Tuning the Dirac point to the Fermi level in the ternary topological insulator (Bi${}_{1-x}$Sb${}_x$)${}_2$Te${}_3$

Abstract

In order to stabilize Majorana excitations within vortices of proximity induced topological superconductors, it is mandatory that the Dirac point matches the Fermi level rather exactly, such that the conventionally confined states within the vortex are well separated from the Majorana-type excitation. Here, we show by angle resolved photoelectron spectroscopy that (Bi${}_{1-x}$Sb${}_x$)${}_2$Te${}_3$ thin films with $x=0.94$ prepared by molecular beam epitaxy and transferred in ultrahigh vacuum from the molecular beam epitaxy system to the photoemission setup matches this condition. The Dirac point is within 10 meV around the Fermi level and we do not observe any bulk bands intersecting the Fermi level.

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Cited by in corpus (17)

• Growth, characterization, and transport properties of ternary (Bi1-xSbx)2Te3 topological insulator layers
• Infrared/Terahertz Spectra of the Photogalvanic Effect in (Bi,Sb)Te based Three Dimensional Topological Insulators
• Magnetotransport signatures of three-dimensional topological insulator nanostructures
• Defect Role in the Carrier Tunable Topological Insulator (Bi${}_{1-x}$Sb${}_x$)${}_2$Te${}_3$ Thin Films
• Shubnikov-de Haas oscillations in p and n-type topological insulator (Bi${}_x$Sb${}_{1-x}$)${}_2$Te${}_3$
• The AiiDA-KKR plugin and its application to high-throughput impurity embedding into a topological insulator
• Massive suppression of proximity pairing in topological (Bi${}_{1-x}$Sb${}_x{)}_2$Te${}_3$ films on niobium
• Robust and fragile Majorana bound states in proximitized topological insulator nanoribbons
• Spatially varying electronic dephasing in three dimensional topological insulators
• Lifetime and surface-to-bulk scattering off vacancies of the topological surface state in the three-dimensional strong topological insulators Bi2Te3 and Bi2Se3
• Switchable quantized conductance in topological insulators revealed by the Shockley-Ramo theorem
• Conductance of gated junctions as a probe of topological interface states
• Parasitic conduction channels in topological insulator thin films
• Low-energy modeling of three-dimensional topological insulator nanostructures
• Strong and Weak Three-Dimensional Topological Insulators Probed by Surface Science Methods
• Integration of topological insulator Josephson junctions in superconducting qubit circuits
• Lifting the spin-momentum locking in ultra-thin topological insulator films