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O: Fachverband Oberflächenphysik

O 55: Electronic Structure and Spin-Orbit Interaction II

O 55.5: Talk

Wednesday, March 13, 2013, 17:00–17:15, H42

Strong correlations at topological insulator surfaces and the breakdown of the bulk-boundary correspondence — •Manuel Schmidt — RWTH Aachen, Deutschland

The criteria for strong correlations on surfaces of three-dimensional topological insulators are discussed. Usually, the Coulomb repulsion at such surfaces is too weak for driving a phase transition to a strongly correlated regime. I discuss a mechanism and possibilities of its experimental implementation by which the strength of the Coulomb interaction can be tuned over a wide range. In the strongly interacting regime, the surface states are gapped, even though the topological classification of the bulk band structure predicts gapless surface states.