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Electron-Hole Asymmetry of Surface States in Topological Insulator Sb2Te3 Thin Films Revealed by Magneto-Infrared Spectroscopy
- Source :
- Nano Lett. 20 (6), 4588-4593 (2020)
- Publication Year :
- 2020
-
Abstract
- When surface states (SSs) form in topological insulators (TIs), they inherit the properties of bulk bands, including the electron-hole (e-h) asymmetry but with much more profound impacts. Here, via combining magneto-infrared spectroscopy with theoretical analysis, we show that e-h asymmetry significantly modifies the SS electronic structures when interplaying with the quantum confinement effect. Compared to the case without e-h asymmetry, the SSs now bear not only a band asymmetry as that in the bulk but also a shift of the Dirac point relative to the bulk bands and a reduction of the hybridization gap up to 70%. Our results signify the importance of e-h asymmetry in band engineering of TIs in the thin film limit.<br />Comment: 10 pages,6 figures, including supporting information. Submission version. Added two references and revised acknowledgment. Accepted in Nano Lett
Details
- Database :
- arXiv
- Journal :
- Nano Lett. 20 (6), 4588-4593 (2020)
- Publication Type :
- Report
- Accession number :
- edsarx.2004.01244
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1021/acs.nanolett.0c01447