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TT: Tiefe Temperaturen
TT 4: Correlated Electrons: Quantum Impurities, Kondo Physics
TT 4.4: Talk
Monday, March 27, 2006, 12:00–12:15, HSZ 301
Signatures of orbital two channel Kondo in the conductance of metallic nanowires? — •Procolo Lucignano1, Giuseppe E. Santoro1,2, Michele Fabrizio1,2, and Erio Tosatti1,2 — 1SISSA and INFM Democritos National Simulation Center, Via Beirut 2-4, 34014 Trieste, Italy — 2International Centre for Theoretical Physics (ICTP), P.O. Box 586, I-34014 Trieste, Italy
We describe the transport properties of metallic nanowires by using a realistic generalization of the two level system kondo model[1]. The problem is attached by using numerical renormalization group method[2] and its results analyzed in the framework of conformal field theory[3]. Fractional values of the conductance have been observed in recent experiments. We show that for particular choices of the parameters, such fractional conductances can appear as a signature of a two channel kondo phase, for a reasonable window of temperatures[4].
[1] K. Vladar, A. Zawadowski, Phys. Rev. B 28 1564 (1983).
[2] K. Wilson Rev. Mod. Phys. 47, 773 (1975).
[3] I. Affleck, A. W. W. Ludwig, Nucl. Phys. B 352, 849 (1991).
[4] P. Lucignano, G.E. Santoro, M. Fabrizio, E. Tosatti in preparation.