Article
Optics
Xue-Ting Fang, Zheng-Qi Dai, Di Xiang, Shou-Long Chen, Shao-Jun Li, Xiang Gao, Qian-Ru Zhu, Xing Deng, Lushuai Cao, Zhong-Kun Hu
Summary: Research has uncovered that, in the intermediate interaction regime, the categorization of eigenstates is preserved even when the eigenenergy spectrum becomes gapless, due to the mini gap induced by finite-size effects. The disappearance of gaps in the spectrum results in direct and avoided crossings between close-lying manifolds, determined by the combined symmetries of the manifolds.
Article
Multidisciplinary Sciences
Mario H. Figlioli Donato, Sergio R. Muniz
Summary: In this study, an intriguing effect caused by a thin finite barrier in a quasi-one-dimensional toroidal spinor Bose-Einstein condensate (BEC) is explored, revealing a Josephson-like current that can be used to probe the spinor symmetry solely through measurements of the superfluid current.
Article
Multidisciplinary Sciences
Y-Q Zou, B. Bakkali-Hassani, C. Maury, E. Le Cerf, S. Nascimbene, J. Dalibard, J. Beugnon
Summary: The authors used Ramsey interferometry to investigate Tan's contact in a uniform two-dimensional Bose gas of 87Rb atoms across the Berezinskii-Kosterlitz-Thouless superfluid transition, finding that the two-body contact is continuous at the critical point.
NATURE COMMUNICATIONS
(2021)
Article
Multidisciplinary Sciences
Bertrand Evrard, An Qu, Jean Dalibard, Fabrice Gerbier
Summary: In this study, a three-fragment condensate was produced for a mesoscopic spin-1 gas with anti-ferromagnetic interactions and vanishing collective spin. The reconstructed state was found to be close to the expected many-body ground state using spin-resolved detection, while one-body observables remained the same as for a completely mixed state. This highlights how the interplay between symmetry and interactions generates entanglement in a mesoscopic quantum system.
Article
Optics
Kingshuk Adhikary, Anushree Dey, Arpita Pal, Subhanka Mal, Bimalendu Deb
Summary: In this theoretical study, we investigate the time- and frequency-domain two-particle correlations in a driven-dissipative Bose-Hubbard model near and at a dissipative phase transition. The Hanbury Brown-Twiss (HBT) correlations show oscillations at the transition point due to the imaginary part of the Liouvillian gap, and the Fourier transform provides information on the transition and Liouvillian dynamics. Analyses of the Wigner distribution and frequency peaks illustrate the quantum statistical properties of the model near the phase-transition point.
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
Physics, Multidisciplinary
Milan Radonjic, Axel Pelster
Summary: This study investigates a time-dependent extension to the perturbative mean-field approach for the homogeneous dirty boson problem, delving into the effects of switching on and off a weak disorder potential on the stationary state of a Bose-Einstein condensate. The results show that the condensate deformation serves as an indicator of the non-equilibrium nature of steady states in a temporally controlled weak disorder setting.
Article
Physics, Multidisciplinary
Victor E. Colussi, Fabio Caleffi, Chiara Menotti, Alessio Recati
Summary: We study the effects of quantum fluctuations in the two-component Bose-Hubbard model and generalize the quantum Gutzwiller approach to mixtures. The mean-field ground-state phase diagram and spectrum of elementary excitations are analyzed, with a focus on quantum phase transitions. We investigate the superfluid transport properties and the linear response dynamics to density and spin probes within the quantum critical regimes. We find that quantum fluctuations have a significant impact on the drag between the superfluid species in the system, especially in the vicinity of the paired and antipaired phases absent in the usual one-component Bose-Hubbard model. Additionally, the contributions of quantum corrections to the one-body coherence and density/spin fluctuations are analyzed from the perspective of the collective modes of the system, providing results for the few-body correlations in all regimes of the phase diagram.
Article
Mathematics, Interdisciplinary Applications
Cui-Cui Ding, Qin Zhou, Si-Liu Xu, Yun-Zhou Sun, Wen-Jun Liu, Dumitru Mihalache, Boris A. Malomed
Summary: In this study, we investigate the controlled evolution of nonautonomous solitons in a spinor Bose-Einstein condensate. By analyzing a system of three coupled Gross-Pitaevskii equations with spatiotemporal modulation, we derive an integrability condition and a nonisospectral Lax pair. This allows us to obtain an infinite set of dynamical invariants and generate one- and two-soliton solutions using the Darboux transform. We find various solutions for controlled nonautonomous solitons, including self-compressed, snake-like, stepwise solitons, and even rogue wave-like states.
