PERSPECTIVE
Reversible to irreversible (R-IR) transitions have been found in a wide variety of both soft and hard matter periodically driven collectively interacting systems that, after a certain number of driving cycles, organize into either a reversible state where the particle trajectories repeat during every or every few cycles or into a chaotic motion state. An overview of R-IR transitions including recent advances in the field is followed by a discussion of how the general framework of R-IR transitions could be applied to a much broader class of nonequilibrium systems in which periodic driving occurs, including not only soft and hard condensed matter systems, but also astrophysics, biological systems, and social systems.
C. Reichhardt et al.
Phys. Rev. Research 5, 021001 (2023)
LETTER
The incommensurate magnetic spin textures within centrosymmetric single-crystal EuGaAl are studied using resonant elastic x-ray scattering with full linear polarization analysis under no applied magnetic field. The findings unambiguously demonstrate a transition from a transverse spin density wave into a noncollinear elliptically modulated helical ground state with a large coexistence regime.
M. T. Littlehales et al.
Phys. Rev. Research 6, L032015 (2024)
EDITORS' SUGGESTION
How the nonlinear dynamics of a self-propelling biomolecular condensate can be reduced to an incompressible linear system reminiscent of fluid mechanics is demonstrated. Using this framework, the criteria is interrogated to observe condensate dynamics.
Andriy Goychuk, Leonardo Demarchi, Ivan Maryshev, and Erwin Frey
Phys. Rev. Research 6, 033082 (2024)
LETTER
A thermal heterojunction with two inverted, kinetically constrained models is established, demonstrating the manipulation of entanglement flows and its relation with quantum thermodynamics.
Guanhua Chen and Yao Yao
Phys. Rev. Research 6, L032014 (2024)
EDITORS' SUGGESTION
The degree of itineracy, given by the charge correlation functions and the weights of 5 configurations contributing to the intermediate valence ground state in intermetallic U compounds are provided by DFT + DMFT calculations based on energy-dependent photoemission data. This combination yields reliable values for the double counting correction , Hubbard , and Coulomb , thereby enabling a reliable description of this class of compounds.
Andrea Marino et al.
Phys. Rev. Research 6, 033068 (2024)
EDITORS' SUGGESTION
An extra dimension is found to connect topological superconductors to Weyl semimetals.
Fabian G. Medina Cuy, Francesco Buccheri, and Fabrizio Dolcini
Phys. Rev. Research 6, 033060 (2024)
LETTER
Coherent emission of a cold relativistic electron bunch passing through a counterpropagating strong laser pulse substantially modifies the radiation spectrum and enhances its low-frequency part by orders of magnitude. The derived analytical estimates are confirmed by 3D particle-in-cell simulations.
E. G. Gelfer, A. M. Fedotov, O. Klimo, and S. Weber
Phys. Rev. Research 6, L032013 (2024)
LETTER
This article shows a quantum phase transition in a quasi-one-dimensional zigzag-chain Ising antiferromagnet CaCoVO with a nontrivial exponent 1/6 that results from the onset of spin-orbit coupling and the competing exchange interactions and of the zigzag spin chain.
Isha et al.
Phys. Rev. Research 6, L032010 (2024)
LETTER
A topologically stable line defect, called a skyrme line, is shown to exist in ferroelectric materials. Unusually, their topological charge can fractionalize. The properties, creation, and stability of these fractional defects are studied.
Chris Halcrow and Egor Babaev
Phys. Rev. Research 6, L032011 (2024)
LETTER
A study explores the shepherding control problem, where one complex multiagent system (the herders) controls the collective dynamics of another complex multiagent system (the targets). The findings reveal that for noncohesive targets and herders with limited sensing capability, there exists a critical density threshold for the targets below which shepherding becomes significantly more challenging. This phenomenon is explained through the percolation of a suitably defined “herdability” graph.
Andrea Lama and Mario di Bernardo
Phys. Rev. Research 6, L032012 (2024)
LETTER
A reinforcement learning-based method is introduced that adaptively determines the optimal playing sequence in Parrondo’s games, enhancing profit outcomes.
Kang Hao Cheong and Jie Zhao
Phys. Rev. Research 6, L032009 (2024)
LETTER
High-field magnetotransport and Hall effect measurements on the van der Waals ferromagnet FeGeTe reveals a dramatic change in the quasiparticle character below 80 K and indicate electronmagnon scattering with an atypical temperature dependence, supporting the presence of Kondo-lattice behavior in this -electron system.
