Article
Multidisciplinary Sciences
Hui Chen, Haitao Yang, Bin Hu, Zhen Zhao, Jie Yuan, Yuqing Xing, Guojian Qian, Zihao Huang, Geng Li, Yuhan Ye, Sheng Ma, Shunli Ni, Hua Zhang, Qiangwei Yin, Chunsheng Gong, Zhijun Tu, Hechang Lei, Hengxin Tan, Sen Zhou, Chengmin Shen, Xiaoli Dong, Binghai Yan, Ziqiang Wang, Hong-Jun Gao
Summary: In this study, unconventional superconductivity and a pair density wave (PDW) were observed in CsV3Sb5, a vanadium-based kagome metal. The material exhibits a V-shaped pairing gap and a 3Q PDW, along with other unique characteristics such as strong-coupling superconductivity and charge order. These findings provide insights into the correlated electronic states and superconductivity in vanadium-based kagome metals.
Editorial Material
Physics, Multidisciplinary
Tim Keller, Thomas Fogarty, Thomas Busch
Summary: The study demonstrates that a Tonks-Girardeau gas in a Bose-Einstein condensate can transition to a crystal-like Mott state without an externally imposed lattice potential. The phase transition depends on the interspecies interaction and temperature of the TG gas and can be measured through accessible observables in cold atom experiments. An effective model was also developed to accurately describe the system in the pinned insulator state and derive the critical temperature of the transition.
PHYSICAL REVIEW LETTERS
(2022)
Article
Multidisciplinary Sciences
Anal Bhowmik, Ofir E. Alon
Summary: We investigate the complex dynamics of interacting bosonic clouds in a two-dimensional asymmetric double-well potential during resonant tunneling. The results reveal that longitudinal and transversal resonant tunneling can lead to the loss of coherence and fragmentation of the junction, with coupling between transverse and longitudinal degrees-of-freedom. By employing the multiconfigurational time-dependent Hartree for bosons (MCTDHB) method, we analyze the time evolution of physical quantities such as survival probability, occupation numbers, and variances, and identify the detailed mechanisms of many-body tunneling in two-dimensional double-well potentials.
SCIENTIFIC REPORTS
(2022)
Article
Materials Science, Multidisciplinary
B. Grygiel, K. Patucha
Summary: This paper studies the Bose-Hubbard model in the Lieb lattice using the time-dependent Gutzwiller mean-field approach. It is found that in the Mott insulator phase, the excitation modes have energy gaps and either purely particle or purely hole character, while in the superfluid phase, the excitation spectrum is gapless. The geometry of the Lieb lattice leads to nonuniform order parameters and oscillation energy in the ground state. This results in additional anticrossings between dispersive bands in the excitation spectra, with the flat bands being insensitive to this effect.
Article
Physics, Multidisciplinary
G. Del Pace, W. J. Kwon, M. Zaccanti, G. Roati, F. Scazza
Summary: In this study, the transport of a Fermi gas with unitarity-limited interactions across the superfluid phase transition is investigated. It was found that as the critical temperature is crossed, the conductivity evolves from highly nonlinear to Ohmic characteristics, with the critical breakdown of the Josephson dc current induced by pair condensate depletion. Additionally, a large anomalous contribution to resistive currents was revealed, reaching its maximum at the lowest temperature due to tunnel coupling between the condensate and phononic Bogoliubov-Anderson excitations.
PHYSICAL REVIEW LETTERS
(2021)
Article
Mathematics
Zhimeng Ouyang, Lei Wu
Summary: We consider the non-relativistic quantum Boltzmann equation for fermions and bosons, and using the nonlinear energy method and mild formulation, we prove the global well-posedness under the condition that the density function is near the global Maxwellian and vacuum. This work is a generalization and adaptation of the classical Boltzmann theory, and our main contribution lies in the detailed analysis of the nonlinear operator Q in the quantum context. It is the first part of a long-term project on quantum kinetic equations.
JOURNAL OF DIFFERENTIAL EQUATIONS
(2022)
Article
Optics
Soumik Bandyopadhyay, Hrushikesh Sable, Deepak Gaur, Rukmani Bai, Subroto Mukerjee, D. Angom
Summary: This study investigates the quantum phases of hardcore, polarized dipolar atoms confined in multilayer optical lattices. The competition between attractive interlayer interaction and interlayer hopping leads to the formation of multimers, which exhibit checkerboard ordering under intralayer isotropic repulsive interaction. At higher interlayer hopping, the multimers are destabilized to form resonating valence-bond-like states.
