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arXiv · 2608.27898

Microscopic Theory of Drag in a Bose Condensate Interacting with a Moving Reservoir

Hassan Alnatah·Shuang Liang·Shouvik Mukherjee·Qi Yao·Ashton S. Bradley·David W. Snoke
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Abstract

We derive a microscopic theory of drag for a Bose-Einstein condensate interacting with a moving reservoir. Starting from interactions between a condensate and a drifting fermionic bath, we integrate out the bath degrees of freedom within the Born--Markov approximation to obtain an effective Gross--Pitaevskii equation with a drag potential. From this potential we derive an effective drag force and obtain a closed expression for the drag coefficient, determined by the reservoir density fluctuations and the condensate density profile. As an application, we simulate the drag for an exciton--polariton condensate interacting with a drifting electron gas.

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Hassan Alnatah, Shuang Liang, Shouvik Mukherjee, Qi Yao, Ashton S. Bradley, David W. Snoke. 2026-08-28. Microscopic Theory of Drag in a Bose Condensate Interacting with a Moving Reservoir. https://arxiv.org/abs/2608.27898

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