Physics

  • Article
    | Open Access

    MnBi2Te4 and Bi2Te3 can form natural superlattices, where the MnBi2Te4 layers are separated by multiples of Bi2Te3. The combination of these two materials offers a potential platform for the interplay of tunable magnetism and topology. Here, the authors show that MnBi4Te7 and MnBi6Te10 display a complex magnetic ground state with coexisting ferromagnetic and antiferromagnetic domains.

    • Xiaolong Xu
    • , Shiqi Yang
    •  & Yu Ye
  • Article
    | Open Access

    Renormalisation group methods serve for finding analytic solutions, critical points and computing phase diagrams of many-body systems. Here the authors demonstrate that renormalisation group schemes can be constructed for undecidable many-body systems, giving rise to the types of renormalisation group flow which are strictly more unpredictable than chaotic flows.

    • James D. Watson
    • , Emilio Onorati
    •  & Toby S. Cubitt
  • Article
    | Open Access

    ‘Giant atom’ physics occurs when the size of the atomic system becomes comparable to the wavelength of the light it interacts with. For atoms, such a regime is impossible to reach, however, for artificial atomic systems such ‘giant atom’ physics can be explored. Here, Wang et al demonstrate giant spin ensembles, consisting of magnetic spheres coupled to a microwave waveguide.

    • Zi-Qi Wang
    • , Yi-Pu Wang
    •  & J. Q. You
  • Article
    | Open Access

    Interaction-free measurements typically use repeated interrogations of an object that suppress the coherent evolution of the system. Dogra et al. demonstrate in a superconducting circuit a novel protocol that employs coherent repeated interrogations, and show that it yields a higher detection probability.

    • Shruti Dogra
    • , John J. McCord
    •  & Gheorghe Sorin Paraoanu
  • Article
    | Open Access

    The existing paradigms of system-bath control typically assume that the bath state is unchanged. By using spin defects in diamond, Dasari et al. demonstrate a scheme for controlling the state of the nuclear spin bath via selective measurements of the central qubit as a way of extending the qubit coherence time.

    • Durga Bhaktavatsala Rao Dasari
    • , Sen Yang
    •  & Jörg Wrachtrup
  • Article
    | Open Access

    Lattice anchoring, in its varied forms, has proven effective at regulating the energetics of metastable phases of polymorphic crystals. Here, the authors utilize top-down photolithography to embed a tessellating 3D interfacial network into otherwise-unstable CsPbI3 perovskite thin films and devices, stabilizing the perovskite phase.

    • Julian A. Steele
    • , Tom Braeckevelt
    •  & Maarten B. J. Roeffaers
  • Article
    | Open Access

    It is unclear what constraints exist on cellular life in frigid environments. Here, the authors demonstrate that reactive oxygen species and gene-expression speed impose a barrier to replication at low temperatures in yeast, with lower levels enabling quicker replication, and develop a model to describe this phenomenon.

    • Diederik S. Laman Trip
    • , Théo Maire
    •  & Hyun Youk
  • Article
    | Open Access

    Qutrits, or quantum three-level systems, can provide advantages over qubits in certain quantum information applications, and high-fidelity single-qutrit gates have been demonstrated. Goss et al. realize high-fidelity entangling gates between two superconducting qutrits that are universal for ternary computation.

    • Noah Goss
    • , Alexis Morvan
    •  & Irfan Siddiqi
  • Article
    | Open Access

    Getting a grip on the chaotic properties of quantum systems is difficult. Now, the effect of translational invariance in space in time in an ensemble of random quantum circuits is shown to lead to largely universal scaling laws describing the system without the need of knowing microscopic details.

    • Amos Chan
    • , Saumya Shivam
    •  & Andrea De Luca
  • Article
    | Open Access

    Object detection using machine learning universally requires vast amounts of training datasets. Midtvedt et al. proposes a deep-learning method that enables detecting microscopic objects with sub-pixel accuracy from a single unlabeled image by exploiting the roto-translational symmetries of the problem.

    • Benjamin Midtvedt
    • , Jesús Pineda
    •  & Giovanni Volpe
  • Article
    | Open Access

    Recent experiments have revealed a metal-insulator transition in a moire bilayer at band filling away from the strongly-correlated regime, which has rarely been addressed. Here the authors develop a theory that provides a complete understanding of experimental features in terms of a disorder-driven transition.

    • Yuting Tan
    • , Pak Ki Henry Tsang
    •  & Vladimir Dobrosavljević
  • Article
    | Open Access

    Experimentally following the ultrafast dynamics of microsolvated molecules is challenging due to the inherently produced soup mix of various gas-phase aggregates. Here, the authors exploit neutral-species selection to reveal intimate details of the UV-induced ultrafast dynamics in the prototypical indole-water system.

    • Jolijn Onvlee
    • , Sebastian Trippel
    •  & Jochen Küpper
  • Article
    | Open Access

    Here the authors introduce dual communities, characterized by strong connections at their boundaries, and show that they are formed as a trade-off between efficiency and resilience in supply networks.

