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Dresden 2014 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 74: Correlated Electrons: Quantum Impurities, Kondo Physics

TT 74.6: Talk

Wednesday, April 2, 2014, 16:15–16:30, BEY 81

Continuous-time Quantum Monte Carlo approach for quantum impurity problems in Tomonaga-Luttinger liquids — •Kazumasa Hattori1,2 and Achim Rosch11Institute for Theoretical Physics, University of Cologne, Germany — 2Institute for Solid State Physics, University of Tokyo, Japan

We have developed a continuous-time quantum monte carlo method [1] for single-impurity problems in Tomonaga-Luttinger (TL) liquid in one-dimension. The method is negative-sign free and applicable to varieties of models. In this contribution, we will show results for a potential barrier problem in one-channel TL liquid [2] as a benchmark and also discuss an anisotropic Kondo problem in a helical TL liquid on the edge of two-dimensional topological insulator. Various correlation functions are calculated and we discuss the crossover functions from high- to very low-temperature fixed points and their critical behaviors.
E. Gull, et al., Rev. Mod. Phys. 83, 349 (2011)
C. L. Kane and M. P. A. Fisher, Phys. Rev. Lett. 68, 1220 (1992)

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