Variational approaches to quantum impurities: from the Fröhlich polaron to the angulon
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Abstract
Problems involving quantum impurities, in which one or a few particles are interacting with a macroscopic environment, represent a pervasive paradigm, spanning across atomic, molecular, and condensed-matter physics. In this paper we introduce new variational approaches to quantum impurities and apply them to the Fröhlich polaron–a quasiparticle formed out of an electron (or other point-like impurity) in a polar medium, and to the angulon–a quasiparticle formed out of a rotating molecule in a bosonic bath. We benchmark these approaches against established theories, evaluating their accuracy as a function of the impurity-bath coupling.
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2019-01-18
Journal Title
Molecular Physics
Publisher
Taylor and Francis
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IST-REx-ID
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2019_MolecularPhysics_Li.pdf
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2019-01-29
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