Article
Physics, Multidisciplinary
Zoran Ristivojevic, K. A. Matveev
Summary: In a system of charged one-dimensional spin-1/2 fermions at low temperature, energy relaxation of highly excited quasiparticles (or holes) towards the chemical potential in the weak interaction regime is dominated by collisions with two other fermions. The relaxation rate is dramatically enhanced at low energies, scaling as the inverse sixth power of the excitation energy, due to the long-range nature of the Coulomb interaction.
PHYSICAL REVIEW LETTERS
(2021)
Article
Optics
Tobias Ilg, Hans Peter Buechler
Summary: We study the behavior of the excitation spectrum across the quantum phase transition from a superfluid to a supersolid phase of a dipolar Bose gas in one dimension. Using an effective Hamiltonian that includes beyond-mean-field effects, we analyze the system based on Bogoliubov theory with multiple order parameters. Our results show that the supersolid phase exhibits a stable excitation spectrum with Goldstone modes and an amplitude mode in the low-energy regime, and the transition into the supersolid phase is driven by the roton instability in a parameter regime achievable for dysprosium atoms.
Article
Physics, Multidisciplinary
Jun Hui See Toh, Katherine C. McCormick, Xinxin Tang, Ying Su, Xi-Wang Luo, Chuanwei Zhang, Subhadeep Gupta
Summary: In this study, the evolution of dynamically localized states in an interacting one-dimensional ultracold gas periodically kicked by a pulsed optical lattice was experimentally studied. The interaction was found to lead to the emergence of dynamical delocalization and many-body quantum chaos.
Article
Optics
Ovidiu Patu
Summary: The study demonstrates that the momentum distribution of a gas released from a trap asymptotically approaches that of a noninteracting Fermi gas in the initial trap, a phenomenon known as dynamical fermionization. This behavior has been experimentally confirmed in certain cases. Additionally, removal of axial confinement in a strongly interacting Bose-Fermi mixture also leads to dynamical fermionization, with the momentum distribution of each component resembling its density profile at the initial time. The dynamics of both fermionic and bosonic momentum distributions exhibit characteristics similar to single component bosons under a sudden change in trap frequency.
Article
Optics
Liang Mao, Yajiang Hao, Lei Pan
Summary: In this paper, the non-Hermitian skin effect (NHSE) is extended from noninteracting systems to interacting many-body systems by studying an exactly solvable non-Hermitian model, the Lieb-Liniger Bose gas with imaginary vector potential. The NHSE is characterized quantitatively through solving the Bethe ansatz equations and calculating the model's density profiles and momentum distributions. It is found that the NHSE is enhanced for bound-state solutions on the attractive side, while it shows a nonmonotonic behavior for the scattering state. This work provides an example of NHSE in exactly solvable many-body systems and suggests its extension to other non-Hermitian many-body systems, particularly integrable models.
Article
Materials Science, Multidisciplinary
Wei Tang, Jutho Haegeman
Summary: This paper investigates the microscopic construction of Kac-Moody algebra in continuous systems and validates it through bosonization and Bethe ansatz methods. The computation of Kac-Moody generators is also tested using continuous matrix product state simulations.
Article
Physics, Multidisciplinary
Gerard Pascual, Jordi Boronat
Summary: The Bose polaron system shows different behavior and properties at different temperatures, with a loss of quasiparticle nature close to the critical temperature. Additionally, the impurity hinders the condensation of bosons in the condensate.
PHYSICAL REVIEW LETTERS
(2021)
Article
Mathematics, Applied
Argha Debnath, Ayan Khan, Boris Malomed
Summary: This study investigates the static and dynamical properties of one-dimensional quantum droplets under the influence of local potentials in the form of narrow wells and barriers. The dynamics of the droplets are described by the one-dimensional Gross-Pitaevskii equation, including meanfield and beyond-mean-field terms. Stable solutions for localized states pinned to the well are found, and approximations for the well and the collision of the droplet with the barrier are developed. Simulations analyze the collisions of droplets with the wells and barriers, identifying outcomes such as fission and rebound effects.
COMMUNICATIONS IN NONLINEAR SCIENCE AND NUMERICAL SIMULATION
(2023)
Article
Physics, Multidisciplinary
Vladislav Yu. Shishkov, Evgeny S. Andrianov, Anton V. Zasedatelev, Pavlos G. Lagoudakis, Yurii E. Lozovik
Summary: In this study, we analytically describe a nonequilibrium polariton Bose-Einstein condensate (BEC) by solving the master equation for the full polariton density matrix in the fast thermalization limit. We find that the density matrix of a nonequilibrium BEC incorporates quantum correlations between all polariton states, and the formation of BEC is accompanied by the emergence of cross-correlations between the ground state and the excited states. Despite being a nonequilibrium system, the average population of polariton states follows the Bose-Einstein distribution with an almost zero effective chemical potential above the condensation threshold, similar to an equilibrium BEC. Moreover, we demonstrate that the effective temperature of polaritons drops below the reservoir temperature above threshold.
PHYSICAL REVIEW LETTERS
(2022)
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
Optics
Pawel Zin, Maciej Pylak, Mariusz Gajda
Summary: We describe a quantum droplet of a Bose-Bose mixture squeezed by an external harmonic force in one spatial direction. We investigate the droplet's profile and chemical potential using both numerical and analytic methods.
Article
Physics, Multidisciplinary
Sam Azadi, N. D. Drummond, W. M. C. Foulkes
Summary: Landau's Fermi liquid theory explains the main properties of quasiparticle excitations in an electron gas, which are crucial for understanding the behavior of metallic systems. Diffusion Monte Carlo methods were used in this study to calculate the effective mass of three-dimensional homogeneous electron gases as a function of density, showing a decrease in effective mass at lower densities, especially in the case of ferromagnetism.
PHYSICAL REVIEW LETTERS
(2021)
Article
Optics
Maciej Lebek, Andrzej Syrwid, Piotr T. Grochowski, Kazimierz Rzazewski
Summary: We analyze the dynamics of one-dimensional quantum gases with strongly attractive contact interactions and find that attractive forces can effectively act as strongly repulsive ones. Our findings extend the theoretical results on the super-Tonks-Girardeau gas and have implications for the domain stability in a two-component Fermi gas. We also discuss the effects of finite-range interactions and analyze the universality of the presented results. Moreover, our conclusions support the existence of metastable quantum droplets in the regime of strongly attractive contact and attractive dipolar interactions.
Article
Physics, Multidisciplinary
Martin Bonkhoff, Kevin Jaegering, Sebastian Eggert, Axel Pelster, Michael Thorwart, Thore Posske
Summary: Research shows that anyons with arbitrary exchange phases exist on 1D lattices and can be derived from interacting bosons in continuum theories. This theory maintains the exchange phase periodicity similar to 2D anyons and predicts different velocities for left- and right-moving collective excitations.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Multidisciplinary
Jing Yang, Adolfo del Campo
Summary: The exchange operator formalism is used to describe many-body integrable systems in terms of phase-space variables. We establish an equivalence between models described by this formalism and the infinite family of parent Hamiltonians describing quantum many-body models with Jastrow form ground states. This allows us to identify the invariants of motion and establish integrability for any model in the family.
PHYSICAL REVIEW LETTERS
(2022)
