Stauber, T. and Parida, P. and Trushin, M. and Ulybyshev, M. V. and Boyda, D. L. and Schliemann, J. (2017) Interacting Electrons in Graphene: Fermi Velocity Renormalization and Optical Response. PHYSICAL REVIEW LETTERS, 118 (26): 266801. ISSN 0031-9007, 1079-7114
Full text not available from this repository.Abstract
We have developed a Hartree-Fock theory for electrons on a honeycomb lattice aiming to solve a longstanding problem of the Fermi velocity renormalization in graphene. Our model employs no fitting parameters (like an unknown band cutoff) but relies on a topological invariant (crystal structure function) that makes the Hartree-Fock sublattice spinor independent of the electron-electron interaction. Agreement with the experimental data is obtained assuming static self-screening including local field effects. As an application of the model, we derive an explicit expression for the optical conductivity and discuss the renormalization of the Drude weight. The optical conductivity is also obtained via precise quantum Monte Carlo calculations which compares well to our mean-field approach.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | MINIMAL CONDUCTIVITY; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics Physics > Institute of Theroretical Physics > Chair Professor Grifoni > Group John Schliemann |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 14 Dec 2018 13:10 |
| Last Modified: | 27 Feb 2019 11:17 |
| URI: | https://pred.uni-regensburg.de/id/eprint/666 |
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