Cavity QED of the graphene cyclotron transition

David Hagenmüller (1) , Cristiano Ciuti (1)

1 MPQ (UMR_7162) - Laboratoire Matériaux et Phénomènes Quantiques

We investigate theoretically the cavity quantum electrodynamics of the cyclotron transition for Dirac fermions in graphene. We show that the ultrastrong coupling regime characterized by a vacuum Rabi frequency comparable or even larger than the transition frequency can be obtained for high enough filling factors of the graphene Landau levels. Important qualitative differences occur with respect to the corresponding physics of massive electrons in a semiconductor quantum well. In particular, an instability for the ground state analogous to the one occuring in the Dicke-model is predicted for increasing value of the electron density.

Domaines: Physique Quantique [quant-ph]; Systèmes mésoscopiques et effet Hall quantique [cond-mat.mes-hall]; Autre [cond-mat.other]

David Hagenmüller, Cristiano Ciuti. Cavity QED of the graphene cyclotron transition. 2011. ⟨hal-00641391⟩