S. Vaidya et al.
Phys. Rev. Research 6, L032008 (2024)
LETTER
Transfer entropy is the primary method for determining the information flow from a driver to a target time series. A study shows how it can be decomposed into pure two-body effects and higher-order ones, the latter consisting of information shared with the driver with the rest of the environment, which can be synergistic or redundant. An application to El Niño and the Southern Oscillation is presented.
Sebastiano Stramaglia, Luca Faes, Jesus M. Cortes, and Daniele Marinazzo
Phys. Rev. Research 6, L032007 (2024)
LETTER
The anticipated chiral-magnetic-effect (CME)-related charge separation was not measured to be larger in Ru + Ru than in Zr + Zr collisions because the flow-induced backgrounds do not fully cancel due to nuclear structure differences between the two isobar nuclei. Properly taking this, as well as the next-level nonflow-related backgrounds, into account, the charge separation results are consistent between the isobar systems, and an upper limit of 10% of the CME signal is extracted at a 95% confidence level.
M. I. Abdulhamid et al. (STAR Collaboration)
Phys. Rev. Research 6, L032005 (2024)
LETTER
The weakly nonlinear regime of a one-dimensional photon superfluid is characterized by the emergence of bound Bogoliubov quasiparticles, secondary collective excitations originating from nonresonant interactions between Bogoliubov modes. These processes, which are revealed by a structure of additional branches in the dispersion relation, do not depend on the specific superfluid under consideration but are inherent in the nonlinear dynamics of collective excitations.
Marzena Ciszak and Francesco Marino
Phys. Rev. Research 6, L032006 (2024)
LETTER
A machine-learning-based quantum error-correction decoder is trained and implemented on IBM quantum hardware through cloud access, demonstrating the capability to accurately decode complex errors on experimental devices.
Brhyeton Hall, Spiro Gicev, and Muhammad Usman
Phys. Rev. Research 6, L032004 (2024)
LETTER
Universality is at the heart of an equilibrium phase transition. This article unveils the emergence of universal quantum critical behavior in quench dynamics.
Sanku Paul, Paraj Titum, and Mohammad Maghrebi
Phys. Rev. Research 6, L032003 (2024)
LETTER
An inherent pairing ratio in spontaneous four-wave mixing within an atomic ensemble represents the ratio of temporally correlated biphotons generated through stimulated four-wave mixing to total scattered photons in a specific direction. The experiment demonstrates ultrabright biphoton generation and shows that this pairing ratio improves with increased atomic ensemble density.
Jiun-Shiuan Shiu et al.
Phys. Rev. Research 6, L032001 (2024)
LETTER
Polar activity is shown to induce a progressive local deformation of linear polymer chains, making a clear distinction between head and tail, while the overall chain conformation becomes more compact.
Andrés R. Tejedor, Jorge Ramírez, and Marisol Ripoll
Phys. Rev. Research 6, L032002 (2024)
LETTER
A universal set of microwave-driven quantum gates is implemented on a two-qubit trapped-ion quantum register, and the ability to carry out arbitrary circuits is demonstrated using the cycle benchmarking protocol. The structure can serve as a universal quantum computation register for the quantum CCD architecture of the trapped-ion quantum computer.
N. Pulido-Mateo et al.
Phys. Rev. Research 6, L022067 (2024)
LETTER
Nuclear motion is responsible for a significant increase of the two-photon ionization delays in molecules due to the temporal confinement of the ejected electron between two nuclei.
Adrián J. Suñer-Rubio et al.
Phys. Rev. Research 6, L022066 (2024)
EDITORS' SUGGESTION
A study examines directional light-matter interaction within quantum-dot embedded, topological photonic crystal waveguides, comparing their performance to conventional line defect waveguides. The findings indicate that topological waveguides exhibit weaker directional coupling, even with the application of state-of-the-art inverse design methods.
N. J. Martin et al.
Phys. Rev. Research 6, L022065 (2024)
EDITORS' SUGGESTION
The transition from edge-dominated to bulk-dominated quantum interference patterns of supercurrents in a quantum anomalous Hall-based Josephson junction is investigated. An anomalous Fraunhofer-like pattern is observed due to the bulk carriers induced by magnetic domains, even when the chemical potential resides within the bulk gap.
Junjie Qi et al.
Phys. Rev. Research 6, 023293 (2024)
LETTER
Learning the multiscale structural complexity can unveil off-diagonal long-range order solely through experimentally available descriptors.
Bo Xiao et al.
