Critical slowdown of non-equilibrium polaron dynamics
| Autor: | Luis A. Peña Ardila, Georg M. Bruun, Thomas Pohl, Kristian Knakkergaard Nielsen |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Physics
Condensed Matter::Quantum Gases Quantum decoherence Non-equilibrium many-body systems Condensed matter physics Slowdown Quantum dynamics Polarons General Physics and Astronomy FOS: Physical sciences Impurity-bath decoherence Polaron Ultracold atom Impurity Quantum Gases (cond-mat.quant-gas) Master equation Quantum gases Condensed Matter::Strongly Correlated Electrons Condensed Matter - Quantum Gases Quantum |
| Zdroj: | Nielsen, K K, Ardila, L A P, Bruun, G M & Pohl, T 2019, ' Critical slowdown of non-equilibrium polaron dynamics ', New Journal of Physics, vol. 21, 043014 . https://doi.org/10.1088/1367-2630/ab0a81 |
| DOI: | 10.1088/1367-2630/ab0a81 |
| Popis: | We study the quantum dynamics of a single impurity following its sudden immersion into a Bose-Einstein condensate. The ensuing formation of the Bose polaron in this general setting can be seen as impurity decoherence driven by the condensate, which we describe within a master equation approach. We derive rigorous analytical results for this decoherence dynamics, and thereby reveal distinct stages of its evolution from a universal stretched exponential initial relaxation to the final approach to equilibrium. The associated polaron formation time exhibits a strong dependence on the impurity speed and is found to undergo a critical slowdown around the speed of sound of the condensate. This rich non-equilibrium behaviour of quantum impurities is of direct relevance to recent cold atom experiments, in which Bose polarons are created by a sudden quench of the impurity-bath interaction. Comment: 25 pages, 10 figures |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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