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TT: Tiefe Temperaturen

TT 30: Postersitzung IV: Kritische Ph
änomene, Quantenstörstellen, niederdimensionale Systeme

TT 30.22: Poster

Thursday, March 11, 2004, 14:30–19:00, Poster A

Quantum Monte Carlo simulation for the conductance of one-dimensional quantum spin systems — •Kim Louis und Claudius Gros — Universität des Saarlandes

Recently, the stochastic series expansion (SSE) has been proposed as a powerful MC-method, which allows simulations at low T for quantum-spin systems. We show that the SSE allows to compute the magnetic conductance for various one-dimensional spin systems without further approximations. We consider various modifications of the anisotropic Heisenberg chain. We recover the Kane-Fisher scaling for one impurity in a Luttinger-liquid and study the influence of non-interacting leads for the conductance of an interacting system.