Publication:
Quantum-geometric perspective on spin-orbit-coupled Bose superfluids

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Subaşı, A.L.

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Publication Date

2022

Language

English

Type

Journal Article

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Abstract

We employ the Bogoliubov approximation to study how the quantum geometry of the helicity states affects the superfluid properties of a spin-orbit-coupled Bose gas in continuum. In particular we derive the low-energy Bogoliubov spectrum for a plane-wave condensate in the lower helicity band and show that the geometric contributions to the sound velocity are distinguished by their linear dependences on the interaction strength; that is, they are in sharp contrast to the conventional contribution which has a square-root dependence. We also discuss the roton instability of the plane-wave condensate against the stripe phase and determine their phase-transition boundary. In addition we derive the superfluid density tensor by imposing a phase twist on the condensate order parameter and study the relative importance of its contribution from the interband processes that is related to the quantum geometry.

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Source:

Physical Review A

Publisher:

American Physical Society (APS)

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Subject

Optics, Physics, atomic, molecular and chemical

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