Article
Multidisciplinary Sciences
Mengjie Wei, Wouter Verstraelen, Konstantinos Orfanakis, Arvydas Ruseckas, Timothy C. H. Liew, Ifor D. W. Samuel, Graham A. Turnbull, Hamid Ohadi
Summary: The authors demonstrate the on-the-fly reconfigurable optical trapping of organic polariton condensates, which are delocalized over a macroscopic distance from the excitation region. This study holds great potential for future research on polaritonic lattice physics.
NATURE COMMUNICATIONS
(2022)
Article
Physics, Multidisciplinary
Wei Wen, Shanhua Zhu, Yi Xie, Baoquan Ou, Wei Wu, Pingxing Chen, Ming Gong, Guangcan Guo
Summary: In this study, a generalized Kibble-Zurek (KZ) mechanism for defect formation in trapped ions is proposed, which takes into account the frozen correlation length of a kink in an inhomogeneous system and shows a smooth crossover from fast to slow quenching processes. The theoretical model is confirmed through molecular dynamics simulation, showing excellent agreement with experimental results.
SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
(2023)
Article
Physics, Multidisciplinary
Pierre Naze, Marcus V. S. Bonanca, Sebastian Deffner
Summary: This study demonstrates the consistency of the Kibble-Zurek mechanism and linear response theory in describing quantum phase transitions. Linear response theory can provide arguments for the Kibble-Zurek mechanism, and the excess work calculated from linear response theory exhibits Kibble-Zurek scaling.
Article
Optics
A. D. Garcia-Orozco, L. Madeira, M. A. Moreno-Armijos, A. R. Fritsch, P. E. S. Tavares, P. C. M. Castilho, A. Cidrim, G. Roati, V. S. Bagnato
Summary: We studied the emergence of universal scaling in the time-evolving momentum distribution of a harmonically trapped three-dimensional Bose-Einstein condensate, which was parametrically driven to a turbulent state. We found that the out-of-equilibrium dynamics post excitation can be described by a single function due to nearby nonthermal fixed points. The observed behavior connects the dynamics of a quantum turbulent state to several far-from-equilibrium phenomena.
Article
Optics
Tenzin Rabga, Yangheon Lee, Dalmin Bae, Myeonghyeon Kim, Y. Shin
Summary: We study the vortex nucleation dynamics in inhomogeneous atomic Bose gases quenched into a superfluid phase and investigate the dependence of the Kibble-Zurek (KZ) scaling exponent on the trap configuration. We observe the characteristic power-law scaling of the vortex number with the quench rate and enhanced vortex suppression in the outer regions, in agreement with the inhomogeneous Kibble-Zurek mechanism. However, the measured KZ scaling exponents deviate from the theoretical estimates and their trends as a function of the trap configuration are different from the prediction. Our study highlights the importance of a refined theoretical framework for understanding phase transition and defect formation in such inhomogeneous systems.
Article
Materials Science, Multidisciplinary
Krishanu Roychowdhury, Roderich Moessner, Arnab Das
Summary: Kibble-Zurek theory provides a robust framework for defect generation during phase transitions, but falls short in predicting the correlation dynamics between defects. In the case of a quantum Ising chain, the actual decay in domain wall correlations follows a Gaussian spatial pattern instead of the exponential decay predicted by KZ. Our proposal introduces a framework based on quantum coarsening dynamics to extend beyond KZ and address generic interacting situations.
Article
Multidisciplinary Sciences
Juan Carlos Sandoval-Santana, Roberto Zamora-Zamora, Rosario Paredes, Victor Romero-Rochin
Summary: This study focuses on decoherence and recurrences in the dynamics of the one-body density matrix of an F=1 spinor Bose-Einstein condensate, revealing accurate analytical expressions for the time dependence of coherent states. The research also uncovers the relationship between decoherence and recurrence times with the number of atoms and strength parameters, showing significant differences based on the strength of spin-spin interactions.
