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TT: Fachverband Tiefe Temperaturen

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

TT 21.11: Talk

Tuesday, March 27, 2012, 12:15–12:30, BH 334

Cooperative Emission in Transport Setting through a Quantum Dot — •Martin J. A. Schuetz, Eric M. Kessler, Geza Giedke, and Juan Ignacio Cirac — Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Str. 1, D-85748 Garching, Germany

We theoretically show that intriguing features of coherent many-body physics can be observed in electron transport through a quantum dot (QD). In particular, we show that electron transport in the Pauli-blockade regime is coherently enhanced by hyperfine interaction (HF) with the nuclear spin ensemble in the QD. For an initially polarized nuclear system this leads to a strong current peak in close analogy with superradiant emission of photons from atomic ensembles. This effect could be observed with realistic experimental parameters and would provide clear evidence of coherent HF dynamics of nuclear spin ensembles in QDs.