Berlin 2008 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 35: Transport: Nanoelectronics I - Quantum Dots, Wires, Point Contacts 3
TT 35.13: Vortrag
Donnerstag, 28. Februar 2008, 17:30–17:45, H 3010
Conductivity of a disordered fermion-gaugefield system — •Thomas Ludwig1, Igor V. Gornyi2, Alexander D. Mirlin2,3, and Peter Woelfle3 — 1Instituut-Lorentz, Universiteit Leiden, The Netherlands — 2Institut fuer Nanotechnologie, Forschungszentrum Karlsruhe, Germany — 3Institut fuer Theorie der kondensierten Materie, Universitaet Karlsruhe, Germany
We present a discussion of the interaction correction to conductivity in a disordered system of fermions interacting via a Chern-Simons gauge field. To first order in the interaction, we find a large positive Hartree correction to the conductivity. To account for higher orders in the interaction, we discuss effects of dephasing (at high temperatures) and screening (at low temperatures) on the Hartree correction. At sufficiently high temperatures, the Hartree correction is strongly suppressed by dephasing. At very low temperatures, the correction changes its sign to negative due to screening.