Article
Physics, Multidisciplinary
Hua-Bi Zeng, Chuan-Yin Xia, Adolfo del Campo
Summary: The crossing of a continuous phase transition leads to the formation of topological defects, which is described by the Kibble-Zurek mechanism (KZM) in slow quenches. KZM predicts a universal power-law scaling for the defect density and the quench time. Deviations from KZM in rapid quenches have been experimentally observed and their universality has been established. The defect density and freeze-out time become independent of the quench rate and show a universal power-law scaling with the final value of the control parameter.
PHYSICAL REVIEW LETTERS
(2023)
Article
Physics, Condensed Matter
S. K. Adhikari
Summary: This study investigates supersolid-like states in a quasi-two-dimensional trapped Rashba and Dresselhaus spin-orbit coupled spin-1 condensate. Different types of states are formed depending on the strength of spin-orbit coupling, including superlattice/superstripe states and multi-ring states. These states are found to be dynamically stable and will contribute to a better understanding of crystallization in solids.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2021)
Article
Materials Science, Multidisciplinary
D. D. Solnyshkov, L. Bessonart, A. Nalitov, G. Malpuech
Summary: The study reveals that the formation of topological defects during the formation of a two-dimensional polariton condensate can be influenced by lattice modifications and result in a scaling exponent of 0.95. Additionally, the observation that vortices can be pinned to the lattice could facilitate their observation and counting in continuous wave experiments.
Article
Physics, Multidisciplinary
S. Baryshev, A. Zasedatelev, H. Sigurdsson, I Gnusov, J. D. Topfer, A. Askitopoulos, P. G. Lagoudakis
Summary: In this study, we conducted full polarization tomography on photon correlations in a spinor exciton-polariton condensate. Our measurements demonstrate the different forms of condensate pseudospin mean-field dynamics and their intrinsic relation to the condensate photon statistics.
PHYSICAL REVIEW LETTERS
(2022)
Article
Engineering, Mechanical
Emmanuel Kengne
Summary: In this study, we used the similarity transformation technique to build exact and approximate rogue wave (RW) solutions for a quasi-one-dimensional Gross-Pitaevskii equation. These solutions were applied to the study of matter rogue waves and superposed rogue waves in Bose-Einstein condensates (BECs), considering different forms of the interatomic interaction strength. The results show that the solution parameters can be used to control the formation and manipulation of first- and second-order RWs in BEC systems. Additionally, the effects of changing the parameters of the interatomic interaction strength were investigated, revealing the reduction of RWs to single solitons or multiplets. The control and free parameters in the RW solutions were found to influence the splitting of rogue wave components into multi-peak solutions. Furthermore, the linear superposition of different rogue wave solutions resulted in four types of coherent structures, which were analyzed in detail, along with the effects of solution parameters and intra-component strength.
NONLINEAR DYNAMICS
(2023)
Article
Multidisciplinary Sciences
Jayanta Bera, Abdul Q. Batin, Suranjana Ghosh, Boris Malomed, Utpal Roy
Summary: This article studies the effects of time-periodic modulation on a quasi-one-dimensional Bose-Einstein condensate with contact and long-range dipolar interactions. The modulation generates a variety of harmonics in the condensate's oscillations, including multiple and combinational harmonics. The results of approximate analytical calculations are confirmed by simulations of the underlying Gross-Pitaevskii equation.
PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
(2023)
Article
Optics
M. Miskeen Khan, H. Tercas, J. T. Mendonca, J. Wehr, C. Charalambous, M. Lewenstein, M. A. Garcia-March
Summary: The study investigates the quantum motion of an impurity atom in a Bose-Einstein condensate in arbitrary dimensions, showing superdiffusive behavior, dimension-dependent average energy, and non-Markovianity of particle motion. Trapped impurity atoms exhibit stronger position squeezing in lower dimensions.
