Dephasing dynamics of an impurity coupled to an anharmonic environment

Bramberger, Max und De Vega, Ines (2020): Dephasing dynamics of an impurity coupled to an anharmonic environment. In: Physical Review A, Bd. 101, Nr. 1, 012101

Abstract

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 backflow (as measured by the Breuer-Laine-Piilo non-Markovianity measure). Both dephasing and backflow are particularly significant when the anharmonic potential allows environment states very close to the dissociation limit. In contrast, the information backflow is suppressed when assuming the environment to be Gaussian. In this regard, we find that the Gaussian approximation is particularly poor at low temperatures.

• Dokumententyp: Zeitschriftenartikel
• Fakultät: Physik
• Themengebiete: 500 Naturwissenschaften und Mathematik > 530 Physik
• ISSN: 2469-9926
• Sprache: Englisch