Active magneto-optical control of spontaneous emission in graphene

Kort-Kamp, W.J.M., Amorim, B., Bastos, G., Pinheiro, F.A., Rosa, F.S.S., Peres, N.M.R. and Farina, C. (2015) Active magneto-optical control of spontaneous emission in graphene. Physical Review B, 92 (20), 1-9. (doi:10.1103/PhysRevB.92.205415).

Abstract

We investigate the spontaneous emission rate of a two-level quantum emitter near a graphene-coated substrate under the influence of an external magnetic field or strain induced pseudomagnetic field. We demonstrate that the application of the magnetic field can substantially increase or decrease the decay rate. We show that a suppression as large as 99% in the Purcell factor is achieved even for moderate magnetic fields. The emitter's lifetime is a discontinuous function of |B|, which is a direct consequence of the occurrence of discrete Landau levels in graphene. We demonstrate that, in the near-field regime, the magnetic field enables an unprecedented control of the decay pathways into which the photon/polariton can be emitted. Our findings strongly suggest that a magnetic field could act as an efficient agent for on-demand, active control of light-matter interactions in graphene at the quantum level.

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