Scaling behaviour of the energy gap of spin-1/2 AF-Heisenberg chains in both uniform and staggered fields |
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Authors: | S Mahdavifar |
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Institution: | (1) Institute for Advanced Studies in Basic Sciences, Zanjan, 45195-1159, Iran |
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Abstract: | The energy gap of the 1D AF-Heisenberg model in the presence of both uniform (H) and staggered (h) magnetic fields is investigated
using the exact
diagonalization technique. The opening of the gap in the presence of a
staggered field is found to scale with hν, where ν=ν(H) is the
critical exponent, and depends on the uniform field. With respect to the range
of the staggered magnetic field, two regimes are identified through which the
dependence of the real critical exponent ν(H) on H can be calculated
numerically. Our numerical results are in good agreement with the results
obtained by other theoretical approaches. |
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Keywords: | 75 10 Jm Quantized spin models 75 10 Pq Spin chain models |
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