymmetry term that quantifies the disparity between forward and backward processes, we show that the relative fluctuation of any time-antisymmetric current is constrained not only by entropy production but also by this asymmetry. For general observables, we further prove that their relative fluctuation is always bounded from below by a generalized activity term that characterizes environmental changes. These results establish a comprehensive framework for understanding the fundamental limits of precision in a broad class of open quantum systems, beyond the traditional Markovian setting.
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Nonlocal Response in Arrays of Nanoscale Metallic Islands: Fractionalized Entropy and Anomalous Heat Transport.

Hurvitz N, Finkelstein G, Sela E

Phys Rev Lett · 2026 May · PMID 42213953 · Publisher ↗

The surprisingly rich physics of a single Coulomb-blockaded metallic island coupled to quantum Hall edge channels is now well established, giving rise to exotic quantum impurity states. Here, we show that qualitatively n... The surprisingly rich physics of a single Coulomb-blockaded metallic island coupled to quantum Hall edge channels is now well established, giving rise to exotic quantum impurity states. Here, we show that qualitatively new physics emerges in arrays of such elements. Universal and robust behavior emerges for energy scales smaller than the charging energy of the islands. We consider a chain of N metallic islands and find that it displays nonlocal responses. In particular, we demonstrate that for the bulk filling factor of ν=1, the islands could support a finite heat flow without a temperature difference between them. Upon pinching the array with a quantum point contact, we predict an entropy change that scales with the number of islands as ΔS=1/2k_{B}log(N+1).
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Breakdown of the Wiedemann-Franz Law in an Interacting Quantum Hall Metamaterial.

Roche P, Altimiras C, Parmentier FD … +1 more , Maillet O

Phys Rev Lett · 2026 May · PMID 42213952 · Publisher ↗

Coulomb interactions deeply affect quantum transport in simple ballistic systems, but their impact on scaled up ballistic structures remains underexplored. Here, we theoretically consider a chain of small metallic dots w... Coulomb interactions deeply affect quantum transport in simple ballistic systems, but their impact on scaled up ballistic structures remains underexplored. Here, we theoretically consider a chain of small metallic dots with frozen charge dynamics connected by ballistic channels. We identify a neutral mode of transport that is specific to a chain with at least two islands and entwines local diffusion by neutral excitations with long-range correlations between the islands' charge states. We show, as an experimentally measurable signature of this many-body behavior, that the Wiedemann-Franz law is violated with a Lorenz ratio scaling as the square root of the chain's length.
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