Valley-Dependent Interlayer Excitons in Magnetic WSe2/CrI3.
Nano Lett
; 21(12): 5173-5178, 2021 Jun 23.
Article
em En
| MEDLINE
| ID: mdl-34077218
ABSTRACT
Heterostructures of two-dimensional transition-metal dichalcogenides and ferromagnetic substrates are important candidates for the development of viable new spin- or valleytronic devices. For the prototypical bilayer of WSe2 on top of a ferromagnetic layer of CrI3, we find substantially different coupling of both WSe2 K-valleys to the sublayer. Besides an energy splitting of a few meV, the corresponding excitons have significantly different interlayer character with charge transfer allowed at the KÌ
- point but forbidden at KÌ
+. The different exciton wave functions result in a distinctly different response to magnetic fields with g factors of about -4.4 and -4.0, respectively. By means of ab initio GW/Bethe-Salpeter equation calculations, these findings establish g factors as tool for investigating the exciton character and shedding light on the detailed quantum-mechanical interplay of magnetic and optical properties which are essential for the targeted development of optoelectronic devices.
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MEDLINE
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En
Ano de publicação:
2021
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Article