Boyda, D. L. and Braguta, V. V. and Katsnelson, M. I. and Ulybyshev, M. V. (2016) Many-body effects on graphene conductivity: Quantum Monte Carlo calculations. PHYSICAL REVIEW B, 94 (8): 085421. ISSN 2469-9950, 2469-9969
Full text not available from this repository. (Request a copy)Abstract
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.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | MINIMAL CONDUCTIVITY; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 05 Apr 2019 09:46 |
| Last Modified: | 05 Apr 2019 09:46 |
| URI: | https://pred.uni-regensburg.de/id/eprint/3468 |
Actions (login required)
 |
View Item |
