Abstract
Two- and three-dimensional topological insulators are the key materials for the future nanoelectronic and spintronic devices and quantum computers. By means of angle- and spin-resolved photoemission spectroscopy we study the electronic and spin structure of the Bi-bilayer/3D topological insulator in quantum tunneling regime formed under the short annealing of Bi2Te2.4Se0.6. Owing to the temperature-induced restructuring of the topological insulator’s surface quintuple layers, the hole-like spin-split Bi-bilayer bands and the parabolic electronic-like state are observed instead of the Dirac cone. Scanning Tunneling Microscopy and X-ray Photoemission Spectroscopy measurements reveal the appearance of the Bi2 terraces at the surface under the annealing. The experimental results are supported by density functional theory calculations, predicting the spin-polarized Bi-bilayer bands interacting with the quintuple-layers-derived states. Such an easily formed heterostructure promises exciting applications in spin transport devices and low-energy electronics.
Highlights
Topological insulator (TI) phase, realized in materials with strong spin-orbit interaction, became one of the most intriguing topics in condensed matter physics
By means of Spin- and Angle-Resolved Photoemission Spectroscopy (SARPES) we study the alteration of the Dirac cone-like electronic structure near the Fermi level of the annealed BTS
In refs 27 and 28 it has been shown that the compound Bi2Te2.4Se0.6 (BTS) exhibits the pronounced Dirac cone-like topological surface states (TSS), with the Dirac point located at the binding energy of
Summary
Topological insulator (TI) phase, realized in materials with strong spin-orbit interaction, became one of the most intriguing topics in condensed matter physics. The contact of 2D and 3D TIs is of particular interest owing to the interplay of 2D and 1D spin transport channels Such topological heterostructures have been grown and studied in several systems[10,11,12,13,14] including graphene[15,16,17], which can be turned to topological phase via contact with heavy atoms[18]. By means of Spin- and Angle-Resolved Photoemission Spectroscopy (SARPES) we study the alteration of the Dirac cone-like electronic structure near the Fermi level of the annealed BTS. DFT calculations and spin resolved spectra show the spin polarization of these states, and the effects of hybridization between them
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