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Review Article

Opto-valleytronics in the 2D van der Waals heterostructure

Abdullah Rasmita1, Wei-bo Gao1,2( )
Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore
The Photonics Institute and Centre for Disruptive Photonic Technologies, Nanyang Technological University, Singapore 637371, Singapore
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Abstract

The development of information processing devices with minimum carbon emission is crucial in this information age. One of the approaches to tackle this challenge is by using valleys (local extremum points in the momentum space) to encode the information instead of charges. The valley information in some material such as monolayer transition metal dichalcogenide (TMD) can be controlled by using circularly polarized light. This opens a new field called opto-valleytronics. In this article, we first review the valley physics in monolayer TMD and two-dimensional (2D) heterostructure composed of monolayer TMD and other materials. Such 2D heterostructure has been shown to exhibit interesting phenomena such as interlayer exciton, magnetic proximity effect, and spin-orbit proximity effect, which is beneficial for opto-valleytronics application. We then review some of the optical valley control methods that have been used in the monolayer TMD and the 2D heterostructure. Finally, a summary and outlook of the 2D heterostructure opto-valleytronics are given.

Keywords

opto-valleytronicstwo-dimensional (2D) heterostructureinterlayer excitontransition metal dichalcogenideproximity effect

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Nano Research
Volume 14 Issue 6,
June 2021
Pages 1901-1911
DOI: 10.1007/s12274-020-3036-x
Cite this article:
Rasmita A, Gao W-b. Opto-valleytronics in the 2D van der Waals heterostructure. Nano Research, 2021, 14(6): 1901-1911. https://doi.org/10.1007/s12274-020-3036-x
Topics:
MonolayersSpin orbit couplingTransition metalsVan der Waals forces
Part of a topical collection:
NR45 Awards in 2D Materials, 2021

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Received: 10 June 2020
Revised: 31 July 2020
Accepted: 04 August 2020
Published: 12 September 2020
© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature
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