Dynamical variational approach to Bose polarons at finite temperatures

David Dzsotjan; Richard Schmidt; Michael Fleischhauer

doi:10.1103/physrevlett.124.223401

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arXiv · 1909.12856

Dynamical variational approach to Bose polarons at finite temperatures

David Dzsotjan·Richard Schmidt·Michael Fleischhauer

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Abstract

We discuss the interaction of a mobile quantum impurity with a Bose-Einstein condensate of atoms at finite temperature. To describe the resulting Bose polaron formation we extend the dynamical variational approach of [Phys.Rev.Lett. 117, 11302 (2016)] to an initial thermal gas of Bogoliubov phonons. We study the polaron formation after switching on the interaction, e.g., by a radio-frequency (RF) pulse from a non-interacting to an interacting state. To treat also the strongly-interacting regime, interaction terms beyond the Fr\"ohlich model are taken into account. We calculate the real-time impurity Green's function and discuss its temperature dependence. Furthermore, we determine the RF absorption spectrum and find good agreement with recent experimental observations. We predict temperature-induced shifts and a substantial broadening of spectral lines. The analysis of the real-time Green's function reveals a crossover to a linear temperature dependence of the thermal decay rate of Bose polarons as unitary interactions are approached.

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BibTeX RIS

David Dzsotjan, Richard Schmidt, Michael Fleischhauer. 2019-09-27. Dynamical variational approach to Bose polarons at finite temperatures. https://doi.org/10.1103/physrevlett.124.223401

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