Dresden 2006 – wissenschaftliches Programm
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TT: Tiefe Temperaturen
TT 5: Transport: Nanoelectronics I - Quantum Dots, Wires, Point Contacts - Part 1
TT 5.11: Vortrag
Montag, 27. März 2006, 12:30–12:45, HSZ 304
Transport through Interacting Quantum Wires with Impurities: Influence of Tunneling Barriers on Power Laws. — •Severin Jakobs1, Tilman Enss2, Volker Meden3, and Herbert Schoeller1 — 1Institut für Theoretische Physik A, RWTH Aachen, D-52056 Aachen, Germany — 2Max-Planck-Institut für Festkörperforschung, D-70569 Stuttgart, Germany — 3Institut für Theoretische Physik, Universität Göttingen, D-37077 Göttingen, Germany
We theoretically analyze the conductance through an interacting quantum wire with impurities, and its dependence on temperature and voltage. The wire is modelled by a tight-binding-chain including nearest neighbour interaction. For calculating the transport properties, we use a functional renormalization group method recently developed for the analysis of linear transport through quantum wires [1], and a generalization of this technique to nonlinear transport. We find that the power laws predicted by bosonization for the current vs. temperature or the current vs. voltage [2] are eliminated if tunneling barriers separate the wire from the leads. This behaviour can be traced back to the scaling of the height and width of the single peaks of transmission.
[1] V.Meden et al., Phys.Rev.B 65, 045318 (2002)
[2] C.L.Kane, M.P.A.Fisher, Phys.Rev.B 46, 15233 (1992)