Dresden 2009 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
TT: Fachverband Tiefe Temperaturen
TT 2: Transport: Nanoelectronics I - Quantum Dots and Wires, Point Contacts 1
TT 2.1: Vortrag
Montag, 23. März 2009, 10:15–10:30, HSZ 301
Friedel oscillations in quantum wires: interplay of interactions and non-equilibrium — Daniel F Urban1 and •Andreas Komnik2 — 1Physikalisches Institut, Unversität Freiburg, Hermann-Herder-Str. 3, 79104 Freiburg i. Br. — 2Institut für Theoretische Physik, Universität Heidelberg, Philosophenweg 19, 69120 Heidelberg
We discuss the electron density oscillations in an interacting one-dimensional electron system with an impurity [1]. Under appropriate conditions the wave vector is given by different values kF=kL/R on left/right side of the scatterer, leading to a Landauer dipole formation. While in the non-interacting system the Friedel oscillations possess only one periodicity related to the local kL on the left side, the interplay of the interactions and non-equilibrium effects generates an additional peak in the spectrum of density oscillations at kR. The position and shape of this spectral feature, which in coordinate space is observable as a beating pattern in the Friedel oscillations, reveals many important details about the nature of interactions. We believe that it has a potential to become an investigation tool in condensed matter physics.
[1] D.F.Urban and A.Komnik, Phys. Rev. Lett. 100, 146602 (2008)