Archiviertes Physik-Kolloquium:

30. May. 2013, 16:15 Uhr, Gebäude NW1, Raum H3

Quantum states protected by topology: Quantum Hall effects, topological quantum computing and Majorana fermions

Prof. Dr. Werner Wegscheider, ETH Zürich

The theoretical proposal of a novel class of particles that are their own anti-particles – Majorana fermions – has stimulated research ranging from neutrino physics to dark matter searches. However, recent advances in the synthesis of low-dimensional semiconductor structures allow for the realization of this elusive class of objects also in the condensed matter domain. This talk will survey the search for non-Abelian anyons in the fractional quantum Hall effect as well as for tunable two-dimensional topological insulators based on inverted electron-hole bilayer systems. These remarkable developments could overcome one of the main obstacles in quantum computing, the decoherence of quantum states, by topological protection.