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TT: Fachverband Tiefe Temperaturen

TT 35: Transport: Nanoelectronics I - Quantum Dots, Wires, Point Contacts 3

TT 35.13: Talk

Thursday, February 28, 2008, 17:30–17:45, H 3010

Conductivity of a disordered fermion-gaugefield system — •Thomas Ludwig¹, Igor V. Gornyi², Alexander D. Mirlin^2,3, 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.