Many-body effects on graphene conductivity: Quantum Monte Carlo calculations
Publication year
2016Number of pages
7 p.
Source
Physical Review B, 94, 8, (2016), pp. 7-14ISSN
Publication type
Article / Letter to editor

Display more detailsDisplay less details
Organization
Theory of Condensed Matter
Journal title
Physical Review B
Volume
vol. 94
Issue
iss. 8
Page start
p. 7
Page end
p. 14
Subject
Theory of Condensed MatterAbstract
Optical conductivity of graphene is studied using quantum Monte Carlo calculations. We start from a Euclidean current- current correlator and extract sigma(omega) from Green-Kubo relations using the Backus-Gilbert method. Calculations were performed both for long-range interactions and taking into account only the contact term. In both cases we vary interaction strength and study its influence on optical conductivity. We compare our results with previous theoretical calculations choosing omega approximate to kappa, thus working in the region of the plateau in sigma(omega) which corresponds to optical conductivity of Dirac quasiparticles. No dependence of optical conductivity on interaction strength is observed unless we approach the antiferromagnetic phase transition in the case of an artificially enhanced contact term. Our results strongly support previous theoretical studies that claimed very weak regularization of graphene conductivity.
This item appears in the following Collection(s)
- Academic publications [227881]
- Electronic publications [107344]
- Faculty of Science [33782]
- Open Access publications [76465]
Upload full text
Use your RU credentials (u/z-number and password) to log in with SURFconext to upload a file for processing by the repository team.