    • Franz Kaiser
    • , Philipp C. Böttcher
    •  & Dirk Witthaut
  • Article
    | Open Access

    Quantum simulators allow for experimental studies of many-body systems in complex geometries, which has rarely been addressed by theory. Here the authors study many-body Hamiltonians on generic random graphs and show that many-body effects emerge only in a small class of exceptional, highly structured graphs.

    • Joseph Tindall
    • , Amy Searle
    •  & Dieter Jaksch
  • Article
    | Open Access

    Tanner’s law describes the spreading dynamics of droplets made of Newtonian viscous fluids. Here, the authors demonstrate that this law remains valid for phase-separated binary liquids close to their critical point, and thus for all the associated universality class.

    • Raphael Saiseau
    • , Christian Pedersen
    •  & Jean-Pierre Delville
  • Article
    | Open Access

    Non-equilibrium quantum many-body systems undergoing repeated measurements exhibit phase transitions in their entanglement properties. Here the authors use a superconducting quantum simulator to demonstrate an entanglement phase transition that can be mapped to a vitrification transition in the spin glass theory.

    • Jeremy Côté
    •  & Stefanos Kourtis
  • Article
    | Open Access

    The ultra-quantum limit refers to the high magnetic-field regime where electrons are confined to the lowest Landau level and is most easily reached in topological semimetals due to their low carrier density. Here, the authors study this regime in the Dirac semimetal ZrTe5 and find evidence for a Lifshitz transition at moderate field, leading to the emergence of a 1D-Weyl band structure at high field.

    • S. Galeski
    • , H. F. Legg
    •  & J. Gooth
  • Article
    | Open Access

    Here the authors experimentally demonstrate a maximally charged Weyl point in a three dimensional photonic crystal, with topological charge of four — the maximal charge number that a two-fold Weyl point can host, which supports quadruple-helicoid Fermi arcs

    • Qiaolu Chen
    • , Fujia Chen
    •  & Yihao Yang
  • Article
    | Open Access

    Here the authors, by using data from three electrical companies in the USA, find that the recovery duration of an outage is connected with the downtime of its nearby outages and blackout intensity and present a cluster-based recovery framework.

    • Hao Wu
    • , Xiangyi Meng
    •  & Albert-László Barabási
  • Article
    | Open Access

    An intrinsic antiferromagnetic skyrmion is located entirely within a single atomic layer, rather than two coupled layers. Here, the authors predict the existence of intrinsic antiferromagnetic skyrmions in a chromium monolayer deposited on a PdFe/Ir(111) substrate, which can form interlinked chain structures.

    • Amal Aldarawsheh
    • , Imara Lima Fernandes
    •  & Samir Lounis
  • Article
    | Open Access

    Exotic spin-dependent force are among the possible extensions of the Standard Model that can be probed by precision measurements. Here, the authors use a spin-exchange-relaxation free (SERF) K-Rb-21Ne comagnetometer to improve limits on spin- and velocity dependent forces.

    • Kai Wei
    • , Wei Ji
    •  & Dmitry Budker
  • Article
    | Open Access

    Lead halide perovskites have recently emerged as a promising platform for the study of polariton superfluidity at room temperature. Here the authors report a complete set of quantum fluid phase transitions in both 1D and 2D homogeneous single crystals of CsPbBr3.

    • Kai Peng
    • , Renjie Tao
    •  & Wei Bao
  • Article
    | Open Access

    Traditional methods for cell stiffness measurements are limited by long processing times and unsuitability for multiple cell analysis. Here, the authors demonstrate a fast technique based on acoustic stimulation and holographic imaging to reconstruct whole-cell stiffness maps of individual and multiple cells.

    • Rahmetullah Varol
    • , Zeynep Karavelioglu
    •  & Huseyin Uvet
  • Article
    | Open Access

    The application of rolling motion to microswarm navigation and cargo delivery has been constrained by the need for a physical boundary to roll along to date. Here, Zhang et al. solve this problem by introducing a reconfigurable virtual wall implemented by a combination of magnetic and acoustic fields.

    • Zhiyuan Zhang
    • , Alexander Sukhov
    •  & Daniel Ahmed
  • Article
    | Open Access

    In flat band materials, the ’flat’ dispersion of the electronic states mean that interactions between electrons can be strong, potentially leading to a variety of interesting magnetic and transport properties. Here, Nag et al study the Kagomé semimetal Co3Sn2S2, and show a nearly flat Stoner excitation dispersion, a clear indication of spin-polarized and flat electronic bands.

    • Abhishek Nag
    • , Yiran Peng
    •  & Ke-Jin Zhou
  • Article
    | Open Access

    Breaking of Lorentz symmetry is related to the unification of fundamental forces and the extension of the standard model. Here the authors provide updated bounds on the Lorentz violation, by using measurements with trapped Yb+ ion, that represent an improvement over existing results.

