Electron-Hole Asymmetry of Surface States in Topological Insulator Sb2Te3 Thin Films Revealed by Magneto-Infrared Spectroscopy

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.

arXiv comment10 pages,6 figures, including supporting information. Submission version. Added two references and revised acknowledgment. Accepted in Nano Lett

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Cited by in corpus (8)

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• Landau quantization in tilted Weyl semimetals with broken symmetry
• A High-Flux and High-Efficiency Setup for Magneto-Infrared Spectroscopy
• Magneto-optical evidence of tilting effect in coupled Weyl bands
• Particle-hole asymmetry and quantum confinement effects on the magneto-optical response of topological insulator thin-films
• Photo-induced Multiply Quantized Vortex States in Dirac-like Materials
• Observation of the superconducting proximity effect from surface states in SmB${}_6$/YB${}_6$ thin film heterostructures via terahertz spectroscopy
• In-Situ Polarimetry in Collimated Magneto-Infrared Spectroscopy System