1. Electron-Hole Asymmetry of Surface States in Topological Insulator Sb2Te3 Thin Films Revealed by Magneto-Infrared Spectroscopy
- Author
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Jiang, Yuxuan, Asmar, Mahmoud M., Han, Xingyue, Ozerov, Mykhalo, Smirnov, Dmitry, Salehi, Maryam, Oh, Seongshik, Jiang, Zhigang, Tse, Wang-Kong, and Wu, Liang
- Subjects
Condensed Matter - Materials Science ,Condensed Matter - Mesoscale and Nanoscale Physics - 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., Comment: 10 pages,6 figures, including supporting information. Submission version. Added two references and revised acknowledgment. Accepted in Nano Lett
- Published
- 2020
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