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Sub-bandgap voltage electroluminescence and magneto-oscillations in a WSe₂ light-emitting van der Waals heterostructure

Lookup NU author(s): Dr Aleksey KozikovORCiD

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Abstract

We report on experimental investigations of an electrically driven WSe₂ based light-emitting van der Waals heterostructure. We observe a threshold voltage for electroluminescence significantly lower than the corresponding single particle band gap of monolayer WSe₂. This observation can be interpreted by considering the Coulomb interaction and a tunneling process involving excitons, well beyond the picture of independent charge carriers. An applied magnetic field reveals pronounced magneto-oscillations in the electroluminescence of the free exciton emission intensity with a 1/B periodicity. This effect is ascribed to a modulation of the tunneling probability resulting from the Landau quantization in the graphene electrodes. A sharp feature in the differential conductance indicates that the Fermi level is pinned and allows for an estimation of the acceptor binding energy.

Publication metadata

Author(s): Binder J, Withers F, Molas MR, Faugeras C, Nogajewski K, Watanabe K, Taniguchi T, Kozikov A, Geim A, Novoselov K, Potemski M

Publication type: Article

Publication status: Published

Journal: Nano Letters

Year: 2017

Volume: 17

Issue: 3

Pages: 1425-1430

Print publication date: 08/03/2017

Online publication date: 17/02/2017

Acceptance date: 15/02/2017

ISSN (print): 1530-6984

ISSN (electronic): 1530-6992

Publisher: American Chemical Society

URL: https://doi.org/10.1021/acs.nanolett.6b04374

DOI: 10.1021/acs.nanolett.6b04374

PubMed id: 28211273

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