Terahertz wave generation and detection in double-graphene layered van der Waals heterostructures

Deepika Yadav, Stephane Boubanga Tombet, Takayuki Watanabe, Stevanus Arnold, Victor Ryzhii, Taiichi Otsuji

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

We report on the first experimental observation of terahertz emission and detection in a double graphene layered (GL) heterostructure which comprises a thin hexagonal-boron nitride tunnel-barrier layer sandwiched between two separately contacted GLs. Inter-GL population inversion is induced by electrically biasing the structure. Resonant tunneling and negative differential resistance is expected when the two graphene band structures are perfectly aligned. However, in the case of small misalignments we demonstrate that the photon-absorption/emission-assisted non-resonant- and resonant-tunneling causes all excess charges in the n-type GL to recombine with the holes in the p-type GL giving rise to an increased measured dc current. This work highlights a novel strategy for the realization of efficient voltage-tunable terahertz emitters and detectors.

Original languageEnglish
Article number045009
Journal2D Materials
Volume3
Issue number4
DOIs
Publication statusPublished - 2016 Oct 14

Keywords

  • Graphene
  • Laser
  • Negative differential conductance
  • Photodetector
  • Terahertz radiation

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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