Phys. Rev. Research 6, L022064 (2024)
LETTER
The calibration-control dilemma is addressed in unstable dynamical systems where control distorts the determination of the parameters that are needed for control implementation, leading to large, unwanted fluctuations. By integrating parameter calibration and control within a data assimilation framework, the proposed method achieves performance comparable to systems with fully known parameters, allowing control of most complex systems for which equations or parameters are unknown.
Virgile Troude, Sandro Claudio Lera, and Didier Sornette
Phys. Rev. Research 6, L022063 (2024)
LETTER
Buckling instabilities can be seen in systems ranging from biological flagella to cables dropped to the ocean floor: the coiling of a dropped chain or a falling jet of honey are familiar examples. A chain of sticky bubbles is presented that rise due to buoyancy and buckle due to hydrodynamic effects.
Carmen L. Lee and Kari Dalnoki-Veress
Phys. Rev. Research 6, L022062 (2024)
LETTER
A protocol to reliably demonstrate Kondo behavior in tunneling spectroscopy is presented, employing a Hurwitz line shape to correctly describe the Fermi-Dirac-broadened Kondo peak, as well as a recently derived equation for the intrinsic temperature dependence of the Kondo resonance.
Elia Turco et al.
Phys. Rev. Research 6, L022061 (2024)
LETTER
A concept for a staggered array undulator that can be constructed using bulk high-temperature superconductors and magnetized with pulsed field magnetization.
Dian Weerakonda, Anthony Dennis, Marco Calvi, and John Durrell
Phys. Rev. Research 6, L022060 (2024)
LETTER
A scalable Floquet scheme for the quantum simulation of the real-time dynamics in a ℤ lattice gauge theory is proposed, considering periodically driven arrays of Rydberg atoms in a tweezer-ladder geometry. The observation of gauge-invariant confinement dynamics is demonstrated to be in reach of current experimental techniques.
Enrico C. Domanti, Dario Zappalà, Alejandro Bermudez, and Luigi Amico
Phys. Rev. Research 6, L022059 (2024)
LETTER
In low-disorder samples, bulk quasiparticles of the = 1 integer quantum Hall state are either randomly localized or ordered on a Wigner lattice. It is found that thermal activation energy has a dramatic behavior with the quasiparticle density, exhibiting conspicuous local minima at the crossover from the randomly localized phase to the Wigner solid.
S. A. Myers et al.
Phys. Rev. Research 6, L022056 (2024)
LETTER
Stochastic thermodynamics has unveiled several universal trade-off relations, but they do not have to be restricted to mesoscopic systems. The geometric structure of the thermodynamic forces in hydrodynamics reveals the similarity between stochastic thermodynamics and hydrodynamics and helps generalize the housekeeping–excess decomposition of entropy production and derive an inequality that resembles the thermodynamic uncertainty relations.
Kohei Yoshimura and Sosuke Ito
Phys. Rev. Research 6, L022057 (2024)
LETTER
The many-body effects arising when coupling whispering gallery electronic (cavity) modes to a double-dot system are investigated. Conventional Kondo effects, where the dots hybridize with their leads, compete with a cavity-mediated dot-dot hybridization, engendering an exotic shuttling of Kondo screening between the leads and the formation of a Kondo-cat state.
Lidia Stocker and Oded Zilberberg
Phys. Rev. Research 6, L022058 (2024)
LETTER
Dislocations are explored as possible components of solid-state quantum devices. Their strain induces the creation of self-assembled arrays of defect-based qubits.
Daniel Barragan-Yani and Ludger Wirtz
Phys. Rev. Research 6, L022055 (2024)
LETTER
Many-body localization is studied in a model where the interaction seems to enhance the localization rather than reduce it. A mean-field theory is proposed to provide an accurate and intuitive understanding of the mechanism behind the enhancement.
Ke Huang, DinhDuy Vu, Sankar Das Sarma, and Xiao Li
Phys. Rev. Research 6, L022054 (2024)
LETTER
The superfluid stiffness and the Josephson quantum capacitance of chiral-symmetric superconducting Dirac semimetals are shown to become quantized in nonuniversal units due to nontrivial topology. The topological constraint imposed on the total superfluid stiffness further leads to the here-termed quantum admittance effect, that is, the universal topological quantization of the admittance modulus when the system is subject to an ac perturbation with a frequency tuned at the absorption edge.
Jun-Ang Wang, Mohamed Assili, and Panagiotis Kotetes
Phys. Rev. Research 6, L022053 (2024)