Rostock 2019 – scientific programme

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MO: Fachverband Molekülphysik

MO 21: Coupled Systems

MO 21.7: Talk

Thursday, March 14, 2019, 15:45–16:00, S HS 001 Biologie

variational approaches to quantum impurities: from the Fröhlich polaron to the angulon — •xiang li, giacomo bighin, enderalp yakaboylu, and mikhail lemeshko — Institute of Science and Technology Austria, Klosterneuburg, Austria

In this contribution we introduce new variational approaches, termed as single phonon expansion, coherent state on top of single phonon excitation, and Pekar diagonalization, 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.

[1] X. Li, G. Bighin, E. Yakaboylu, M. Lemeshko, arXiv: 1810.10302