Anisotropic dynamics of a spin-orbit coupled Bose-Einstein condensate
arXiv:1207.6804 · doi:10.1103/PhysRevA.86.063621
Abstract
By calculating the density response function we identify the excitation spectrum of a Bose-Einstein condensate with equal Rashba and Dresselhaus spin-orbit coupling. We find that the velocity of sound along the direction of spin-orbit coupling is deeply quenched and vanishes when one approaches the second-order phase transition between the plane wave and the zero momentum quantum phases. We also point out the emergence of a roton minimum in the excitation spectrum for small values of the Raman coupling, providing the onset of the transition to the stripe phase. Our findings point out the occurrence of a strong anisotropy in the dynamic behavior of the gas. A hydrodynamic description accounting for the collective oscillations in both uniform and harmonically trapped gases is also derived.
9 pages, 5 figures, extended version of the previous publication (v1)
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Cited by in corpus (19)
- Degenerate Quantum Gases with Spin-Orbit Coupling
- Quantum Spin Dimers from Chiral Dissipation in Cold-Atom Chains
- Softening of Roton and Phonon Modes in a Bose-Einstein Condensate with Spin-Orbit Coupling
- Roton-Maxon Excitation Spectrum of Bose Condensates in a Shaken Optical Lattice
- Measurement of collective excitations in a spin-orbit-coupled Bose-Einstein condensate
- Collapse of spin-orbit coupled Bose-Einstein condensates
- Approach for making visible and stable stripes in a spin-orbit-coupled Bose-Einstein superfluid
- Thermal Phase Transitions of Strongly Correlated Bosons with Spin-Orbit Coupling
- Ground State Properties of Spin-Orbit Coupled Bose Gases for Arbitrary Interactions
- Dynamical generation of dark solitons in spin-orbit-coupled Bose-Einstein condensates
- Superfluid Breakdown and Multiple Roton Gaps in Spin-Orbit Coupled Bose-Einstein Condensates on an Optical Lattice
- Interference of spin-orbit coupled Bose-Einstein condensates
- Dynamics of a macroscopic spin qubit in spin-orbit coupled Bose-Einstein condensates
- Edge binding of sine-Gordon solitons in spin-orbit coupled Bose-Einstein condensates
- Landau's criterion for an anisotropic Bose-Einstein condensate
- Quantum Phases of Two-Component Bosons with Spin-Orbit Coupling in Optical Lattices
- Macroscopic random Paschen-Back effect in ultracold atomic gases
- Polarization of a quasi two-dimensional repulsive Fermi gas with Rashba spin-orbit coupling: a variational study
- Entanglement and dynamical phase transition in a spin-orbit-coupled Bose-Einstein condensate