Many-body electron correlations in graphene

18th International Conference on Recent Progress in Many-Body Theories

Neilson, David^1 ; Perali, Andrea^1 ; Zarenia, Mohammad^2

Dipartimenti di Fisica e di Farmacia, Universita di Camerino, Camerino (MC)

62032, Italy^1

Department of Physics, University of Antwerp, Antwerpen

B-2020, Belgium^2

关键词: Conduction electrons;    Electron-electron correlation;    Electron-hole correlation;    Graphene multilayers;    Quantum size effects;    Quasi-one dimensional;    Two dimensional electrons;    Van Hove singularities;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/702/1/012008/pdf
DOI  :  10.1088/1742-6596/702/1/012008

来源: IOP

【 摘 要 】

The conduction electrons in graphene promise new opportunities to access the region of strong many-body electron-electron correlations. Extremely high quality, atomically flat two-dimensional electron sheets and quasi-one-dimensional electron nanoribbons with tuneable band gaps that can be switched on by gates, should exhibit new many-body phenomena that have long been predicted for the regions of phase space where the average Coulomb repulsions between electrons dominate over their Fermi energies. In electron nanoribbons a few nanometres wide etched in monolayers of graphene, the quantum size effects and the van Hove singularities in their density of states further act to enhance electron correlations. For graphene multilayers or nanoribbons in a double unit electron-hole geometry, it is possible for the many-body electron-hole correlations to be made strong enough to stabilise high-temperature electron-hole superfluidity.