Dresden 2014 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 4: Transport: Quantum Dots, Quantum Wires, Point Contacts I (TT jointly with O)

O 4.5: Vortrag

Montag, 31. März 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. Wegewijs^2,3,4 — 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.