Symmetry Breaking and Long Range Order in Heisenberg Antiferromagnets
Néel order in quantum Heisenberg antiferromagnetic spin systems has been a sub ject of considerable interest. This is not only because the problem has close connections with experiments, but also it offers a prototype of nontrivial many body problems in quantum systems where the order operator and the Hamiltonian do not commute with each other. In such a system, one encounters strong “quantum fluctuation”, which may lead to exotic behavior not observed in “classical” systems.
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- 7.T. Koma and H. Tasaki, “Obscured Symmetry Breaking and Low Lying States in Quantum Many-Body Systems”, preprint.Google Scholar