Opto-valleytronics in the 2D van der Waals heterostructure

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...

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Bibliographic Details
Published in:Nano research 2021-06, Vol.14 (6), p.1901-1911
Main Authors: Rasmita, Abdullah, Gao, Wei-bo
Format: Article
Language:English
Subjects:
Atomic/Molecular Structure and Spectra
Biomedicine
Biotechnology
Chemistry and Materials Science
Circular polarization
Condensed Matter Physics
Control methods
Data processing
Excitons
Heterostructures
Information processing
Interlayers
Magnetic fields
Materials Science
Monolayers
Nanotechnology
Optical properties
Physics
Polarized light
Review Article
Transition metal compounds
Valleys
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Summary: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.
ISSN:1998-0124
1998-0000
DOI:10.1007/s12274-020-3036-x