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HL: Fachverband Halbleiterphysik

HL 43: Symposium SYTI: Topological Insulators: Status Quo and Future Directions (Joint session of DS, HL, MA, O and TT, organized by TT)

HL 43.2: Invited Talk

Wednesday, March 9, 2016, 10:00–10:30, H1

Three-dimensional topological insulators and superconductors — •Yoichi Ando — II. Physikalisches Institut, Universität zu Köln

A topological quantum state of matter is characterized by a nontrivial topological structure of its Hilbert space. 3D topological insulators are characterized by non-trivial Z₂ topology, which is due to band inversion caused by strong spin-orbit coupling [1]. Intriguingly, when superconductivity shows up upon doping charge carriers into 3D topological insulators, the resulting superconducting state can also be topological [2], because the strong spin-orbit coupling could lead to an unconventional gap function characterized by a new Z₂ topological invariant [3]. In this talk, I will present experimental realizations of these materials and report recent efforts to address their exotic properties.
Y. Ando, J. Phys. Soc. Jpn. 81, 102001 (2013)
Y. Ando and L. Fu, Ann. Rev. Cond. Mat Phys. 6, 361 (2015)
S. Sasaki, M. Kriener, K. Segawa, K. Yada, Y. Tanaka, M. Sato,

and Y. Ando, PRL 107, 217001 (2011)