Berlin 2012 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 45: Correlated Electrons: Poster Session

TT 45.81: Poster

Donnerstag, 29. März 2012, 15:00–19:00, Poster B

Transport of an electron through a spin structure inside a quantum wire — •Christoph Hübner and Daniela Pfannkuche — I. Institut für Theoretische Physik, Hamburg, Germany

Transport properties of a quantum wire with embedded impurities is investigated in the framework of a numerically exact scattering formalism. The itinerant electrons are considered to interact with the impurities via a finite range exchange interaction. This leads to scattering of an initial wave package into different modes and spin states. We can map the integral Lippmann-Schwinger equation onto a system of linear equations. The solution of this equations is called the T-matrix. This matrix is directly related to the time dependent spacial and spin probability distribution of the itinerant electrons. The conductance of the quantum wire is associated with the transmission coefficients via the Landauer-Buettiker formula. It can be shown that the coefficients linearly depend on the elements of the T-matrix. Focus of our investigation lies on the cooperative dynamics of the impurities mediated by the conduction electrons. Screening effects of impurity momenta by localization of electrons are also of interest.