Fröhlich versus Bose-Einstein Condensation in Pumped Bosonic Systems

• URL: http://arxiv.org/abs/2411.00058v1
• Date: Wed, 30 Oct 2024 23:52:10 GMT
• Title: Fröhlich versus Bose-Einstein Condensation in Pumped Bosonic Systems
• Authors: Wenhao Xu, Andrey A. Bagrov, Farhan T. Chowdhury, Luke D. Smith, Daniel R. Kattnig, Hilbert J. Kappen, Mikhail I. Katsnelson,
• Abstract summary: Fr"ohlich-condensation is a hypothesis of Bose-Einstein-like condensation in living systems at ambient temperatures. Here, we elucidate the essential features of magnon-condensation in an open quantum system. Our derived equations of motion for expected magnon occupations turns out to be similar in form to the rate equations governing Fr"ohlich-condensation.
• Score: 0.9243767143022278
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• Abstract: Magnon-condensation, which emerges in pumped bosonic systems at room temperature, continues to garner great interest for its long-lived coherence. While traditionally formulated in terms of Bose-Einstein condensation, which typically occurs at ultra-low temperatures, it could potentially also be explained by Fr\"ohlich-condensation, a hypothesis of Bose-Einstein-like condensation in living systems at ambient temperatures. Here, we elucidate the essential features of magnon-condensation in an open quantum system (OQS) formulation, wherein magnons dissipatively interact with a phonon bath. Our derived equations of motion for expected magnon occupations turns out to be similar in form to the rate equations governing Fr\"ohlich-condensation. Provided that specific system parameters result in correlations amplifying or diminishing the condensation effects, we thereby posit that our treatment offers a better description of high-temperature condensation as opposed to traditional descriptions using equilibrium thermodynamics. By comparing our OQS derivation with the original uncorrelated and previous semi-classical rate equations, we furthermore highlight how both classical anti-correlations and quantum correlations alter the bosonic occupation distribution.

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