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29 March 2024
 
  » arxiv » cond-mat/9709199

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A mean field theory for the spin ladder system
Xi Dai ; Zhao-bin Su ;
Date 18 Sep 1997
Subject Strongly Correlated Electrons; Statistical Mechanics | cond-mat.str-el cond-mat.stat-mech
AbstractIn the present paper, we propose a mean field approach for spin ladders based upon the Jordan-Wigner transformation along an elaborately ordered path. We show on the mean field level that ladders with even number legs open a energy gap in their low energy excitation with a magnitude close to the corresponding experimental values, whereas the low energy excitation of the odd-number-leg ladders are gapless. It supports the validity of our approach. We then calculate the gap size and the excitation spectra of 2-leg-ladder system. Our result is in good agreement with both the experimental data and the numerical results.
Source arXiv, cond-mat/9709199
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