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Negative Landau Damping in Bilayer Graphene

Morgado, T. A. ; Silveirinha, M. G.

Physical Review Letters Vol. 119, Nº 13, pp. 133901-1 - 133901-6, September, 2017.

ISSN (print): 1079-7114
ISSN (online): 0031-9007

Scimago Journal Ranking: 3,62 (in 2017)

Digital Object Identifier: 10.1103/PhysRevLett.119.133901

We theoretically demonstrate that a system formed by two coupled graphene sheets enables a negative damping regime wherein graphene plasmons are pumped by a direct current. This effect is triggered by electrons drifting through one of the graphene sheets and leads to wave instabilities and a spontaneous light emission (spasing) in the midinfrared range. It is shown that there is a deep link between the drift-induced instabilities and wave instabilities in moving media, as both result from the hybridization of oscillators with oppositely signed frequencies. With a thickness of a few nanometers and wide spectral tunability, the proposed structure may find interesting applications in nanophotonic circuitry as an on-chip light source.