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O: Fachverband Oberflächenphysik
O 88: Electronic structure II
O 88.2: Vortrag
Freitag, 30. März 2012, 10:45–11:00, MA 043
Spin- and angle-resolved photoemission spectroscopy on Bi2Te3 thin films — •Alexej Herdt1, Lukasz Plucinski1, Gustav Bihlmayer1, Georg Mussler1,2, Sven Döring3, Detlev Grützmacher1,2, Stefan Blügel1, and Claus Michael Schneider1,2,3 — 1Peter Grünberg Institut, Forschungszentrum Jülich — 2Jülich Aachen Research Alliance - Fundamentals of Future Information Technologies (JARA-FIT), Forschungszentrum Jülich — 3AG Prof. Dr. C.M. Schneider, University Duisburg-Essen
Recently, topological insulators have attracted wide attention in the field of condensed matter physics. Typical materials showing the topological phase are Bi1−xSbx, Bi2Se3 or Bi2Te3, which have been theoretically predicted and experimentally observed in several studies [1]. We investigate the surface state spin texture of an epitaxial MBE-grown Bi2Te3/Si(111) thin film using angle- and spin-resolved photoelectron spectroscopy (SP-ARPES). Film growth and characterization are described elsewhere [2,3]. Our study shows, that the linear Dirac cone is accompanied by deeper lying high spin-polarized energy dispersive surface states up to 4 eV binding energy. These states indicate clear reversals of the spin vector components for both chiralities measured on different Fermi surface positions located in the k-space. The results are supported by our high-resolved ARPES data as well as theoretical ab initio band structure calculations in thin film geometry.
[1] M. Z. Hasan et al., Rev. Mod. Phys. 82, 3045 (2010)
[2] J. Krumrain et al., J. Cryst. Growth 324, 115 (2011)
[3] L. Plucinski et al., Appl. Phys. Lett. 98, 222503 (2011)