CHAOS SOLITONS & FRACTALS
(2023)
Article
Optics
Yabo Li, Dominik Schneble, Tzu-Chieh Wei
Summary: We investigate dynamically coupled one-dimensional Bose-Hubbard models and solve for the wave functions and energies of two-particle eigenstates. Our study reveals the existence of four different continua and three doublon dispersions in the two-particle spectrum of a system with generic interactions. The presence of doublons and their energies depend on the coupling strength between two species of bosons and the interaction strengths. We provide details on the spectrum and properties of two-particle states, and analyze the difference in time evolution under different coupling strengths and the relation between the long-time behavior of the system and the doublon dispersion. These dynamics can be observed in cold atoms and potentially simulated by digital quantum computers.
Article
Physics, Multidisciplinary
Seyed Mostafa Moniri, Heshmatollah Yavari, Elnaz Darsheshdar
Summary: This study investigates the low-temperature shear viscosity of a one-component p-wave superfluid Fermi gas in the strong-coupling limit, taking into account the p-wave Cooper channel in the self-energy. The viscous relaxation rates determined are temperature-dependent and differ from the s-wave superfluid Fermi gas, due to anisotropic pairing interaction in the p-wave superfluid. This research contributes to understanding how anisotropy affects transport properties of this unconventional superfluid Fermi gas in the low temperature limit.
Article
Physics, Multidisciplinary
Karol Gietka, Farokh Mivehvar, Thomas Busch
Summary: A novel composite light-matter magnetometer is proposed, using a multi-component Bose-Einstein condensate coupled to two distinct electromagnetic modes of a linear cavity for magnetic field measurement. The sensitivity of this magnetometer exhibits Heisenberg-like scaling with respect to the atom number, with a calculated lower bound for sensitivity at the order of fT (root Hz(-1))(-1) -pT (root Hz)(-1) for a condensate of 10(4) atoms with coherence times on the order of several ms under state-of-the-art experimental parameters.
NEW JOURNAL OF PHYSICS
(2021)
Editorial Material
Physics, Multidisciplinary
Li Zhang, Wenjie Liu, Jiahao Huang, Chaohong Lee
Summary: The research presents a cluster mean-field study on the ground-state phase diagram and many-body dynamics of spin-1 bosons in a two-chain Bose-Hubbard ladder, revealing different phase transitions and the impact of spin-dependent interaction on many-body dynamics.
Article
Optics
Brendan Rhyno, Nathan Lundblad, David C. Aveline, Courtney Lannert, Smitha Vishveshwara
Summary: Inspired by investigations of BECs in the Cold Atom Laboratory aboard the International Space Station, this study examines the thermodynamic properties of shell-shaped BECs under a spherically symmetric bubble trap potential. The evolution of the system from small filled spheres to large, hollow shells is studied by tuning trap parameters, with analysis of the bubble trap spectrum and states to quantify dimensional crossover to quasi-2D physics. The study also evaluates the critical temperature for BEC formation and the cooling process during adiabatic expansion, highlighting the importance of vortex physics in thin shells and caution with semiclassical treatments.
Article
Physics, Multidisciplinary
Cuicui Ding, Qin Zhou, Siliu Xu, Houria Triki, Mohammad Mirzazadeh, Wenjun Liu
Summary: In this study, we investigate the controlled evolution of nonautonomous matter-wave breathers and rogue waves in spinor Bose-Einstein condensates with spatiotemporal modulation. By focusing on a system of three coupled Gross-Pitaevskii equations with spacetime-dependent external potentials and temporally modulated gain-loss distributions, we derive various solutions for controlled nonautonomous matter-wave breathers and rogue waves using the Darboux transformation method. We find breathers and rogue waves with periodic and parabolic trajectories on arched and constant backgrounds. The effects of gain-loss distribution and linear potential on these solutions are studied, and nonautonomous two-breathers on arched and constant backgrounds are also obtained.
CHINESE PHYSICS LETTERS
(2023)
