Unoccupied topological surface state in Bi${}_2$Te${}_2$Se

Abstract

Bias voltage dependent scattering of the topological surface state is studied by scanning tunneling microscopy/spectroscopy for a clean surface of the topological insulator Bi${}_2$Te${}_2$Se. A strong warping of constant energy contours in the unoccupied part of the spectrum is found to lead to a spin-selective scattering. The topological surface state persists to higher energies in the unoccupied range far beyond the Dirac point, where it coexists with the bulk conduction band. This finding sheds light on the spin and charge dynamics over the wide energy range and opens a way to designing opto-spintronic devices.

5 pages, 4 figures

References in corpus (21)

• Topological Insulators
• Topological insulators and superconductors
• Topological Insulators in Three Dimensions
• Discovery (theoretical prediction and experimental observation) of a large-gap topological-insulator class with spin-polarized single-Dirac-cone on the surface
• Topological Surface States Protected From Backscattering by Chiral Spin Texture
• Hexagonal Warping Effects in the Surface States of Topological Insulator Bi${}_2$Te${}_3$
• Experimental demonstration of the topological surface states protected by the time-reversal symmetry
• Large bulk resistivity and surface quantum oscillations in the topological insulator Bi2Te2Se
• Three-Dimensional Topological Insulators
• STM imaging of electronic waves on the surface of Bi${}_2$Te${}_3$: topologically protected surface states and hexagonal warping effects
• Strong surface scattering in ultrahigh mobility Bi2Se3 topological insulator crystals
• Ultrafast Optical Excitation of a Persistent Surface-State Population in the Topological Insulator Bi2Se3
• Spatial Fluctuations of Helical Dirac Fermions on the Surface of Topological Insulators
• Optical characterization of topological insulator surface states: Berry curvature-dependent response
• Topological Surface States and Dirac point tuning in ternary Bi2Te2Se class of topological insulators
• Angular-dependent oscillations of the magnetoresistance in Bi_2Se_3 due to the three-dimensional bulk Fermi surface
• Surface Scattering via Bulk Continuum States in the 3D Topological Insulator Bi${}_2$Se${}_3$
• STM imaging of impurity resonances on Bi${}_2$Se${}_3$
• Ternary Tetradymite Compounds as Topological Insulators
• Topological Surface States with Persistent High Spin Polarization across Dirac Point in Bi${}_2$Te${}_2$Se and Bi${}_2$Se${}_2$Te
• Unoccupied Topological States on Bismuth Chalcogenides

Cited by in corpus (10)

• Spin-Polarized Surface Resonances Accompanying Topological Surface State Formation
• Direct Measurement of Surface Transport on a Bulk Topological Insulator
• Work function of bulk-insulating topological insulator Bi2-xSbxTe3-ySey
• Ionic and electronic properties of the topological insulator Bi${}_2$Te${}_2$Se investigated using $\beta$-detected nuclear magnetic relaxation and resonance of ${}^8$Li
• Ultrafast Evolution of Bulk, Surface and Surface Resonance States in Photoexcited Bi${}_2$Te${}_3$
• Time evolution of rotating and magnetized white dwarf stars
• Electronic and Vibrational Excitations on the Surface of the Three-Dimensional Topological Insulator Bi${}_2$Te${}_{3-x}$Se${}_x$ (x = 0, 2, 3)
• Observation of Dirac Charge Density Waves in Bi${}_2$Te${}_2$Se
• Topological surface states hybridized with bulk states of Bi-doped PbSb2Te4 revealed in quasiparticle interference
• Surface-dominated Conductivity of Few-layered Antimonene