Berlin 2012 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 21: Transport: Nanoelectronics I - Quantum Dots, Wires, Point Contacts 3
TT 21.7: Talk
Tuesday, March 27, 2012, 11:00–11:15, BH 334
Cotunneling conductance of nonabelian excitations in fractional quantum Hall edge systems — •Robert Zielke1, Bernd Braunecker2, and Daniel Loss1 — 1Department of Physics, University of Basel, Switzerland — 2Departamento de Física Teórica de la Materia Condensada, Facultad de Ciencias, Universidad Autónoma de Madrid, Spain
We consider theoretically a fractional quantum Hall (FQH) system at filling fraction 5/2, containing a dot or antidot in the bulk. We look for specific signatures of the Moore-Read state, which is the most prominent candidate state for the 5/2-FQH system and supports nonabelian excitations. Two different setups are considered: (a) cotunneling of electrons between two different FQH samples via a dot and (b) cotunneling of fractional charges between the edge states of one single FQH sample via an antidot. Both setups lead to characteristic tunneling currents with line shapes significantly different from the one of a Fermi liquid.