Dresden 2014 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 55: Transport: Topological insulators I (organized by TT)

HL 55.8: Vortrag

Dienstag, 1. April 2014, 15:45–16:00, HSZ 304

PN junctions of Topological Insulators — •Sourin Das1 and Disha Wadhawan21MPIPKS, Dresden, Germany & University of Delhi, India — 2University of Delhi, India

Spin textures of surface states of topological insulators (TI) open up possibilities for designing ultra fast electrically controllable spin transistor. In this context I will discuss spin-valve effect associated with a gating induced PN junction designed on the surface state of 2D and 3D TI. I will show that *conduction to conduction* and *conduction to valence* band transport in a PN junction is topologically distinct resulting in asymmetric electrical transport. The topological distinction is shown to be quantifiable in term of the Pancharatnam geometric phase.

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