Shubnikov-de Haas oscillations from topological surface states of metallic Bi${}_2$Se${}_{2.1}$Te${}_{0.9}$

Abstract

We have studied the quantum oscillations in the conductivity of metallic, p-type Bi${}_2$Se${}_{2.1}$Te${}_{0.9}$. The dependence of the oscillations on the angle of the magnetic field with the surface as well as the Berry phase determined from the Landau level fan plot indicate that the observed oscillations arise from surface carriers with the characteristic Dirac dispersion. Several quantities characterizing the surface conduction are calculated employing the Lifshitz-Kosevich theory. The low value of the Fermi energy with respect to the Dirac point is consistent with the metallic character of the bulk hole carriers. We conclude that, due to the peculiar shape of the valence band, the Shubnikov-de Haas oscillations of the bulk carriers are shifted to higher magnetic fields which allows for the detection of the quantum oscillations from the topological surface states at lower field.

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• Extremely large non-saturating magnetoresistance and ultrahigh mobility due to topological surface states in metallic Bi2Te3 topological insulator
• Quantum oscillations in metallic Sb2Te2Se topological insulator
• Weak antilocalization effect due to topological surface states in Bi${}_2$Se${}_{2.1}$Te${}_{0.9}$
• Coexistence of bulk and surface states probed by Shubnikov-de Haas oscillations in Bi${}_2$Se${}_3$ with high charge-carrier density
• Shubnikov-de Haas oscillations in p and n-type topological insulator (Bi${}_x$Sb${}_{1-x}$)${}_2$Te${}_3$
• Simple mechanisms that impede the Berry phase identification from magneto-oscillations
• Simultaneous detection of quantum oscillations from bulk and topological surface states in metallic Bi2Se2.1Te0.9
• Bulk contribution to magnetotransport properties of low defect-density Bi${}_2$Te${}_3$ topological insulator thin films
• Large magnetoresistance and Fermi surface study of Sb${}_2$Se${}_2$Te single crystal
• Magneto-transport and Berry phase in magnetically doped Bi${}_{0.97-x}$Sb${}_{0.03}$ single crystals
• A Green's function approach to Topological Insulator junctions with magnetic and superconducting regions
• Topological delocalization and tuning of surface channel separation in Bi2Se2Te Topological Insulator Thin films
• Effect of pressure on the transport properties and thermoelectric performance of Dirac semimetal ZrTe5
• Tuning Chemical Potential in the Dirac Cone by Compositional Engineering