Dresden 2014 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 105: Poster: Topological insulators (with MA/O)

HL 105.3: Poster

Donnerstag, 3. April 2014, 17:00–20:00, P1

Dielectric Function of the Topological Surface States of Bi2Se3 — •Markus Heinemann, Christian Franz, and Christian Heiliger — I. Physikalisches Institut, Justus Liebig University, 35392 Giessen, Germany

We investigate the material system Bi2Se3 which recently has been discovered to belong to the new class of topological insulators (TI). In this TI, robust surface states located in the insulating band gap of the bulk are protected by time-reversal symmetry and consist of a single Dirac cone at the Γ-point [1]. We use density functional theory to investigate the electronic structure and dielectric function of Bi2Se3 by first principles. In our calculations we study the bulk material and the Se terminated surface of Bi2Se3 which we simulate by a slab model and examine the effect of the slab thickness, i.e. the number of atomic layers. The essential effect of spin-orbit-coupling for the topological state and thus on the electronic and dielectric properties is presented by comparing calculations with and without this feature.

[1] H. Zhang, C.-X. Liu, X.-L. Qi, X. Dai, Z. Fang, and S.-C. Zhang, Nature Phys. 5, 438 (2009)

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