Dresden 2014 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 59: Topological insulators: Theory (with MA/O/TT)

HL 59.5: Vortrag

Mittwoch, 2. April 2014, 10:30–10:45, POT 151

Natural three-dimensional topological insulators in Tl4PbTe3 and Tl4SnTe3 — •Chengwang Niu1,2, Ying Dai1, Baibiao Huang1, Gustav Bihlmayer2, Yuriy Mokrousov2, Daniel Wortmann2, and Stefan Blügel21School of Physics, Shandong University, Jinan, China — 2Peter Grünberg Institut (PGI-1) & Institute for Advanced Simulation (IAS-1), Forschungszentrum Jülich and JARA, 52425 Jülich, Germany

The recently discovered three-dimensional topological insulators have attracted much interest due to their exceptional properties of possessing insulating bulk but time-reversal symmetry protected metallic surfaces with Dirac-like band structure [1,2]. The search for new topological insulators is critical for both fundamental and practical interests. Based on first-principles calculations, we reveal that both Tl4PbTe3 and Tl4SnTe3 are strong topological insulators with different band inversion behaviors at Γ point [3]. The mechanisms of band inversion in Tl4PbTe3 and Tl4SnTe3, as well as in Bi2Se3 and Sb2Se3, are investigated and classified. The Z2 topological invariants and topological surface states are investigated to confirm the topologically non-trivial phase. Our calculations further indicate that the electron- or hole-type Dirac fermion can be effectively engineered by hole doping, which is necessary for device applications of topological insulators.

[1] M. Hasan and C. Kane, Rev. Mod. Phys. 82, 3045 (2010).

[2] X.-L. Qi and S.-C. Zhang, Rev. Mod. Phys. 83, 1057 (2011).

[3] C. Niu et al., in preparation.

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