Article
Physics, Multidisciplinary
Juan-juan Qi, Dun Zhao, Wu-Ming Liu
Summary: We analytically investigate the effects of spin-orbit coupling (SOC) on soliton collisions in spin-1 Bose-Einstein condensates (BECs). By using the non-standard Hirota's bilinear method, we derive exact soliton solutions for a 1D spin-orbit coupled spin-1 BEC, revealing how SOC can manipulate the dynamics of solitons in spinor BECs. We discuss in detail the soliton collisions of different types under SOC, including ferromagnetic-polar, ferromagnetic-ferromagnetic, and polar-polar collisions. Comparisons between systems with and without SOC show a remarkable phenomenon: SOC can cause the splitting of a soliton.
JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL
(2023)
Article
Physics, Multidisciplinary
Yuanyuan Chen, Hao Lyu, Yong Xu, Yongping Zhang
Summary: This study investigates the elementary excitations of a spin-orbit-coupled spin-1 Bose-Einstein condensate in different phases, and finds that these excitations depend on the spin-orbit coupling parameters.
NEW JOURNAL OF PHYSICS
(2022)
Article
Physics, Multidisciplinary
Hui Guo, Xu Qiu, Yan Ma, Hai-Feng Jiang, Xiao-Fei Zhang
Summary: The dynamics of bright solitons in a spin-orbit coupled spin-1 Bose-Einstein condensate were investigated both analytically and numerically. It was found that the spin-orbit coupling couples the soliton's spin with its center-of-mass motion, resulting in periodical oscillation of the center-of-mass. The motion of the center-of-mass of the soliton can be viewed as a superposition of periodical and linear motions.
Article
Physics, Condensed Matter
S. K. Adhikari
Summary: This study investigates supersolid-like states in a quasi-two-dimensional trapped Rashba and Dresselhaus spin-orbit coupled spin-1 condensate. Different types of states are formed depending on the strength of spin-orbit coupling, including superlattice/superstripe states and multi-ring states. These states are found to be dynamically stable and will contribute to a better understanding of crystallization in solids.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2021)
Article
Engineering, Mechanical
Kashif Ammar Yasir, Yu Chengyong, Gao Xianlong
Summary: In this study, we investigate the steady-state multi-stability of a cavity system containing spin-orbit coupled Bose-Einstein condensate. We show that the cavity photon number and atomic population exhibit multi-stable behavior, which can be tuned with system parameters. Additionally, we find the occurrence of population transitional phase for the atomic states, which can be controlled by spin-orbit coupling and Zeeman field effects.
NONLINEAR DYNAMICS
(2023)
Article
Optics
Jing Li, E. Ya Sherman, Andreas Ruschhaupt
Summary: This paper explores the potential of a spin-orbit-coupled Bose-Einstein condensate in thermodynamic cycles by proposing a quantum heat engine using the condensate as a working medium. The cooling and heating processes are simulated through the contacts between the condensate and external magnetized and demagnetized media. The efficiency of the proposed engine is then studied, with the existence of a critical value of spin-orbit coupling that is related to the engine's maximum efficiency.
Article
Physics, Multidisciplinary
Xuan Xu, Chao Gao, Ji Lin, Hui-jun Li
Summary: In this study, we investigate the effects of spin-orbit coupling, external potential, and rotation frequency/direction on the profile and stability of a striped state in a two-dimensional Bose-Einstein condensate. We find that the number of stripes in both spinor components increases with the strength of spin-orbit coupling, while the difference in striped numbers remains one. The addition of a rotation term changes the profiles of the spinor components qualitatively and alters the regulation of the striped numbers, but the difference in striped numbers remains one. Furthermore, the rotation direction only causes an exchange between the striped states of the two spinor components, and the rotation frequency leads to a transition from the striped state to a mixture of striped and vortex states.
COMMUNICATIONS IN THEORETICAL PHYSICS
(2022)
Article
Computer Science, Interdisciplinary Applications
Rajamanickam Ravisankar, Dusan Vudragovic, Paulsamy Muruganandam, Antun Balaz, Sadhan K. Adhikari
Summary: This paper presents OpenMP versions of FORTRAN programs for solving the Gross-Pitaevskii equation for a harmonically trapped three-component spin-1 spinor Bose-Einstein condensate. The programs include different forms of spin-orbit and Rabi couplings in 1D and 2D spatial dimensions, utilizing split-step Crank-Nicolson discretization for imaginary- and real-time propagation. The programs can calculate stationary states, BEC dynamics, and various physical quantities, with outputs such as wave function, energy, and density profiles.
