Work function of bulk-insulating topological insulator Bi2-xSbxTe3-ySey

Abstract

Recent discovery of bulk insulating topological insulator (TI) Bi2-xSbxTe3-ySey paved a pathway toward practical device application of TIs. For realizing TI-based devices, it is necessary to contact TIs with a metal. Since the band-bending at the interface dominates the character of devices, knowledge of TIs' work function is of essential importance. We have determined the compositional dependence of work function in Bi2-xSbxTe3-ySey by high-resolution photoemission spectroscopy. The obtained work-function values (4.95-5.20 eV) show a systematic variation with the composition, well tracking the energy shift of the surface chemical potential seen by angle-resolved photoemission spectroscopy. The present result serves as a useful guide for developing TI-based electronic devices.

arXiv comment4pages, 2 figures

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• Signatures of Topological Superconductivity in Bulk Insulating Topological Insulator BiSbTe${}_{1.25}$Se${}_{1.75}$ in Proximity with Superconducting NbSe${}_2$
• Electronic structure of Bi2Te3/FeTe heterostructure: implications for unconventional superconductivity
• Dirac-Fermion-Assisted Interfacial Superconductivity in Epitaxial Topological Insulator/Iron Chalcogenide Heterostructures
• Spatially varying electronic dephasing in three dimensional topological insulators
• Fractional AC Josephson effect in a topological insulator proximitized by a self-formed superconductor
• Electrical detection of spin-polarized current in topological insulator Bi1.5Sb0.5Te1.7Se1.3
• Magnetoresistance and gating effects in ultrathin NbN-$\mathrm{B}{\mathrm{i}}_2\mathrm{S}{\mathrm{e}}_3$ bilayers
• Observability of superconductivity in Sr-doped Bi2Se3 at the surface using scanning tunneling microscope
• Designer topological insulator with enhanced gap and suppressed bulk conduction in Bi2Se3/Sb2Te3 ultra-short period superlattices
• Surface-state mediated spin-to-charge conversion in Sb films via bilateral spin current injection
• Modulation of Dirac electrons in epitaxial Bi2Se3 ultrathin films on van-der-Waals ferromagnet Cr2Si2Te6
• Control of nonreciprocal charge transport in topological insulator/superconductor heterostructures with Fermi level tuning and superconducting-layer thickness
• Band structure of Bi surfaces formed on Bi2Se3 upon exposure to air