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

doi:10.1088/2053-1583/3/4/045009

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

RIEC - Information Communication Platforms Division

Research output: Contribution to journal › Article › peer-review

50 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 language	English
Article number	045009
Journal	2D Materials
Volume	3
Issue number	4
DOIs	https://doi.org/10.1088/2053-1583/3/4/045009
Publication status	Published - 2016 Oct 14

Keywords

Graphene
Laser
Negative differential conductance
Photodetector
Terahertz radiation

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10.1088/2053-1583/3/4/045009

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title = "Terahertz wave generation and detection in double-graphene layered van der Waals heterostructures",

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.",

keywords = "Graphene, Laser, Negative differential conductance, Photodetector, Terahertz radiation",

author = "Deepika Yadav and Tombet, {Stephane Boubanga} and Takayuki Watanabe and Stevanus Arnold and Victor Ryzhii and Taiichi Otsuji",

note = "Funding Information: The authors are grateful to Akira Satou at RIEC, Tohoku University, Japan for the valuable discussions. This work was financially supported in part by JSPS KAKENHI (#23000008, and #16H06361), Japan. VR acknowledges also the support by the Russian Foundation for Basic Research (Grant No.16-29-03033). Publisher Copyright: {\textcopyright} 2016 IOP Publishing Ltd.",

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doi = "10.1088/2053-1583/3/4/045009",

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AU - Yadav, Deepika

AU - Tombet, Stephane Boubanga

AU - Watanabe, Takayuki

AU - Arnold, Stevanus

AU - Ryzhii, Victor

AU - Otsuji, Taiichi

N1 - Funding Information: The authors are grateful to Akira Satou at RIEC, Tohoku University, Japan for the valuable discussions. This work was financially supported in part by JSPS KAKENHI (#23000008, and #16H06361), Japan. VR acknowledges also the support by the Russian Foundation for Basic Research (Grant No.16-29-03033). Publisher Copyright: © 2016 IOP Publishing Ltd.

PY - 2016/10/14

Y1 - 2016/10/14

N2 - 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.

AB - 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.

KW - Graphene

KW - Laser

KW - Negative differential conductance

KW - Photodetector

KW - Terahertz radiation

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

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