Excitation spectra of a Bose-Einstein condensate with an angular spin-orbit coupling

Vasić, Ivana; Balaž, Antun

doi:10.1103/physreva.94.033627

Cited by 17 publications

(12 citation statements)

References 55 publications

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“…ε j is the quasiparticle frequency and the quasiparticle amplitudes K ≡ u (or v) in Eq. (S7) can be written as K jσ (r, φ) = K (l) τ σ (r)r |lz +l| e i(lz+l)φ / √ 2π [28]. Here the index j is defined as j ≡ (l, τ ) with the integer angular momentum l ∈ Z and the branch index τ ∈ N 1 .…”

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confidence: 99%

Spin–Orbital-Angular-Momentum Coupled Bose-Einstein Condensates

et al. 2018

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We demonstrate coupling between the atomic spin- and orbital-angular momentum (OAM) of the atom's center-of-mass motion in a Bose-Einstein condensate (BEC). The coupling is induced by Raman-dressing lasers with a Laguerre-Gaussian beam and creates coreless vortices in an F=1 ^{87}Rb spinor BEC. We observe correlations between spin and OAM in the dressed state and characterize the spin texture; the result is in good agreement with the theory. In the presence of the Raman field, our dressed state is stable for 0.1 s or longer, and it decays due to collision-induced relaxation. As we turn off the Raman beams, the vortex cores in the bare spin |m_{F}=1⟩ and |-1⟩ split. These spin-OAM coupled systems with the Raman-dressing approach have great potential for exploring new topological textures and quantum states.

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confidence: 99%

Spin–Orbital-Angular-Momentum Coupled Bose-Einstein Condensates

et al. 2018

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“…In this case, we generalize the Bogoliubov theory at zero temperature to study low-energy elementary excitations [26,27], including dipole and breathing modes. The transitions between different phases may then be understood from possible instabilities of the collective modes.…”

Section: B Gross-pitaevskii Approach Within the Bogoliubov Approximamentioning

confidence: 99%

“…In addition, ε j is the quasiparticle frequency and the quasiparticle amplitudes K ≡ u (or v) in Eq. (5) can be written as [27]. Here the index j is defined as j ≡ (l, τ ), with the integer angular momentum l ∈ Z and the branch index τ ∈ N 1 .…”

Section: B Gross-pitaevskii Approach Within the Bogoliubov Approximamentioning

confidence: 99%

Angular stripe phase in spin-orbital-angular-momentum coupled Bose condensates

Chen

Peng

Zou

et al. 2020

Phys. Rev. Research

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We propose that a superfluid with supersolidlike properties, i.e., angular stripe phase, can be realized in a pancakelike spin-1/2 Bose gas with spin-orbital-angular-momentum coupling. We predict a rich ground-state phase diagram, including the vortex-antivortex pair phase, the half-skyrmion phase, and two different angular stripe phases. The stripe phases feature a modulated angular density-density correlation with a sizable contrast and can occupy a relatively large parameter space. The low-lying collective excitations, such as the dipole and breathing modes, show distinct behaviors in different phases. The existence of the stripe phase is also clearly indicated in the energetic and dynamic instabilities of collective modes near phase transitions. Our predictions of the angular stripe phase could be readily examined in current cold-atom experiments with 87 Rb and 41 K.

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“…Dynamical properties also play an important role in characterizing spinor BECs. In the past decade, various topological collective excitations including exotic vortex or vortex pair [36][37][38][39][40][41][42][43], soliton [44][45][46][47][48][49][50], knot [51][52][53], skyrmion [54][55][56][57][58][59] have been proposed and their dynamical stability have either been theoretically discussed or experimentally verified in the framework of spinor BECs. Recently, a variety of studies were performed on the dynamics of a scalar BEC flow past an obstacle, especially after the experimental observation of the induced vortex-antivortex pairs [60,61], which have been shown to exhibit extraordinary behaviors [62][63][64][65][66][67][68][69][70].…”

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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Excitation spectra of a Bose-Einstein condensate with an angular spin-orbit coupling

Cited by 17 publications

References 55 publications

Spin–Orbital-Angular-Momentum Coupled Bose-Einstein Condensates

Spin–Orbital-Angular-Momentum Coupled Bose-Einstein Condensates

Angular stripe phase in spin-orbital-angular-momentum coupled Bose condensates

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

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