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Ground State Properties Of Two Spin Models With Exactly Known Ground States On The Square Lattice

Author

Listed:
  • A. SINDERMANN

    (Theoretische Physik, Universität zu Köln, Zülpicher Str.77, 50937 Köln, Germany)

  • U. LÖW

    (Theoretische Physik, Universität zu Köln, Zülpicher Str.77, 50937 Köln, Germany)

  • J. ZITTARTZ

    (Theoretische Physik, Universität zu Köln, Zülpicher Str.77, 50937 Köln, Germany)

Abstract

We introduce a new two-dimensional model with diagonal four spin exchange and an exactly known ground-state. Using variational ansätze and exact diagonalisation we calculate upper and lower bounds for the critical coupling of the model. Both for this model and for the Shastry–Sutherland model we study periodic systems up to system size6×6.

Suggested Citation

  • A. Sindermann & U. Löw & J. Zittartz, 2006. "Ground State Properties Of Two Spin Models With Exactly Known Ground States On The Square Lattice," International Journal of Modern Physics C (IJMPC), World Scientific Publishing Co. Pte. Ltd., vol. 17(08), pages 1085-1094.
    • Handle: RePEc:wsi:ijmpcx:v:17:y:2006:i:08:n:s0129183106009709
    DOI: 10.1142/S0129183106009709
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