Article
Mathematics, Applied
Ling-Zheng Meng, Yan-Hong Qin, Li-Chen Zhao
Summary: This paper investigates the properties and motion of vector solitons in Bose-Einstein condensates, exploring the nonintegrable cases of spin soliton solutions and their stability. The results show that these spin solitons are robust against spin-dependent interactions and noise, exhibiting features such as negative-positive mass transition, splitting, diffusion, and collisions.
COMMUNICATIONS IN NONLINEAR SCIENCE AND NUMERICAL SIMULATION
(2022)
Article
Optics
Hiromitsu Takeuchi
Summary: The theoretical investigation of the phase diagram of lowest-energy vortices in the polar phase of spin-1 Bose-Einstein condensates reveals three types of vortices: elliptic AF-core vortices, axisymmetric F-core vortices, and N-core vortices. These vortices are named based on the local ordered state and have different stability conditions under various interactions. The phase transition between different types of vortices is studied, with continuous transitions observed between N-core vortex and the other two vortices, and a discontinuous transition between AF-core and F-core vortices.
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
Materials Science, Multidisciplinary
Minseong Lee, Rico Schoenemann, Hao Zhang, David Dahlbom, Tae-Hwan Jang, Seung-Hwan Do, Andrew D. Christianson, Sang-Wook Cheong, Jae-Hoon Park, Eric Brosha, Marcelo Jaime, Kipton Barros, Cristian D. Batista, Vivien S. Zapf
Summary: We conducted a high-field study on the S = 2 quantum magnet Ba2FeSi2O7, which has a strongly anisotropic easy-plane square lattice. By observing the spin level crossing and magnetic field-induced spin level crossing, we studied the interplay between spin level crossings and antiferromagnetic order in this high-spin antiferromagnetic system. We determined the phase boundaries and spin level crossings using various measurements and calculations, and discovered the multiferroic behavior of magnetically induced electric polarization.
Article
Optics
Xiao-Li Peng, Xu Qiu, Yi Liang, Ai-Yuan Hu, Lin Wen
Summary: In this study, we investigated the motion of bright solitons in one-dimensional spin-1 Bose-Einstein condensates under the influence of spin-tensor-momentum coupling. Our results show that the amplitude, momentum, and center of mass of the solitons are coupled to each other through spin-tensor-momentum coupling and Raman coupling. We found that the motion of the solitons can be viewed as a superposition of linear motion and periodic oscillation, where the velocity of the linear motion and the oscillation frequency are related to the spin-tensor-momentum coupling and Raman coupling.
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
Materials Science, Multidisciplinary
Qingbo Wang, Wenjing Zhao, Linghua Wen
Summary: The study reveals that spin-orbit coupling has a significant influence on the dynamics of kicked pseudo-spin-1/2 Bose-Einstein condensates under different conditions, mainly reflected in the different behaviors of density distribution and energy evolution.
RESULTS IN PHYSICS
(2021)
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
Physics, Multidisciplinary
Mariya Iv Trukhanova, Yuri N. Obukhov
Summary: In this study, a novel model of magnetized spin-1 Bose-Einstein condensate is developed using the method of many-particle quantum hydrodynamic. The dynamics of fluid velocity and magnetization are determined by a nontrivial modification of the Euler and Landau-Lifshitz equations. The properties of dispersion spectrum of collective excitations are described, predicting an anisotropic spin wave instability.
Article
Physics, Applied
Zicun Li, Jinbin Li, Daning Shi
Summary: In this study, the circularly-symmetric phase separation in a spin-1 spin-orbit angular momentum coupled Rb-87 Bose-Einstein condensate (BEC) system was investigated using numerical solutions. The increase of the coupling strength resulted in the formation of annular structures, which exhibited different characteristics compared to the phase separation of a spin and linear momentum coupled BEC. The experimental results supported the findings, and the influence of different parameters on the system was analyzed.
MODERN PHYSICS LETTERS B
(2022)
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
Optics
Gautam Hegde, Sandra M. Jose, Rejish Nath
Summary: This study analyzes the dynamics of population and spin densities in spin-1 spinor condensates resulting from the spatial overlap between two distinct polar bright solitons. The findings show that the dynamics of overlapping solitons in scalar condensates display various phenomena such as soliton fusion, atomic switching, and repulsive dynamics. The study also reveals that overlapping polar solitons can emerge as ferromagnetic solitons, oscillatons, or a combination of both in the presence of spin-dependent interactions.
Article
Physics, Multidisciplinary
Ji Li, Tianchen He, Jing Bai, Bin Liu, Huan-Yu Wang
Summary: By numerically solving the coupled Gross-Pitaevskii equations, this study investigates the ground states of spin-1 Bose-Einstein condensates with spin-orbit coupling in a radially periodic potential. It is found that spin-orbit coupling leads to different phase structures in Bose-Einstein condensates with different spin properties, and the strength of spin-orbit coupling can control the properties of the condensates.
Article
Mathematics, Interdisciplinary Applications
Chunyan Li, Vladimir V. Konotop, Boris A. Malomed, Yaroslav V. Kartashov
Summary: This study reveals the mechanism of linear and nonlinear localization induced by spatially periodic modulation of spin-orbit coupling. It shows that specific chemical potential can lead to localized solitons or vortex solitons, and their stability strongly depends on the potential's location in the gaps.