    • Laura S. Dreissen
    • , Chih-Han Yeh
    •  & Tanja E. Mehlstäubler
  • Article
    | Open Access

    The manifold’s geometry underlying the connectivity of a complex network determines its navigation ruled by the nodes distances in the geometrical space. In this work, the authors propose an algorithm which allows to uncover the relation between the measures of geometrical congruency and efficient greedy navigability in complex networks.

    • Carlo Vittorio Cannistraci
    •  & Alessandro Muscoloni
  • Article
    | Open Access

    The recent discovery of novel charge density wave (CDW) and pair density wave (PDW) in kagome superconductors (SC) AV3Sb5 motivates theoretical study of these phenomena. Here, the authors propose that the CDW state is an orbital Chern metal, leading to a SC state with a chiral PDW, the melting of which leads to vestigial electronic orders including charge-4e and 6e SC.

    • Sen Zhou
    •  & Ziqiang Wang
  • Article
    | Open Access

    A unified picture of the electronic relaxation dynamics of ionized liquid water remains elusive despite decades of study. Here, the authors use few-cycle optical pump-probe spectroscopy and ab initio quantum dynamics to unambiguously identify a new transient intermediate in the relaxation pathway.

    • Pei Jiang Low
    • , Weibin Chu
    •  & Zhi-Heng Loh
  • Article
    | Open Access

    Spin simulators can solve many combinatorial optimization problems that can be represented by spin models, but they are limited to low-dimensional spins. Here the authors propose a simulator of multidimensional spins in arbitrary dimension, using a system of coupled parametric oscillators with a common pump.

    • Marcello Calvanese Strinati
    •  & Claudio Conti
  • Article
    | Open Access

    Networks with higher-order interactions are known to provide better representation of real networked systems. Here the authors introduce a framework based on statistical inference to detect overlapping communities and predict hyperedges of any size in hypergraphs.

    • Martina Contisciani
    • , Federico Battiston
    •  & Caterina De Bacco
  • Article
    | Open Access

    Here the authors report the development of a topological nonlinear parametric amplification in a dimerized, Su-Schrieffer-Heeger waveguide. Kerr-induced chiral symmetry breaking is demonstrated, showcasing how nonlinearities may control transitions of topological modes to bulk states.

    • Byoung-Uk Sohn
    • , Yue-Xin Huang
    •  & Dawn T. H. Tan
  • Article
    | Open Access

    Adding prior experimentally or theoretically obtained knowledge to the training of recurrent neural networks may be challenging due to their feedback nature with arbitrarily long memories. The authors propose a path sampling approach that allows to include generic thermodynamic or kinetic constraints for learning of time series relevant to molecular dynamics and quantum systems.

    • Sun-Ting Tsai
    • , Eric Fields
    •  & Pratyush Tiwary
  • Article
    | Open Access

    Quasiparticles, or broken Cooper pairs, are a major source of decoherence in superconducting qubits but their origin is debated. Pan et al. confirm the dominant mechanism due to photon absorption in the Josephson junction and demonstrate mitigation strategies based on tuning of the qubit geometry.

    • Xianchuang Pan
    • , Yuxuan Zhou
    •  & Dapeng Yu
  • Article
    | Open Access

    Halo-structured nuclei are examples of many-body open quantum system. Here the authors use a complete kinematics measurement and find an elastic breakup of proton halo nucleus 8B.

    • L. Yang
    • , C. J. Lin
    •  & F. P. Zhong
  • Article
    | Open Access

    Future optical devices, e.g., for AR and VR, will require sophisticated flat metaoptics with unique optical functionalities. The authors demonstrate a metaobjective based on electrically switchable metallic polymer metalenses, whose optical states and focal length is adjustable via CMOS compatible voltages.

    • Julian Karst
    • , Yohan Lee
    •  & Harald Giessen
  • Article
    | Open Access

    Clear electronic transport signatures of topological nodal-line semimetals have been lacking due to their complex electronic structure and the presence of topologically trivial states. Kim et al. demonstrate that the quantum transport response in slightly hole-doped SrAs3 is dominated by nodal-line fermions.

    • Hoil Kim
    • , Jong Mok Ok
    •  & Jun Sung Kim
  • Article
    | Open Access

    The authors demonstrate on-the-fly reconfigurable optical trapping of organic polariton condensates which are delocalised over a macroscopic distance from the excitation region, holding great potential for future work on polaritonic lattice physics.

    • Mengjie Wei
    • , Wouter Verstraelen
    •  & Hamid Ohadi
  • Article
    | Open Access

    High thermal conductivity electronic materials are critical for next-generation electronics and photonics. Here, the authors report isotropic high thermal conductivity of 3C-SiC wafers exceeding 500 W m−1K−1.

    • Zhe Cheng
    • , Jianbo Liang
    •  & David G. Cahill
  • Article
    | Open Access

    X-ray photoelectron spectroscopy probes the chemical environment in a molecule at a specific atomic site. Here the authors extend this concept with a site selective trigger to follow chemical bond changes as they occur on the femtosecond time scale.

    • Andre Al-Haddad
    • , Solène Oberli
    •  & Christoph Bostedt