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Connection of a Topological Surface State with the Bulk Continuum in Sb2Te3(0001)

Citace:
SIEBEL, C., BENTMANN, H., BRAUN, J., MINÁR, J., MAASS, H., SAKAMOTO, K., ARITA, M., SHIMADA, K., EBERT, H., REINERT, F. Connection of a Topological Surface State with the Bulk Continuum in Sb2Te3(0001). Physical Review Letters, 2015, roč. 114, č. 6, s. \´066802-1\´- \´066802-5\´. ISSN: 0031-9007
Druh: ČLÁNEK
Jazyk publikace: eng
Anglický název: Connection of a Topological Surface State with the Bulk Continuum in Sb2Te3(0001)
Rok vydání: 2015
Autoři: C. Siebel , H. Bentmann , J. Braun , Doc.Dr. Jan Minár , H. Maass , K. Sakamoto , M. Arita , K. Shimada , H. Ebert , F. Reinert
Abstrakt EN: The surface state of a Z2 topological insulator connects with the conduction and valence band continua of the bulk, thereby bridging the band gap of the volume. We investigate this connection of the surface and bulk electronic structure for Sb2 Te3 ?0001? by photoemission experiments and calculations. Upon crossing the topmost valence band the topological surface state (TSS) maintains a coherent spectral signature, a twodimensional character, and a linear dispersion relation. Surface-bulk coupling manifests itself in the spectra through (i) a characteristic kink in the TSS dispersion as it crosses the topmost valence band and (ii) the appearance of hybridization gaps between the TSS and bulk-derived surface resonance states at higher binding energies. The findings provide a natural explanation for the unexpectedly weak surface-bulk mixing indicated by recent transport experiments on Sb2 Te3.
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