Negative Landau Damping in Bilayer Graphene.
- 26 September 2017
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 119 (13), 133901
- https://doi.org/10.1103/PhysRevLett.119.133901
Abstract
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.Keywords
Funding Information
- Fundação para a Ciência e a Tecnologia (PTDC/EEI-TEL/4543/2014, SFRH/BPD/84467/2012)
- Instituto de Telecomunicações (UID/EEA/50008/2013)
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