Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2012-01-20
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
5 pages, 4 figures
Scientific paper
Using high resolution spin- and angle-resolved photoemission spectroscopy, we map the electronic structure and spin texture of the surface states of the topological insulator Sb2Te3. In combination with density functional calculations, we directly show that Sb2Te3 exhibits Z2 topological properties with a partially occupied, single spin-Dirac cone around the Fermi energy. Furthermore, we observe a strongly spin-orbit split surface band at lower energy. This state starts at the gamma-point, 0.8eV below the fermi energy, disperses upwards, and disappears at about 0.4eV below the fermi energy into two different bulk bands. Along the gamma-K direction, the band is located within a spin-orbit gap. According to an argument given by Pendry and Gurman, such a surface state must be present within each spin-orbit gap located away from the high symmetry points of the Brillouin zone. Thus, similar to the topological Dirac cone, this novel state is protected by symmetry.
Bihlmayer Gustav
Blügel Stefan
Georgi A.
Grob Matthias
Liebmann Manfred
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