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Using equivalencies between different models we reduce the model of twospin-1/2 Heisenberg chains crossed at one point to the model of free fermions.The spin-spin correlation function is calculated by summing the perturbationseries in the interchain coupling. The result reveals a power law decay with anonuniversal exponent.Comment: 3 pages, the background information is adde

physical review letters

Crossed Spin-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mn>1</mml:mn><mml:mo>/</mml:mo><mml:mn>2</mml:mn></mml:math>Heisenberg Chains as a Quantum Impurity Problem

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