Dephasing dynamics of an impurity coupled to an anharmonic environment

We analyze the dephasing dynamics of an impurity coupled to an anharmonic environment. We show that a strong anharmonicity produces two different effects depending on the environment temperature: for high temperatures, the system suffers a strong dephasing, while for low temperatures there is a stro...

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Bibliographic Details
Published inarXiv.org
Main Authors Bramberger, Max, De Vega, Inés
Format Paper Journal Article
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 03.11.2021
Subjects
Anharmonicity
Impurities
Physics - Quantum Physics
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Summary:We analyze the dephasing dynamics of an impurity coupled to an anharmonic environment. We show that a strong anharmonicity produces two different effects depending on the environment temperature: for high temperatures, the system suffers a strong dephasing, while for low temperatures there is a strong information back-flow (as measured by the Breuer-Laine-Piilo (BLP) non-Markovianity measure). Both dephasing and back-flow are particularly significant when the anharmonic potential allows environment states very close to the dissociation limit. In contrast, the information back-flow is suppressed when assuming the environment to be Gaussian. In this regard, we find that the Gaussian approximation is particularly poor at low temperatures.
ISSN:2331-8422
DOI:10.48550/arxiv.1907.07360