Plasmons in tunnel-coupled graphene layers: Backward waves with quantum cascade gain

D. Svintsov, Zh Devizorova, T. Otsuji, V. Ryzhii

Research output: Contribution to journalArticlepeer-review

23 Citations (Scopus)

Abstract

We theoretically demonstrate that graphene-insulator-graphene tunnel structures can serve as plasmonic gain media due to the possibility of stimulated electron tunneling accompanied by emission of plasmons under application of interlayer voltage. The probability of plasmon-assisted tunneling is resonantly large at certain values of frequency and interlayer voltage corresponding to the transitions between chiral electron states with collinear momenta, which is a feature unique to the linear bands of graphene. The plasmon dispersion develops an anticrossing with the resonances in tunnel conductivity and demonstrates negative group velocity in several frequency ranges.

Original languageEnglish
Article number115301
JournalPhysical Review B
Volume94
Issue number11
DOIs
Publication statusPublished - 2016 Sep 6

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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