Article
Mathematics, Interdisciplinary Applications
Mikhail N. Smolyakov
Summary: In this paper, quantization of a weakly nonideal Bose gas at zero temperature is performed along the lines of the well-known Bogolyubov approach. By introducing nonoscillation modes and calculating nonlinear corrections, the analysis successfully recovers canonical commutation relations and solves the issue of nonconserved particle number at least in the case of free quasi-particles.
CHAOS SOLITONS & FRACTALS
(2021)
Article
Physics, Multidisciplinary
Terumichi Ohashi, Yuki Kawaguchi
Summary: This study investigates the tunneling properties of quasiparticles in a dynamically unstable BEC, finding that perfect transmission occurs even when the BEC is dynamically unstable if the spin-wave mode is the NG mode. The existence of perfect reflection of a dynamically unstable mode is also demonstrated, with destructive interference between incident and reflected waves strongly suppressing the amplitude of the quasiparticle wave function. Numerical confirmation shows that perfect reflection is a generic nature of dynamically unstable modes and not related to the NG mode.
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
(2021)
Article
Physics, Multidisciplinary
Shoki Sugimoto, Ryusuke Hamazaki, Masahito Ueda
Summary: The study shows that in locally interacting quantum many-body systems, the overwhelming majority of pairs of local Hamiltonians and observables satisfy the ETH with exponentially small fluctuations. The ergodicity of the random matrix ensembles breaks down due to locality.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Multidisciplinary
Masaya Nakagawa, Norio Kawakami, Masahito Ueda
Summary: In this study, a one-dimensional dissipative Hubbard model with two-body loss is shown to be exactly solvable. By using a non-Hermitian extension of the Bethe-ansatz method, an exact eigenspectrum of a Liouvillian supemperator is obtained, revealing phenomena such as spin-charge separation and dissipative effects induced by the quantum Zeno effect. This research introduces a new class of exactly solvable Liouvillians of open quantum many-body systems, which can be experimentally tested using ultracold atoms subject to inelastic collisions.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Multidisciplinary
Kazuya Fujimoto, Ryusuke Hamazaki, Yuki Kawaguchi
Summary: The study found the presence of dynamic one-parameter scaling in the dynamics of fermions on one-dimensional disordered potentials, manifesting as changes in surface roughness and entanglement entropy. Partially localized states lead to anomalous scaling, with destructive interference resulting in unknown exponents.
PHYSICAL REVIEW LETTERS
(2021)
Article
Multidisciplinary Sciences
Tomoki Nagase, Yeong-Gi So, Hayata Yasui, Takafumi Ishida, Hiroyuki K. Yoshida, Yukio Tanaka, Koh Saitoh, Nobuyuki Ikarashi, Yuki Kawaguchi, Makoto Kuwahara, Masahiro Nagao
Summary: The experimental discovery of domain wall bimerons in chiral magnet Co-Zn-Mn(110) thin films is reported, resulting from the interplay between magnetic anisotropy and Dzyaloshinskii-Moriya interaction. These bimerons arise as local states between magnetic domains with opposite in-plane magnetization components. The results demonstrate the stabilization mechanism of domain wall bimerons and their appearance under various conditions in chiral magnets.
NATURE COMMUNICATIONS
(2021)
Article
Optics
Takumi Yoshino, Shunsuke Furukawa, Masahito Ueda
Summary: We studied binary Bose-Einstein condensates under the influence of synthetic magnetic fields with parallel or antiparallel orientations, finding that both types of fields exhibit the same vortex-lattice phase diagram. By introducing renormalized coupling constants, we showed that the low-energy excitation spectra for the two types of fields are related. The entanglement entropy analysis revealed stronger entanglement between components with intercomponent repulsion (attraction) in parallel (antiparallel) fields, in line with recent studies for a quantum (spin) Hall regime.
JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS
(2022)
Article
Physics, Multidisciplinary
Kazuya Fujimoto, Ryusuke Hamazaki, Yuki Kawaguchi
Summary: This article investigates universal dynamics related to surface growth physics in isolated quantum systems. Theoretical elucidation and numerical findings show that dissipation can drastically alter the universal particle-number-fluctuation dynamics associated with surface-roughness growth.