COMPUTER PHYSICS COMMUNICATIONS
(2021)
Article
Physics, Multidisciplinary
S. K. Adhikari
Summary: In this study, spontaneous spatial order in stripe and super-lattice solitons in a Rashba spin-orbit coupled spin-1 ferromagnetic Bose-Einstein condensate is demonstrated. The type of solitons changes with the strength of the SO coupling, with different types of solitons found for weak, intermediate, and large SO coupling strengths.
Article
Computer Science, Interdisciplinary Applications
Paramjeet Banger, Pardeep Kaur, Arko Roy, Sandeep Gautam
Summary: This article provides updated versions of FORTRAN 90/95 programs parallelized with OpenMP for numerically studying the ground states and/or dynamics of homogeneous or trapped spin-1 or spin-2 Bose-Einstein condensates (BECs) with anisotropic spin-orbit (SO) coupling. The coupled sets of three or five Gross-Pitaevskii (GP) equations for spin-1 or spin-2 BEC are solved using a time-splitting Fourier spectral method.
COMPUTER PHYSICS COMMUNICATIONS
(2022)
Article
Physics, Multidisciplinary
Jie Wang, Jun-Cheng Liang, Zi-Fa Yu, An-Qing Zhang, Ai-Xia Zhang, Ju-Kui Xue
Summary: We study the ground state phases of quasi-one-dimensional spin-orbit coupled spin-1 Bose-Einstein condensates trapped in a harmonic potential. Based on variational analysis, we obtain the conditions for phase transition between magnetized and unmagnetized phases analytically for the first time, and reveal the physical mechanism of inducing phase transition. We discuss the competition relationship among spin-independent interaction, spin-dependent interaction, spin-orbit (SO) coupling, and the harmonic potential for generating phase transition systematically.
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
Optics
Stefan Ostermann, Helmut Ritsch, Farokh Mivehvar
Summary: In this study, we investigate the many-body phases of a two-dimensional Bose-Einstein condensate with cavity-mediated dynamic spin-orbit coupling. We identify three quantum phases with distinct atomic and photonic properties: the normal homogeneous phase, the superradiant spin-helix phase, and the superradiant supersolid spin-density-wave phase. The last phase exhibits an emergent crystal with a specific lattice structure in the atomic density distribution.
Article
Computer Science, Interdisciplinary Applications
Paulsamy Muruganandam, Antun Balaz, Sadhan K. Adhikari
Summary: The program presented here solves the Gross-Pitaevskii equation for a three-component rotating spin-1 BEC in a harmonic trap in two dimensions, with options for different spin-orbit couplings. It uses the split-step Crank-Nicolson scheme for both imaginary and real-time propagation for calculating stationary states and BEC dynamics.
COMPUTER PHYSICS COMMUNICATIONS
(2021)
Article
Optics
Huan Zhang, Sheng Liu, Yong-Sheng Zhang
Summary: This study investigates Faraday patterns generated by parametric resonance induced by spin-orbit coupling in a spinor Bose-Einstein condensate with repulsive interaction. The interplay between Faraday instabilities and modulation instabilities during a quench when the spin-orbit coupled Bose-Einstein condensate transitions from zero-momentum phase to plane-wave phase is examined.
Article
Physics, Multidisciplinary
Xi-Wang Luo, Chuanwei Zhang
Summary: The study explores the Moiré physics emerging from twisting two independent hexagonal optical lattices of atomic spin states, showing potential for magic twist angles to support gapped flat bands. Enhanced density of states near the flat bands can lead to superfluidity driven by weak attractive interactions, with the superfluid phase corresponding to a Larkin-Ovchinnikov state with finite momentum pairing. This work may lead to novel quantum phases and twistronics in cold atomic systems.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Multidisciplinary
Yongping Zhang, Zhu Chen, Biao Wu, Thomas Busch, Vladimir V. Konotop
Summary: The interaction between nonlinearity and PT symmetry in a periodic potential results in peculiar features of nonlinear periodic solutions, including thresholdless symmetry breaking and asymmetric (multi-)loop structures of the nonlinear Bloch spectrum. These features are explained within the framework of a two-mode approximation and an effective potential theory and are validated numerically.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Multidisciplinary
Yuanyuan Chen, Hao Lyu, Yong Xu, Yongping Zhang
Summary: This study investigates the elementary excitations of a spin-orbit-coupled spin-1 Bose-Einstein condensate in different phases, and finds that these excitations depend on the spin-orbit coupling parameters.
