Volume 118, Number 4, May 2017
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||21 July 2017|
Electronic investigation on topological surface states of Bi0.9Sb0.1
1 Department of Physics, Pohang University of Science and Technology - Pohang 37673, Korea
2 Division of Advanced Materials Science, Pohang University of Science and Technology - Pohang 37673, Korea
3 Max Planck POSTECH Center for Complex Phase Materials, Pohang University of Science and Technology Pohang 37673, Korea
4 Pohang Accelerator Laboratory, Pohang University of Science and Technology - Pohang 37673, Korea
Received: 6 April 2017
Accepted: 20 June 2017
Topological surface states of Bi0.9Sb0.1 single crystal were reinvestigated by using the angle-resolved photoemission measurements. We identify the surface band topology near the point with two separate electron Fermi surfaces. It provides an indisputable picture of two topological surface bands between the and points, excluding the possible existence of a hypothetic trivial surface band proposed previously. We also examine the detailed nature of topological surface bands and estimate the Fermi velocity . The surface band near the point displays a characteristic warping structure originating from the rhombohedral symmetry, and the turns out to be highly anisotropic in both the hexagon-shaped electron and teardrop-shaped hole Fermi surface. Our investigation clarifies the topological surface states on Bi0.9Sb0.1, which is essential for the topological spintronics applications.
PACS: 73.20.-r – Electron states at surfaces and interfaces / 79.60.-i – Photoemission and photoelectron spectra / 71.20.-b – Electron density of states and band structure of crystalline solids
© EPLA, 2017
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