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TT: Tiefe Temperaturen

TT 5: Transport: Nanoelectronics I - Quantum Dots, Wires, Point Contacts - Part 1

TT 5.10: Vortrag

Montag, 27. März 2006, 12:15–12:30, HSZ 304

Transport of interacting electrons through quantum point contacts — •Andreas Lassl, Peter Schlagheck, and Klaus Richter — Institut für Theoretische Physik, Universität Regensburg

We investigate the influence of interaction effects on the electronic transport properties of two-dimensional nanostructures. For our numerical studies we use a self-consistent iteration scheme based on the nonequilibrium Green function formalism. This allows us to include electron-electron interactions on the level of a mean-field description for the spin-dependent conductance. For transport through point contacts we show how short-range interactions can cause an asymmetry in the transmission of different spin directions leading to anomalous conductance steps which resemble the so-called "0.7 anomaly" [1].

[1] K.J. Thomas, J.T. Nicholls, M.Y. Simmons, M. Pepper, D.R. Mace, D.A. Ritchie, Phys. Rev. Lett. 77, 135 (1996)