Séminaire du LPTMS: Thierry Jolicoeur

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.

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Date/Time : 17/10/2017 - 11:00 - 12:00

Location : LPTMS, salle 201, 2ème étage, Bât 100, Campus d'Orsay

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