Journal
MOLECULAR PHYSICS
Volume 117, Issue 15-16, Pages 1981-1988Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/00268976.2019.1567852
Keywords
Quantum impurity; quasiparticle; variational approach; molecular rotations; polaron; angulon
Funding
- Austrian Science Fund (FWF) [P29902] Funding Source: Austrian Science Fund (FWF)
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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 Frohlich 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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