Article
Physics, Multidisciplinary
Rajesh K. Malla, Vladimir Y. Chernyak, Chen Sun, Nikolai A. Sinitsyn
Summary: This article investigates a model describing the conversion between ultracold bosonic atoms and molecules through a stimulated reaction. By solving the model equations, the study finds a dynamic phase transition in the reaction efficiency dependent on the transition rate. For the process of molecular dissociation, if the atomic modes have a linear energy dispersion, the emerging phase may have a thermalized energy distribution of noninteracting bosons defined by the transition rate.
PHYSICAL REVIEW LETTERS
(2022)
Article
Quantum Science & Technology
Patrick Boegel, Alexander Wolf, Matthias Meister, Maxim A. Efremov
Summary: Motivated by the recent experimental realization of ultracold quantum gases in shell topology, we propose a straightforward implementation of matter-wave lensing techniques for shell-shaped Bose-Einstein condensates. This approach allows to significantly extend the free evolution time of the condensate shell after release from the trap and enables the study of novel quantum many-body effects on curved geometries. With both analytical and numerical methods we derive optimal parameters for realistic schemes to conserve the shell shape of the condensate for times up to hundreds of milliseconds.
QUANTUM SCIENCE AND TECHNOLOGY
(2023)
Article
Optics
Jintao Xu, Qian Jia, Haibo Qiu, Antonio Munoz Mateo
Summary: In this study, we demonstrate the chiral properties of Bose-Einstein condensates in optical lattices by observing nonlinear Bloch states and localized states. The stability of these states is checked through excitations and time evolution, and the phenomenon of Bloch oscillations is explored.
Article
Materials Science, Multidisciplinary
Jingjing Jin, Wei Han, Huifang Zhao, Wenyuan Liu
Summary: This study investigates the Moire superlattice structures generated by the interplay between vortex lattice and optical lattice in two-component Bose-Einstein condensates. The possible superlattice patterns under different twist angles are studied, as well as the relative shift of the Moire superlattices in two components of the condensates.
RESULTS IN PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Ekaterina Aladinskaia, Roman Cherbunin, Evgeny Sedov, Alexey Liubomirov, Kirill Kavokin, Evgeny Khramtsov, Mikhail Petrov, P. G. Savvidis, Alexey Kavokin
Summary: This study investigates the formation of exciton-polariton condensates in potlike traps created by optical pumping in a planar microcavity with embedded quantum wells. The experiment reveals the discrete spectrum of polariton eigenstates and demonstrates the control of these states through manipulating the shape and size of the trap and the spatial density distribution of the exciton reservoir.
Article
Physics, Multidisciplinary
Ai-Xia Zhang, Xiao-Wen Hu, Wei Zhang, Jun-Cheng Liang, Ju-Kui Xue
Summary: We discuss the localization and spin dynamics of tunable spin-orbit coupled Bose-Einstein condensates in deep optical lattices. Rich localized phenomena are observed, and the critical conditions for different localized states are obtained analytically and confirmed numerically. Under the critical conditions, localized states with fixed initial spin polarization are observed. When the critical condition is not satisfied, spin dynamics are excited due to the quenching of Raman coupling from the soliton state.
Article
Mathematics, Applied
Tingxi Hu, L. U. Lu
Summary: In this paper, we investigate complex-valued vortex states of trapped attractive Bose-Einstein condensates (BECs) by considering an L2-critical constraint minimization problem. We prove that the existence or nonexistence of vortex states depends on the threshold a*(m) and the value of V(0). In the absence of vortex states at the threshold a*(m), we also study the limiting behavior of vortex states as a approaches a*(m) when the trapping potential V(x) vanishes on the unit circle B(0, 1) in R2.
DISCRETE AND CONTINUOUS DYNAMICAL SYSTEMS
(2023)
Article
Astronomy & Astrophysics
Decheng Ma, Chenglong Jia, Enrique Solano, Lucas Chibebe Celeri
Summary: The propagation of phonons in the presence of a particle sink with radial flow in a Bose-Einstein condensate is considered. It is found that due to the particle sink, which simulates a static acoustic black hole, the phonon experiences significant spacetime curvature at a considerable distance from the sink. The trajectory of the phonons is bent after passing by the particle sink, simulating the gravitational lensing effect in a Bose-Einstein condensate. Possible experimental implementations are discussed.
Review
Optics
V. Yukalov, E. P. Yukalova, V. S. Bagnato
Summary: The review presents the methods and properties of generating nonlinear coherent excitations in strongly nonequilibrium Bose-condensed systems of trapped atoms. It emphasizes the principal difference between nonlinear coherent modes and linear collective excitations. The methods of generating nonlinear modes and their properties are described. The paper discusses matter-wave interferometry with coherent modes and the various effects observed, such as interference patterns, Rabi oscillations, and harmonic generation.
Article
Materials Science, Multidisciplinary
Yu-Xi Xu, Yuan Zhao, Qi-Hong Huang, De-Wei Wang, Zhuo Fan, Li Xue, Si-Liu Xu
Summary: The researchers theoretically investigated the localization of nonlinear matter waves in the PT-symmetric Rydberg atomic BECs system, finding that they can be generated and maintained with stability. Fundamental, higher-order, and vortical solitons were discovered, and their stability was evaluated through numerical simulation and linear-stability analysis. Additionally, the collision of solitons showed a quasi-elastic feature.
RESULTS IN PHYSICS
(2023)
Article
Physics, Multidisciplinary
Jin-Ling Wang, Wen Wen, Ji Lin, Hui-Jun Li
Summary: We propose a scheme to generate and control supersonic shock waves in a non-resonantly incoherent pumped exciton-polariton condensate, and different types of shock waves can be generated by regulating the incoherent pump. The ranges of parameters about various shock waves are determined by the initial incidence function and the cross-interaction between the polariton condensate and the reservoir. Our proposal not only discusses the shock wave in the exciton-polariton condensate system with the repulsive self-interaction, but also finds the shock wave in the condensates system with attractive self-interaction.
CHINESE PHYSICS LETTERS
(2023)
Article
Engineering, Mechanical
Zhi Tan, Huilin Gong, Bo Zhu, Honghua Zhong, Shufang Hu
Summary: We study the construction and dynamics of 2D anisotropic vortex-bright soliton in spinor dipolar Bose-Einstein condensates. The optical lattice and dipole-dipole interaction support stable anisotropic VB solitons even for small values of norm. By adjusting the depth of the lattice, one can control the stability of the solitons. Additionally, the collision dynamics of kicked solitons can lead to a transition from the bright component to the vortex component.
NONLINEAR DYNAMICS
(2023)
Article
Optics
Samuel N. Alperin, Natalia G. Berloff
Summary: Researchers have found that the intrinsic particle flux in a photonic Bose-Einstein condensate can stabilize multiply charged vortex states and spontaneously form through dynamic symmetry breaking mechanisms during condensate formation. The vortex states are found to radiate acoustically at topologically quantized frequencies and are limited by a quantum Kelvin-Helmholtz instability. This represents a fundamental result in fluid dynamics for quantum photonic fluids.
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
Engineering, Mechanical
Hong Cao
Summary: In this study, we investigate the effect of Rosen-Zener tunneling on Bose-Einstein condensates in a triple-well potential using mean-field treatment. We first calculate the tunneling dynamics exactly in the linear case and observe that all atoms are trapped in the initially populated well. However, the introduction of nonlinear interaction significantly changes the tunneling dynamics, breaking the symmetry and leading to the emergence of self-trapping solutions within a fixed interval.
NONLINEAR DYNAMICS
(2023)