PHYSICAL REVIEW LETTERS
(2022)
Article
Multidisciplinary Sciences
Lennart Dabelow, Masahito Ueda
Summary: This paper presents the application and balance states of Restricted Boltzmann Machines in unsupervised machine learning, and discusses the trade-off between accuracy and efficiency.
NATURE COMMUNICATIONS
(2022)
Article
Physics, Multidisciplinary
Liu Ziyin, Masahito Ueda
Summary: We have derived a universal thermodynamic uncertainty relation (TUR) that is applicable to any observable in a general Markovian system. The generality of our result leads to two findings: (1) for any out-of-equilibrium system, both entropy production and nonstationarity are necessary to tightly bound the strength of a thermodynamic current; (2) by removing the antisymmetric constraint on observables, the TUR in physics and a fundamental inequality in theoretical finance can be unified within a single framework.
PHYSICAL REVIEW RESEARCH
(2023)
Article
Materials Science, Multidisciplinary
Koki Maeno, Yuki Kawaguchi, Yasuhiro Asano, Shingo Kobayashi
Summary: In this study, the superconducting gap structure of nonunitary odd-parity chiral pairing states in a superconductor involving strong spin-orbit interactions is investigated. The researchers classified all possible point-nodal gap structures in nonunitary chiral states into four types based on the topological number of nodes and node positions relative to the rotation axis. They also identified a unique type of Dirac point nodes in nonunitary chiral superconducting states. The implications of these results for UTe2, a nonunitary odd-parity superconductor, are discussed.
Article
Materials Science, Multidisciplinary
Kohei Kawabata, Masahito Ueda
Summary: The Landauer formula has been extended to the nonlinear-response regime, revealing that the nonlinear conductance is given by derivatives with respect to energy. This sensitivity to energy derivatives produces unique nonlinear transport phenomena in mesoscopic systems, such as disordered and topological materials. The study also explores the nonlinear conductance of disordered chains and the critical behavior of nonlinear response near mobility edges, as well as the nonlinear response of graphene and the scattering theory of the nonlinear Hall effect.
Article
Materials Science, Multidisciplinary
Mai Kameda, Rio Koyama, Takuro Nakajima, Yuki Kawaguchi
Summary: The study focused on interskyrmion interactions and stable spin configurations in a two-dimensional chiral magnet, analyzing the effects of tilted magnetic field and magnetocrystalline anisotropy on skyrmions. Analytical and micromagnetic calculations revealed that a slight deformation of skyrmion shape can lead to anisotropic and weakly attractive interskyrmion interactions. The direction of an external magnetic field can control the formation of magnetic domains between skyrmions, affecting their alignment in the skyrmion crystal phase.
Article
Physics, Multidisciplinary
Yuya Imaeda, Kazuya Fujimoto, Yuki Kawaguchi
Summary: This study theoretically investigates the resonant phenomenon in a spin-1 Bose-Einstein condensate under periodic driving, beyond the single-mode approximation used in previous work. It was found that resonant dynamics can occur even with nonuniform excitation, and numerical solutions revealed that nonresonant hydrodynamic variables also grow due to the nonlinear effect at wavelengths of even multiples of the resonant one.
PHYSICAL REVIEW RESEARCH
(2021)
Article
Optics
Takumi Yoshino, Shunsuke Furukawa, Masahito Ueda
Summary: The study on entanglement entropy and spectrum between components in binary Bose-Einstein condensates revealed anomalous square-root dispersion relation with intercomponent tunneling, and gapped dispersion relation in its absence. These spectral features are linked to long-range interactions within the entanglement Hamiltonian in terms of superfluid velocity and particle density. Unusual long-range interactions were found to be emulated in a subsystem of multicomponent BECs with only short-range interactions, demonstrating volume-law scaling of entanglement entropy with subleading logarithmic corrections.
Review
Physics, Applied
Masahito Ueda
NATURE REVIEWS PHYSICS
(2020)
