Anomalous screening of quantum impurities by a neutral environment Journal Article

Author(s): Yakaboylu, Enderalp; Lemeshko, Mikhail
Article Title: Anomalous screening of quantum impurities by a neutral environment
Affiliation IST Austria
Abstract: It is a common knowledge that an e ective interaction of a quantum impurity with an electromagnetic field can be screened by surrounding charge carriers, whether mobile or static. Here we demonstrate that very strong, ‘anomalous’ screening can take place in the presence of a neutral, weakly-polarizable environment, due to an exchange of orbital angular momentum between the impurity and the bath. Furthermore, we show that it is possible to generalize all phenomena related to isolated impurities in an external field to the case when a many-body environment is present, by casting the problem in terms of the angulon quasiparticle. As a result, the relevant observables such as the e ective Rabi frequency, geometric phase, and impurity spatial alignment are straightforward to evaluate in terms of a single parameter: the angular-momentum-dependent screening factor.
Journal Title: Physical Review Letters
Volume: 118
ISSN: 1079-7114
Publisher: American Physical Society  
Date Published: 2017-02-22
Start Page: Article number: 085302
DOI: 10.1103/PhysRevLett.118.085302
Notes: We are grateful to G. Bighin, A. Deuchert, D. Forkert, S. Meuren, B. Midya, and R. Schmidt for valuable discussions. E. Y. acknowledges financial support received from the People Programme (Marie Curie Actions) of the European Union’s Seventh Framework Programme (FP7/2007-2013) under REA Grant Agreement No. 291734. This work was supported by the Austrian Science Fund (FWF), Project No. P29902-N27.
Open access: yes (repository)