Coherent spin mixing via spin-orbit coupling in Bose gases

Cabedo, Josep; Claramunt, Joan; Celi, Alessio; Zhang, Yongping; Ahufinger, V.; Mompart, J.

doi:10.1103/physreva.100.063633

Cited by 7 publications

(10 citation statements)

References 67 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.…”

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confidence: 56%

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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confidence: 56%

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: 57%

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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“…⟩ g is the ground state energy per particle for the single-particle Hamiltonian (17). At zero temperature, this energy corresponds to the minimum of the band (18). For non-interacting fermions, the currents are given by j (f ) 1…”

Section: B Current Distribution In the Triangular Laddermentioning

confidence: 99%

“…In the bulk SOC can stabilize exotic phases like the stripe phase [11,12], where translation invariance is spontaneously broken [13], in analogy with supersolids very recently realized in dipolar gases [14][15][16] (see also [17] for the realization supersolid-like state in a cavity). Under suitable conditions SOC gives also access to beyond-mean-field dynamics in weakly interacting dilute gases [18] (for experimental demonstrations of beyondmean-field effects due to competing interactions see [19][20][21]) by inducing spin changing collisions in F = 1 BEC (see [22]) from SU(3)-symmetric density-density interactions that are controllable. Interestingly, SOC combined with radio-frequency dressing offers a novel mechanism to achieve subwavelength optical lattices [23].…”

Section: Introductionmentioning

confidence: 99%

Effective triangular ladders with staggered flux from spin-orbit coupling in 1D optical lattices

Cabedo,

Claramunt,

Mompart

et al. 2020

Preprint

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Light-induced spin-orbit coupling is a flexible tool to study quantum magnetism with ultracold atoms. In this work we show that spin-orbit coupled Bose gases in a one-dimensional optical lattice can be mapped into a two-leg triangular ladder with staggered flux following a lowest-band truncation of the Hamiltonian. The effective flux and the ratio of the tunneling strengths can be independently adjusted to a wide range of values. We identify a certain regime of parameters where a hard-core boson approximation holds and the system realizes a frustrated triangular spin ladder with tunable flux. We study the properties of the effective spin Hamiltonian using the densitymatrix renormalization-group method and determine the phase diagram at half-filling. It displays two phases: a uniform superfluid and a bond-ordered insulator. The latter can be stabilized only for low Raman detuning. Finally, we provide experimentally feasible trajectories across the parameter space of the SOC system that cross the predicted phase transition.

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Coherent spin mixing via spin-orbit coupling in Bose gases

Cited by 7 publications

References 67 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

Effective triangular ladders with staggered flux from spin-orbit coupling in 1D optical lattices

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