Novel dynamical resonances in finite-temperature Bose–Einstein condensates

DOI10.1098/RSPA.2005.1543zbMATH Open1370.82028arXivcond-mat/0503561OpenAlexW2161685044MaRDI QIDQ5428329

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Publication date: 21 November 2007

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Abstract: We describe a variety of intriguing mode-coupling effects which can occur in a confined Bose-Einstein condensed system at finite temperature. These arise from strong interactions between a condensate fluctuation and resonances of the thermal cloud yielding strongly non-linear behaviour. We show how these processes can be affected by altering the aspect ratio of the trap, thereby changing the relevant mode-matching conditions. We illustrate how direct driving of the thermal cloud can lead to significant shifts in the excitation spectrum for a number of modes and provide further experimental scenarios in which the dramatic behaviour observed for the $m=0$ mode at JILA (Jin {it et al.} 1997) can be repeated. Our theoretical description is based on a successful second-order finite-temperature quantum field theory which includes the full coupled dynamics of the condensate and thermal cloud and all relevant finite-size effects.

Full work available at URL: https://arxiv.org/abs/cond-mat/0503561

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