Bogoliubov spectrum and the dynamic structure factor in a quasi-two-dimensional spin-orbit coupled BEC

TL;DR

This paper analyzes the excitation spectrum and dynamic structure factor of a quasi-two-dimensional spin-orbit coupled Bose-Einstein condensate, revealing features that can be experimentally observed via Bragg spectroscopy.

Contribution

It provides the first detailed calculation of the Bogoliubov spectrum and dynamic structure factor in a trapped SOC-BEC, highlighting finite-momentum minima and experimental signatures.

Findings

Excitation spectrum shows minima at finite momentum in immiscible phase

Dynamic structure factor reveals distinctive features in density and pseudo-spin sectors

Results are relevant for experimental Bragg spectroscopy measurements

Abstract

We compute the the Bogoliubov-de-Gennes excitation spectrum in a trapped two-component spin-orbit-coupled (SOC) Bose-Einstein condensate (BEC) in quasi-two-dimensions as a function of linear and angular momentum and analyse them. The excitation spectrum exhibits a minima-like feature at finite momentum for the immiscible SOC-BEC configuration. We augment these results by computing the dynamic structure factor in the density and pseudo-spin sector, and discuss its interesting features that can be experimentally measured through Bragg spectroscopy of such ultra cold-condensate.