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TT: Fachverband Tiefe Temperaturen
TT 9: Transport: Quantum Dots, Quantum Wires, Point Contacts I (organized by TT)
TT 9.5: Talk
Monday, March 31, 2014, 10:30–10:45, BEY 81
Energy current cotunnelling features for the Anderson quantum dot — •Niklas M. Gergs1, Christoph B. M. Hörig1, Dirk Schuricht1, and Maarten R. Wegewijs2,3,4 — 1Institute for Theoretical Physics, Utrecht University, Netherlands — 2Institute for Theory of Statistical Physics, RWTH Aachen University, Germany — 3JARA–Fundamentals of Future Information Technology — 4Peter Grünberg Institut, Forschungszentrum Jülich, Germany
We discuss the particle and energy current through an Anderson quantum dot with a strong Coulomb interaction U subject to both voltage and temperature bias. A diagrammatic perturbation theory up to second order in the tunnel rates Γ is set up in Liouville space. We find that pair tunnelling features show up in the particle and energy current, while pure inelastic cotunnelling spinflip features are absent in the energy current. The latter cotunnelling processes do appear however when assisted by sequential tunnelling (COSET). Therefore, the energy current contains more distinctive features than the particle current. Thus one can use the energy current for enhanced spectroscopy of quantum dot systems.