Exciton effect on shift current in single-walled boron-nitride nanotubes

In the present paper, we investigate the exciton effect on the shift current in single-walled boron-nitride nanotubes using effective mass theory combined with the Bethe-Salpeter equation to include the exciton effect. We found that the shift current is enhanced by the exciton effect compared to tha...

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Bibliographic Details
Published in:Physical review. B 2021-02, Vol.103 (7), p.1, Article 075402
Main Author: Konabe, Satoru
Format: Article
Language:English
Subjects:
Bethe-Salpeter equation
Excitons
Free electrons
Holes (electron deficiencies)
Nanotubes
Nitrides
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Summary:In the present paper, we investigate the exciton effect on the shift current in single-walled boron-nitride nanotubes using effective mass theory combined with the Bethe-Salpeter equation to include the exciton effect. We found that the shift current is enhanced by the exciton effect compared to that of free electron-hole pairs and that the direction of the shift current is determined by the chiral index of the nanotube even in the presence of excitons. We provide a simple explanation of why the chiral index determines the direction of the shift current from a bond structure viewpoint via the Rice-Mele model.
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.103.075402