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TT: Fachverband Tiefe Temperaturen

TT 21: Transport: Nanoelectronics I - Quantum Dots, Wires, Point Contacts 3

TT 21.7: Vortrag

Dienstag, 27. März 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.