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Electrically pumped single-defect light emitters in WSe₂

Lookup NU author(s): Dr Aleksey KozikovORCiD

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This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).

Abstract

Recent developments in fabrication of van der Waals heterostructures enable new type of devices assembled by stacking atomically thin layers of two-dimensional materials. Using this approach, we fabricate light-emitting devices based on a monolayer WSe₂, and also comprising boron nitride tunnelling barriers and graphene electrodes, and observe sharp luminescence spectra from individual defects in WSe₂ under both optical and electrical excitation. This paves the way towards the realisation of electrically-pumped quantum emitters in atomically thin semiconductors. In addition we demonstrate tuning by more than 1 meV of the emission energy of the defect luminescence by applying a vertical electric field. This provides an estimate of the permanent electric dipole created by the corresponding electron-hole pair. The light-emitting devices investigated in our work can be assembled on a variety of substrates enabling a route to integration of electrically pumped single quantum emitters with existing technologies in nano-photonics and optoelectronics.

Publication metadata

Author(s): Schwarz S, Kozikov A, Withers F, Maguire JK, Foster AP, Dufferwiel S, Hague L, Makhonin MN, Wilson LR, Geim A, Novoselov K, Tartakovskii AI

Publication type: Article

Publication status: Published

Journal: 2D Materials

Year: 2016

Volume: 3

Issue: 2

Online publication date: 27/06/2016

Acceptance date: 10/06/2016

Date deposited: 19/06/2020

ISSN (electronic): 2053-1583

Publisher: Institute of Physics Publishing Ltd.

URL: https://doi.org/10.1088/2053-1583/3/2/025038

DOI: 10.1088/2053-1583/3/2/025038

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