Author(s):

Bighin, Giacomo; Tscherbul, Timur V; Lemeshko, Mikhail P

Article Title: 
Diagrammatic Monte Carlo approach to angular momentum in quantum manyparticle systems

Affiliation 
IST Austria 
Abstract: 
We introduce a diagrammatic Monte Carlo approach to angular momentum properties of quantum manyparticle systems possessing a macroscopic number of degrees of freedom. The treatment is based on a diagrammatic expansion that merges the usual Feynman diagrams with the angular momentum diagrams known from atomic and nuclear structure theory, thereby incorporating the nonAbelian algebra inherent to quantum rotations. Our approach is applicable at arbitrary coupling, is free of systematic errors and of finitesize effects, and naturally provides access to the impurity Green function. We exemplify the technique by obtaining an allcoupling solution of the angulon model; however, the method is quite general and can be applied to a broad variety of systems in which particles exchange quantum angular momentum with their manybody environment.

Journal Title:

Physical Review Letters

Volume: 
121

Issue 
16

ISSN:

10797114

Publisher:

American Physical Society

Date Published:

20181016

Start Page: 
Article number: 165301

DOI: 
10.1103/PhysRevLett.121.165301

Open access: 
no 