Article
Physics, Multidisciplinary
J. C. Obeso-Jureidini, G. A. Dominguez-Castro, E. Neri, R. Paredes, V Romero-Rochin
Summary: This study demonstrates the universality of long-distance behavior for two-body density correlation functions and Cooper-pair probability density in a balanced mixture of a two-component Fermi gas during the Bardeen-Cooper-Schrieffer (BCS)-Bose-Einstein condensate (BEC) smooth transition. Numerical results show that these two-body quantities exhibit exponential decay with respect to the chemical potential and the low-energy behavior of the gap. A general expression is derived for the two-body distributions, which holds for various features of finite-range potentials.
NEW JOURNAL OF PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
M. E. Ateuafack, G. D. Kemlekeu, M. G. Akumbom, J. T. Diffo, V. B. Mborong, L. C. Fai
Summary: The negative impact of population imbalance on the superfluid density was observed in the weak coupling regime. Furthermore, it was found that the system robustly resisted population imbalance in the strong coupling regime.
RESULTS IN PHYSICS
(2021)
Article
Materials Science, Multidisciplinary
Ceren B. Dag, Yidan Wang, Philipp Uhrich, Xuesen Na, Jad C. Halimeh
Summary: We find a self-similar prethermal dynamical regime in the time evolution of one-dimensional spin chains when quenching near a quantum phase transition. This regime is analytically determined by the ground-state energy gap and exists universally regardless of the probe site, weak interactions, or the initial state. The resulting prethermal dynamics result in an out-of-equilibrium scaling function of the order parameter near the transition. Our theory suggests that sudden quench dynamics can lead to universal critical slowing down near the critical point.
Article
Materials Science, Multidisciplinary
Ceren B. Dag, Kai Sun
Summary: This paper investigates the dynamical detection of quantum phases and phase transitions in quenched systems, revealing significant differences in scaling law exponent near the dynamical crossover between short and long times. It also shows that when integrability is strongly broken, the crossover boundary transforms into a region separating two other dynamical regions acting as dynamically ordered and disordered regimes.
Article
Multidisciplinary Sciences
Anika Frolian, Craig S. Chisholm, Elettra Neri, Cesar R. Cabrera, Ramon Ramos, Alessio Celi, Leticia Tarruell
Summary: Researchers have successfully performed a quantum simulation of a topological gauge theory by implementing a one-dimensional reduction of the Chern-Simons theory in a Bose-Einstein condensate. They eliminated the gauge degrees of freedom by utilizing local conservation laws and engineering optically dressed atomic states with specific scattering properties, revealing key properties of the theory.
Article
Physics, Multidisciplinary
Stephen Eckel, Ted Jacobson
Summary: The theoretical analysis of an expanding ring-shaped Bose-Einstein condensate reveals that expansion causes the phonon frequency to cool and the amplitude to weaken. This behavior is analogous to the redshifting and Hubble friction for quantum fields in the expanding universe, and is consistent with recent experimental and theoretical results. This study demonstrates the applicability of action-based dimensional reduction methods in various settings and perturbation expansions.
Article
Optics
Guan-Qiang Li, Xi-Wang Luo, Junpeng Hou, Chuanwei Zhang
Summary: Recent experimental progress has been made in observing long-sought supersolidlike states and superfluid stripe ground states in Bose-Einstein condensates. The study shows that these two symmetry breaking mechanisms can be distinguished by their collective excitation spectra, with experimental evidence for gapped pseudo-Goldstone modes in the forced stripe phase. This work may pave the way for exploring spontaneous and forced or approximate symmetry breaking mechanisms in different physical systems.
Article
Physics, Multidisciplinary
Jia Rui-Yu, Fang Ping-Ping, Gao Chao, Lin Ji
Summary: This work systematically discusses the possibility and mechanism of quantum shock waves in a one-dimensional BEC. The study shows that different phenomena are observed under different interaction conditions, with the existence of shock waves explained through quantum interference effects. The research also explores the properties of shock waves and provides theoretical guidance for experimentally realizing and measuring shock waves.
ACTA PHYSICA SINICA
(2021)
Article
Physics, Multidisciplinary
Y. Suzuki, K. Wakamatsu, J. Ibuka, H. Oike, T. Fujii, K. Miyagawa, H. Taniguchi, K. Kanoda
Summary: The study investigates the superconducting properties and pairing condensate of doped spin liquid materials under different pressures, revealing a transition from a BEC-like condensate at low pressures to a BCS-like condensate at high pressures. Nernst-effect measurements distinctly illustrate the two regimes of pairing in terms of robustness to magnetic field.
Article
Physics, Multidisciplinary
Dragos-Victor Anghel
Summary: Recent research has shown that the BCS formalism has multiple solutions for the energy gap and equilibrium quasiparticle distribution, with the phase transition temperature depending on the position of the chemical potential. The phase transition may not only be a second-order phase transition, but also a first-order phase transition. Even in the classical BCS problem where the AB is symmetric, there are still multiple solutions available, with the energy gap of the second solution being one third of the typical BCS solution at zero temperature.
PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS
(2021)
Article
Quantum Science & Technology
Sven Bachmann, Wojciech De Roeck, Brecht Donvil, Martin Fraas
Summary: This article explores the relationship between the gapped ground state of a quantum spin system and spatial relaxation, assuming the ground state is frustration-free and invertible. By studying open boundary conditions, the stretched exponential decay phenomenon is proved.
Article
Mechanics
Dam Thanh Son, Mikhail Stephanov, Ho-Ung Yee
Summary: The study discusses the dependence of the phase diagram of a hypothetical isotope of helium with nuclear mass less than 4 atomic mass units. As the nuclear mass decreases, the temperatures of the superfluid phase transition and the liquid-gas critical point show different trends. Various scenarios are proposed, ruling out the simplest scenario through analysis of the Landau theory and suggesting a more likely sequence of changes in the phase diagram with decreasing nuclear mass.
JOURNAL OF STATISTICAL MECHANICS-THEORY AND EXPERIMENT
(2021)
Article
Physics, Multidisciplinary
Zhe Wang, Pan-Pan Fang, Yu-Liang Xu, Chun-Yang Wang, Rong-Tao Zhang, Han Zhang, Xiang-Mu Kong
Summary: This study investigates the phase diagram and dynamic critical behaviors of the one-dimensional anisotropic XY model with ferromagnetic and antiferromagnetic interactions. By employing the quantum renormalization-group method, three phases were identified in the system, with concurrence oscillating periodically over time in two quantum quenching methods. The findings suggest a scaling behavior for the evolution period and a reciprocal relation between the evolution period exponent theta and correlation length exponent nu.
PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS
(2021)
Article
Physics, Multidisciplinary
Xin Qiao, Xiao-Bo Zhang, Yue Jian, Ai-Xia Zhang, Ju-Kui Xue
Summary: The study investigates the spatio-temporal evolution dynamics of two-leg ladder systems with magnetic flux using theoretical and numerical methods, discussing transient dynamics induced by sudden changes in initial conditions, and observing rich and interesting phenomena.
PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS
(2021)
Article
Physics, Applied
Jun Tokimoto, Shunji Tsuchiya, Tetsuro Nikuni
Summary: Josephson oscillation is a phenomenon in superfluids where supercurrent tunnels through a potential barrier, resulting in the oscillation of population difference. Transition from Josephson oscillation to self-trapping has been observed in experiments of Bose-condensed gas. We numerically analyze normal Josephson oscillations and self-trapping in a Fermi superfluid gas across the BCS-BEC crossover.
JOURNAL OF LOW TEMPERATURE PHYSICS
(2022)