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26 April 2024 |
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Unoccupied Topological States on Bismuth Chalcogenides | | D. Niesner
; Th. Fauster
; S. V. Ereemev
; T. V. Menshchikova
; Y. M. Koroteev
; A. P. Protogenov
; E. V. Chulkov
; O. E. Tereshchenko
; K. A. Kokh
; O. Alekperov
; A. Nadjafov
; N. Mamedov
; | | Date: |
11 Oct 2012 | | Abstract: | The unoccupied part of the band structure of topological insulators
Bi$_2$Te$_{x}$Se$_{3-x}$ ($x=0,2,3$) is studied by angle-resolved two-photon
photoemission and density functional theory. For all surfaces
linearly-dispersing surface states are found at the center of the surface
Brillouin zone at energies around 1.3 eV above the Fermi level. Theoretical
analysis shows that this feature appears in a spin-orbit-interaction induced
and inverted local energy gap. This inversion is insensitive to variation of
electronic and structural parameters in Bi$_2$Se$_3$ and Bi$_2$Te$_2$Se. In
Bi$_2$Te$_3$ small structural variations can change the character of the local
energy gap depending on which an unoccupied Dirac state does or does not exist.
Circular dichroism measurements confirm the expected spin texture. From these
findings we assign the observed state to an unoccupied topological surface
state. | | Source: | arXiv, 1210.3281 | | Services: | Forum | Review | PDF | Favorites | |
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