Regensburg 2002 – scientific programme
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TT: Tiefe Temperaturen
TT 13: Systeme korrelierter Elektronen: Theorie I
TT 13.2: Talk
Tuesday, March 12, 2002, 15:00–15:15, H20
Delocalization in Coupled Luttinger Liquids with Impurities — •Stefan Scheidl, Simon Bogner, and Thorsten Emig — Institut für Theoretische Physik, Universität zu Köln
We study effects of quenched disorder on coupled two-dimensional arrays of Luttinger liquids (LL) as a model for stripes in high-Tc compounds. In the framework of a renormalization-group analysis, we find that weak inter-LL charge-density-wave and Josephson couplings are always irrelevant as opposed to the pure system. By varying either disorder strength, intra- or inter-LL interactions, the system can undergo a delocalization transition between an insulator and a novel strongly anisotropic metallic state with LL-like transport. This state is characterized by short-ranged charge and superconducting order, which we also expect for a single delocalized LL.