Nematic-Orbit Coupling and Nematic Density Waves in Spin-1 Condensates

Lao, Di; Raman, Chandra; Melo, C. A. R. Sá de

doi:10.1103/physrevlett.124.173203

Cited by 9 publications

(7 citation statements)

References 46 publications

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“…Several authors have suggested a connection between spinor gases with spin-changing collisions and SOC BECs [37][38][39][40][41][42][43][44]. In this work, we show analytically that the Raman-dressed spin-1 SOC gas at low energy is equivalent, for weak Raman coupling and interactions, and zero total magnetization, to an artificial spin-1 gas with tunable spin-changing collisions.…”

mentioning

confidence: 55%

Excited-state quantum phase transitions in spin-orbit-coupled Bose gases

Cabedo

Celi

2021

Phys. Rev. Research

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In spinor Bose-Einstein condensates, spin-changing collisions are a remarkable proxy to coherently realize macroscopic many-body quantum states. These processes have been, e.g., exploited to generate entanglement, to study dynamical quantum phase transitions, and proposed for realizing nematic phases in atomic condensates. In the same systems dressed by Raman beams, the coupling between spin and momentum induces a spin dependence in the scattering processes taking place in the gas. Here we show that, at weak couplings, such modulation of the collisions leads to an effective Hamiltonian which is equivalent to the one of an artificial spinor gas with spin-changing collisions that are tunable with the Raman intensity. By exploiting this dressed-basis description, we propose a robust protocol to coherently drive the spin-orbit coupled condensate into the ferromagnetic stripe phase via crossing an excited-state quantum phase transition of the effective low-energy model.

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mentioning

confidence: 55%

Excited-state quantum phase transitions in spin-orbit-coupled Bose gases

Cabedo

Celi

2021

Phys. Rev. Research

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“…Several authors have suggested a connection between spinor gases with spin-changing collisions and SOC BECs [12,[25][26][27][28][29][30][31]. In this work, we show analytically that the Raman-dressed spin-1 SOC gas at low energy is equivalent, for weak Raman coupling and interactions, and zero total magnetization, to an artificial spin-1 gas with tun- able spin-changing collisions.…”

mentioning

confidence: 56%

Dynamical preparation of stripe states in spin-orbit-coupled gases

2021

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In spinor Bose-Einstein condensates, spin-changing collisions are a remarkable proxy to coherently realize macroscopic many-body quantum states. These processes have been, e.g., exploited to generate entanglement, to study dynamical quantum phase transitions, and proposed for realizing nematic phases in atomic condensates. In the same systems dressed by Raman beams, the coupling between spin and momentum induces a spin dependence in the scattering processes taking place in the gas. Here we show that, at weak couplings, such modulation of the collisions leads to an effective Hamiltonian which is equivalent to the one of an artificial spinor gas with spin-changing collisions that are tunable with the Raman intensity. By exploiting this dressed-basis description, we propose a robust protocol to coherently drive the spin-orbit-coupled condensate into the ferromagnetic stripe phase via crossing a quantum phase transition of the effective low-energy model in an excited state.

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“…Apart from various novel ground states such as half-quantum vortex [5][6][7][8], stripe phase [6,[9][10][11][12][13][14][15][16]and vortex related structures [17,18], the introduction of SO coupling has led to many other possibilities of topological textures including skyrmions [17,[19][20][21], meron [22][23][24] and monopoles [25,26]. Recently, relevant work has been extended to SO induced supersolid phase [27][28][29], spintensor-momentum coupling [30] , spin-nematic-orbit coupling [31] and another fundamental type, namely, the coupling between spin and orbital angular momentum of atoms [32,33], where phenomena like the splitting of vortex cores [34] and the first-order phase transitions [35] have been observed experimentally.…”

Section: Introductionmentioning

confidence: 99%

Spin-orbit coupled spin-1 Bose-Einstein condensate flow past an obstacle in the presence of a Zeeman field

Zhu,

Pan,

2020

Preprint

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We study the dynamics of a Rashba spin-orbit coupled spin-1 ferromagnetic Bose-Einstein condensate under a linear Zeeman magnetic field(ZF) disturbed by a moving obstacle. The Bogoliubov excitation spectrums and corresponding critical excitations in different situations are analyzed. The structure of the coreless vortex or antivortex generated by the moving obstacle has been investigated. When the ZF is applied along x direction, the vortex cores for the three components of a(an) vortex(antivortex) could be arranged into a vertical line, and their order would be reversed as the spin-orbit coupling increases. When the ZF is parallel to z direction, a skyrmion-like vortex ground state could be induced even by a static obstacle. This topological structure is also found to be dynamically stable if the obstacle is moving at a relatively small velocity.

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Nematic-Orbit Coupling and Nematic Density Waves in Spin-1 Condensates

Cited by 9 publications

References 46 publications

Excited-state quantum phase transitions in spin-orbit-coupled Bose gases

Excited-state quantum phase transitions in spin-orbit-coupled Bose gases

Dynamical preparation of stripe states in spin-orbit-coupled gases

Spin-orbit coupled spin-1 Bose-Einstein condensate flow past an obstacle in the presence of a Zeeman field

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