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Renormalization-Group Investigation Of Thes = 1random Antiferromagnetic Heisenberg Chain

Author

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  • PÉTER LAJKÓ

    (Department of Physics, Kuwait University, Kuwait City, Safat 13060, P. O. Box 5969, Kuwait)

Abstract

We introduce variants of the Ma-Dasgupta renormalization-group (RG) approach for random quantum spin chains, in which the energy-scale is reduced by decimation built on either perturbative or non-perturbative principles. In one non-perturbative version of the method, we require the exact invariance of the lowest gaps, while in a second class of perturbative Ma-Dasgupta techniques, different decimation rules are utilized. For theS = 1random antiferromagnetic Heisenberg chain, both type of methods provide the same type of disorder dependent phase diagram, which is in agreement with density-matrix renormalization-group calculations and previous studies.

Suggested Citation

  • Péter Lajkó, 2006. "Renormalization-Group Investigation Of Thes = 1random Antiferromagnetic Heisenberg Chain," International Journal of Modern Physics C (IJMPC), World Scientific Publishing Co. Pte. Ltd., vol. 17(12), pages 1739-1753.
    • Handle: RePEc:wsi:ijmpcx:v:17:y:2006:i:12:n:s0129183106010169
    DOI: 10.1142/S0129183106010169
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