---
res:
bibo_abstract:
- 'During the past 70 years, the quantum theory of angular momentum has been successfully
applied to describing the properties of nuclei, atoms, and molecules, and their
interactions with each other as well as with external fields. Because of the properties
of quantum rotations, the angular-momentum algebra can be of tremendous complexity
even for a few interacting particles, such as valence electrons of an atom, not
to mention larger many-particle systems. In this work, we study an example of
the latter: A rotating quantum impurity coupled to a many-body bosonic bath. In
the regime of strong impurity-bath couplings, the problem involves the addition
of an infinite number of angular momenta, which renders it intractable using currently
available techniques. Here, we introduce a novel canonical transformation that
allows us to eliminate the complex angular-momentum algebra from such a class
of many-body problems. In addition, the transformation exposes the problem''s
constants of motion, and renders it solvable exactly in the limit of a slowly
rotating impurity. We exemplify the technique by showing that there exists a critical
rotational speed at which the impurity suddenly acquires one quantum of angular
momentum from the many-particle bath. Such an instability is accompanied by the
deformation of the phonon density in the frame rotating along with the impurity.@eng'
bibo_authorlist:
- foaf_Person:
foaf_givenName: Richard
foaf_name: Schmidt, Richard
foaf_surname: Schmidt
- foaf_Person:
foaf_givenName: Mikhail
foaf_name: Lemeshko, Mikhail
foaf_surname: Lemeshko
foaf_workInfoHomepage: http://www.librecat.org/personId=37CB05FA-F248-11E8-B48F-1D18A9856A87
bibo_doi: 10.1103/PhysRevX.6.011012
bibo_issue: '1'
bibo_volume: 6
dct_date: 2016^xs_gYear
dct_language: eng
dct_publisher: American Physical Society@
dct_title: Deformation of a quantum many-particle system by a rotating impurity@
...