NEW JOURNAL OF PHYSICS
(2022)
Article
Physics, Multidisciplinary
Jin Su, Hao Lyu, Yongping Zhang
Summary: In this study, we reveal self-interfering dynamics in a noninteracting Bose-Einstein condensate with engineered dispersion by optical lattice or spin-orbit coupling. The self-interference arises from the co-occupation of positive and negative effective mass regions in the engineered dispersion. The physical origin of the self-interference is explained by the Wigner distribution function of the self-interfering wave packet, and detailed features of the self-interference pattern are characterized.
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
Physics, Multidisciplinary
Keyan Liu, Huaxin He, Yongping Zhang
Summary: In this paper, we study the ground states of a spin-1 Bose-Einstein condensate (BEC) with spin-orbit coupling and spin-tensor-momentum coupling, which can be experimentally implemented by Raman lasers induced transitions. We investigate the similarities and differences between these two experimentally realizable couplings, as well as the effects of spin-flip symmetries and the toroidal trap on the density of ground states. Furthermore, we discuss the influence of quadratic Zeeman shift and detuning on the ground states based on the single-particle dispersion relation.
Article
Physics, Multidisciplinary
Mengxiang Zhang, Xinxing Yuan, Yue Li, Xi-Wang Luo, Chang Liu, Mingdong Zhu, Xi Qin, Chuanwei Zhang, Yiheng Lin, Jiangfeng Du
Summary: In this study, we experimentally explore the transitions between different types of triply degenerate points (TDPs) and observe the phase transitions using Berry flux measurement. We demonstrate the controllability of a multilevel ion as a versatile platform to study high-spin physics, paving the way for exploring novel topological phenomena.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Multidisciplinary
Santosh Kumar, Zhaotong Li, Ting Bu, Chunlei Qu, Yuping Huang
Summary: This paper presents a nonlinear optical Ising machine using spatial light modulators to find distinct phase transitions, providing a more efficient platform for solving optimization problems. Optical Ising machines promise to solve complex optimization problems with an optical hardware acceleration advantage.
COMMUNICATIONS PHYSICS
(2023)
Article
Optics
Zhiqian Gui, Zhenming Zhang, Jin Su, Hao Lyu, Yongping Zhang
Summary: This study reveals the mechanism of phase separation in a trapped spin-1/2 Bose-Einstein condensate with spin-orbit coupling and analyzes the differences between phase separations in different conditions. It proposes an application of adiabatic splitting dynamics.
Article
Physics, Multidisciplinary
Ying Su, Heqiu Li, Chuanwei Zhang, Kai Sun, Shi-Zeng Lin
Summary: This research demonstrates a generic mechanism to achieve topological flat minibands by confining massive Dirac fermions in a periodic moiré potential. It clarifies the importance of Dirac structure for the topological minibands and unveils a general strategy to design topological moire materials.
PHYSICAL REVIEW RESEARCH
(2022)
Article
Optics
Hao Lyu, Yongping Zhang, Thomas Busch
Summary: We propose a method to detect phonon and roton excitations in a two-dimensional Bose-Einstein condensate with Raman-induced spin-orbit coupling by perturbing the atomic cloud with a weak barrier. The two excitation modes can be observed by moving the barrier along different directions, and phonon excitations are identified by the appearance of solitary waves, while roton excitations lead to distinctive spatial density modulations. We demonstrate that this method can also be used to determine the anisotropic critical velocities of superfluid.
Article
Optics
Keyan Liu, Huaxin He, Chenhui Wang, Yuanyuan Chen, Yongping Zhang
Summary: This study combines spin-orbit coupling, spin-1 Bose-Einstein condensates, and toroidal traps, and analyzes the ground-state phase diagram. The spin-flip symmetries give rise to two interesting phases.
Article
Optics
Jin Su, Hao Lyu, Yuanyuan Chen, Yongping Zhang
Summary: A simple and efficient method for generating gap solitons in a spin-orbit-coupled spin-1 Bose-Einstein condensate is proposed, where two moving solitons can be generated by free expansion along the spin-orbit coupling dimension, identified from a generalized massive Thirring model. The dynamics of the gap solitons can be controlled by adjusting spin-orbit coupling parameters.
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
Optics
Huaxin He, Yongping Zhang
Summary: The study demonstrates that Rabi coupling can stabilize superfluids in a two-component Bose-Einstein condensate in the presence of optical lattices. Additionally, a significant separation between Landau and dynamical instabilities is observed in a Rabi-coupled Zeeman lattice.
