4.6 Article

Detection of roton and phonon excitations in a spin-orbit-coupled Bose-Einstein condensate with a moving barrier

Journal

PHYSICAL REVIEW A
Volume 106, Issue 1, Pages -

Publisher

AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.106.013302

Keywords

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Funding

  1. Okinawa Institute of Science and Technology Graduate University
  2. National Natural Science Foundation of China [11974235, 11774219]

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We propose a method to detect phonon and roton excitations in a two-dimensional Bose-Einstein condensate with Raman-induced spin-orbit coupling by perturbing the atomic cloud with a weak barrier. The two excitation modes can be observed by moving the barrier along different directions, and phonon excitations are identified by the appearance of solitary waves, while roton excitations lead to distinctive spatial density modulations. We demonstrate that this method can also be used to determine the anisotropic critical velocities of superfluid.
We propose to detect phonon and roton excitations in a two-dimensional Bose-Einstein condensate with Raman-induced spin-orbit coupling by perturbing the atomic cloud with a weak barrier. The two excitation modes can be observed by moving the barrier along different directions in appropriate parameter regimes. Phonon excitations are identified by the appearance of solitary waves, while roton excitations lead to distinctive spatial density modulations. We show that this method can also be used to determine the anisotropic critical velocities of superfluid.

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