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Ordering Energy Levels of Interacting Spin Systems

  • Elliott Lieb
  • Daniel Matris
Chapter

Abstract

The total spin S is a good quantum number in problems of interacting spins. We have shown that for rather general antiferromagnetic or ferrimagnetic Hamiltonians, which need not exhibit translational invariance, the lowest energy eigenvalue for each value of S [denoted E(S)] is ordered in a natural way. In antiferromagnetism, E(S + 1) > E(S) for S > O. In ferrimagnetism, E(S + 1) > E(S) for S > S, and in addition the ground state belongs to S < S. S is defined as follows: Let the maximum spin of the A sublattice be S A and of the B sublattice S B; then SS AS B. Antiferromagnetism is treated as the special case of S = O. We also briefly discuss the structure of the lowest eigen-functions in an external magnetic field.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2004

Authors and Affiliations

  • Elliott Lieb
    • 1
  • Daniel Matris
    • 1
  1. 1.Thomas J. Watson Research CenterInternational Business Machines CorporationYorktown HeightsUSA

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