Article
Materials Science, Multidisciplinary
Zongping Gong, Robert H. Jonsson, Daniel Malz
Summary: This paper presents a systematic study of applying supersymmetry (SUSY) to band topology in noninteracting systems and divides topological insulators and superconductors into three classes based on the local and symmetric property of the supercharge. It also resolves the apparent paradox between the nontriviality of free fermions and the triviality of free bosons by considering the encoding of topological information in the identification map.
Article
Multidisciplinary Sciences
Victor S. L'vov, Yuri V. Lvov, Sergey Nazarenko, Anna Pomyalov
Summary: We develop a theory to explain the strong anisotropy of energy spectra in the thermally driven turbulent counterflow of superfluid He-4. The theory involves the differential closure of the energy flux vector and the anisotropy of the mutual friction force. We propose an approximate analytic solution and validate it with numerical solutions. The energy spectrum is strongly confined in the direction of the counterflow velocity, and in the direction orthogonal to the counterflow it exhibits two scaling ranges. This theory predicts the dependence of various details of the spectra and the transition to the universal critical regime on the flow parameters.
PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
(2022)
Review
Multidisciplinary Sciences
Luca Salasnich, Alberto Cappellaro, Koichiro Furutani, Andrea Tononi, Giacomo Bighin
Summary: We review the theoretical results of sound propagation in two-dimensional systems of ultracold fermionic and bosonic atoms. We discuss the coexistence of first and second sound in the superfluid phase and present models for sound velocity measurements in weakly-interacting regimes. Our calculations accurately compute superfluid density and show consistency with experimental results. Additionally, we calculate sound velocities in the BCS-BEC crossover and predict sound mode mixing in the finite-temperature BEC regime.
Article
Optics
Gianni Aupetit-Diallo, Silvia Musolino, Mathias Albert, Patrizia Vignolo
Summary: We investigate the equilibrium momentum distribution of strongly interacting one-dimensional mixtures of particles at zero temperature confined in a box potential. We find that the magnitude of the tail of the momentum distribution, characterized by 1/k4, is influenced not only by short-distance correlations but also by the presence of rigid walls. This additional contribution, which includes a k-independent term and an oscillating part, breaks the Tan relation and surprisingly encodes information on long-range spin correlations.
Article
Physics, Multidisciplinary
Chao Yin, Andrew Lucas
Summary: This article proves that quantum information propagates at a finite velocity in models of interacting bosons, and provides an extension of this result in one-dimensional models. The findings are relevant for physically realistic initial conditions in experimentally realized models of interacting bosons.
Article
Mechanics
Ziwu Li, Zhifan Liu, Qiyong Zhang, Meng Dai, Zijian Zhang, Yixuan He
Summary: A new solver based on the simplified two-fluid model has been developed and used to simulate the thermal counterflow phenomenon of superfluid helium. The numerical simulation results agree well with the experimental results, supporting the conjecture that large scale quantum turbulence in superfluid helium can be explained using classical mechanics.
Article
Optics
Soumyadeep Halder, Subrata Das, Sonjoy Majumder
Summary: The recent realization of a binary dipolar Bose-Einstein condensate opens up new possibilities for studying quantum droplets and supersolids in binary mixtures. In this study, the ground-state phases and dynamics of a Dy-Dy mixture are investigated using three-dimensional numerical simulations. Various interesting phases, including single-droplet, multiple-droplets, doubly supersolid, and superfluid states, are observed in both miscible and immiscible phases. The dynamics across phase boundaries are also explored, showing abrupt changes in phase and the formation of metastable states.
Article
Materials Science, Multidisciplinary
Rebecca Kraus, Titas Chanda, Jakub Zakrzewski, Giovanna Morigi
Summary: In this article, a theoretical analysis of the phase diagram of a quantum gas of bosons interacting via repulsive dipolar interactions is conducted. Numerical techniques are used to evaluate the phase diagram for unit density, revealing a significant impact of correlated tunneling on the parameter range of the topological insulator phase.
