Crossed spin-1/2 heisenberg chains as a quantum impurity problem |
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| Authors: | Reyes S A Tsvelik A M |
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| Affiliation: | Department of Physics, Brookhaven National Laboratory, Upton, New York 11973-5000, USA. |
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| 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. |
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