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Quantum coherence in bilayer graphene in the quantum Hall regime
Thierry Jolicoeur (LPTMS, Université Paris-Sud)
Bilayer graphene under a magnetic field has a central octet of quasi-degenerate Landau levels due to spin, valley, and orbital degeneracies. This set of zero-energy Landau level is resolved into several incompressible states whose detailed nature is still elusive. A Hartree-Fock treatment of a realistic tight-binding four-band model can be used to understand the quantum ferromagnetism phenomena expected for integer fillings of the octet levels. I will discuss various phase diagrams as a function of applied bias and magnetic field. In some corners of these diagrams are interesting phases with quantum coherence involving valley or orbital degrees of freedom.
Reference:
- Angelika Knothe and Thierry Jolicoeur, Phase diagram of a graphene bilayer in the zero-energy Landau level, Phys. Rev. B 94, 235149 (2016).