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TT: Fachverband Tiefe Temperaturen

TT 103: Transport: Poster Session

TT 103.46: Poster

Donnerstag, 19. März 2015, 15:00–18:00, Poster B

Transport in topological insulator thin films: weak localization and universal conductance fluctuations — •Hristo Velkov^1,2, Georg Schwiete¹, and Tobias Micklitz³ — ¹Institut für Physik, Johannes Gutenberg Universität Mainz, 55128 Mainz, Germany — ²Dahlem Center for Complex Quantum Systems and Fachbereich Physik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany — ³Centro Brasileiro de Pesquisas Físicas, Rua Xavier Sigaud 150, 22290-180 Rio de Janeiro, Brazil

Motivated by the experimental difficulty to produce topological insulators with pure surface-state conduction, we study the effect that the bulk can have on the transport properties of the system. In particular, we focus on the weak localization (WL) and universal conductance fluctuations (UCF) physics in a topological insulator of the Bi₂Se₃ family, modelled by an effective low-energy Hamiltonian. Utilizing diagrammatic perturbation theory techniques we analyse the bulk and the surface separately and subsequently discuss WL and UCF when a tunneling-based coupling is introduced.