Séminaire du LPTMS: Thierry Jolicoeur


11:00 - 12:00

LPTMS, salle 201, 2ème étage, Bât 100, Campus d'Orsay
15 Rue Georges Clemenceau, Orsay, 91405

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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.


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