Crossed Spin-1/2 Heisenberg Chains as a Quantum Impurity Problem

ORAL

Abstract

Using equivalencies between different models we reduce the model of two spin-1/2 Heisenberg chains crossed at one point to the model of free fermions. The spin-spin correlation function is calculated by summing the perturbation series in the interchain interaction. The result reveals a power law decay with a nonuniversal exponent.

*This research was supported by US DOE under contract No. DE-AC02-98 CH 10886.

–

Authors

  • Sebastian Reyes

    • Brookhaven National Laboratory and Stony Brook University

  • Alexei Tsvelik

    • Brookhaven National Laboratory