Publication
Title
Diagrammatic Monte Carlo study of the acoustic and the Bose-Einstein condensate polaron
Author
Abstract
 We consider two large polaron systems that are described by a Fröhlich type of Hamiltonian, namely the BoseEinstein condensate (BEC) polaron in the continuum and the acoustic polaron in a solid. We present ground-state energies of these two systems calculated with the Diagrammatic Monte Carlo (DiagMC) method and with a Feynman all-coupling approach. The DiagMC method evaluates up to very high order a diagrammatic series for the polaron's self-energy. The Feynman all-coupling approach is a variational method that has been used for a wide range of polaronic problems. For the acoustic and BEC polaron both methods provide remarkably similar non-renormalized ground-state energies that are obtained after introducing a finite momentum cutoff. For the renormalized ground-state energies of the BEC polaron, there are relatively large discrepancies between the DiagMC and the Feynman predictions. These differences can be attributed to the renormalization procedure for the contact interaction.
Language
English
Source (journal)
New journal of physics / Institute of Physics; German Physical Society. - Bristol
Publication
Bristol : 2015
ISSN
1367-2630
Volume/pages
17(2015), 12 p.
Article Reference
033023
ISI
000352900800004
Medium
E-only publicatie
Full text (Publishers DOI)
Full text (open access)
UAntwerpen
 Faculty/Department Research group Publication type Subject Affiliation Publications with a UAntwerp address
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