CHAOS SOLITONS & FRACTALS
(2023)
Article
Mathematics, Interdisciplinary Applications
Hao Zhu, Wen-Kai Bai, Jun-Hui Zheng, Yan-Mei Yu, Lin Zhuang, Wu-Ming Liu
Summary: In this work, the phase transition analysis of binary Bose-Einstein condensates (BECs) with spin-orbit and Rabi couplings in a quasi-two-dimensional system under rotation is presented. The superfluid properties induced by rotation and spin-orbit coupling are investigated using hydrodynamic theory. The study reveals first-order phase transitions and continuous changes in angular momentum. A phase diagram showing the boundary regime in the plane of spin-orbit and Rabi coupling strengths is obtained.
CHAOS SOLITONS & FRACTALS
(2023)
Article
Physics, Multidisciplinary
C. Ravensbergen, E. Soave, V Corre, M. Kreyer, B. Huang, E. Kirilov, R. Grimm
PHYSICAL REVIEW LETTERS
(2020)
Article
Physics, Multidisciplinary
Thomas Chalopin, Tanish Satoor, Alexandre Evrard, Vasiliy Makhalov, Jean Dalibard, Raphael Lopes, Sylvain Nascimbene
Article
Physics, Multidisciplinary
An Qu, Bertrand Evrard, Jean Dalibard, Fabrice Gerbier
PHYSICAL REVIEW LETTERS
(2020)
Article
Physics, Multidisciplinary
Yifan Li, Krzysztof Pawlowski, Boris Decamps, Paolo Colciaghi, Matteo Fadel, Philipp Treutlein, Tilman Zibold
PHYSICAL REVIEW LETTERS
(2020)
Article
Physics, Multidisciplinary
Y-Q Zou, B. Bakkali-Hassani, C. Maury, E. Le Cerf, S. Nascimbene, J. Dalibard, J. Beugnon
PHYSICAL REVIEW LETTERS
(2020)
Article
Physics, Multidisciplinary
Bertrand Evrard, An Qu, Jean Dalibard, Fabrice Gerbier
Summary: The dynamics of a many-body system can exhibit various behaviors, from reversible evolution to thermalization. The linear energy spectrum and undamped oscillations of many-body observables occur when the system can be described by a Bogoliubov analysis, while nonlinearity leads to irreversibility. Chaotic dynamics and thermalization emerge when the integrability of the Hamiltonian is broken, in agreement with the eigenstate thermalization hypothesis paradigm.
PHYSICAL REVIEW LETTERS
(2021)
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
Optics
Y-Q Zou, E. Le Cerf, B. Bakkali-Hassani, C. Maury, G. Chauveau, P. C. M. Castilho, R. Saint-Jalm, S. Nascimbene, J. Dalibard, J. Beugnon
Summary: This study demonstrates the arbitrary control of density profile of a two-dimensional Bose gas by shaping the optical potential applied to the atoms. Using a digital micromirror device (DMD) directly imaged onto the atomic cloud through a high resolution imaging system, the research achieves an optical potential with arbitrary intensity profile and micron-scale resolution. The obtained density distribution is optimized with a feedback loop based on measured absorption images of the cloud, and arbitrary spin distributions are engineered through two-photon Raman transfer between internal ground states using the same device.
JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS
(2021)
Article
Physics, Multidisciplinary
B. Bakkali-Hassani, C. Maury, Y-Q Zou, E. Le Cerf, R. Saint-Jalm, P. C. M. Castilho, S. Nascimbene, J. Dalibard, J. Beugnon
Summary: Researchers prepared solitons deterministically using a two-component Bose gas, confirming the existence of solitonic behavior for a specific value of gN and arbitrary sizes, a hallmark of scale invariance.
PHYSICAL REVIEW LETTERS
(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
Physics, Multidisciplinary
B. Bakkali-Hassani, C. Maury, S. Stringari, S. Nascimbene, J. Dalibard, J. Beugnon
Summary: In this theoretical study, we investigate the non-miscible regime of two Bose-Einstein condensates labeled 1 and 2 in two-dimensional space. We focus on the properties of a localized wave packet formed by the minority component 2 when immersed in an infinite bath formed by component 1. Using coupled classical field equations, we analyze the system at zero temperature and determine the existence of the wave packet above a threshold atom number N (2) corresponding to the Townes soliton state. We also identify the regimes where an effective single-field equation can describe the localized state up to the droplet case where component 2 behaves as an incompressible fluid. We study the near-equilibrium dynamics of the coupled fluids and find specific parameter ranges for the presence of localized excitation modes.
NEW JOURNAL OF PHYSICS
(2023)
Article
Optics
Marian Kreyer, Jeong Ho Han, Cornelis Ravensbergen, Vincent Corre, Elisa Soave, Emil Kirilov, Rudolf Grimm
Summary: In this research, the anisotropic dynamical polarizability of Dy near the 626-nm intercombination line was measured using modulation spectroscopy in a one-dimensional optical lattice. By using K as a reference species, large systematic uncertainties resulting from limited knowledge of spatial intensity distribution were eliminated. The method extracted the scalar and tensorial parts of the polarizability by varying the laser polarization, and the natural linewidth was also derived. The results showed excellent agreement with literature values, and optical dipole trapping on the intercombination line was demonstrated, providing a tool for manipulating atoms in the Dy-K mixture.
Article
Optics
Bertrand Evrard, An Qu, Jean Dalibard, Fabrice Gerbier
Summary: Experiments show the competition between quantum fluctuations and a coherent seed in the dynamics of a spin-1 Bose-Einstein condensate, with the relevance of a mean-field description discussed. Different behaviors are observed depending on the presence of quantum fluctuations and coherent seed, with classical and semiclassical descriptions used to explain the experimental results.
Correction
Optics
Cornelis Ravensbergen, Vincent Corre, Elisa Soave, Marian Kreyer, Emil Kirilov, Rudolf Grimm