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Phase Transition and Hidden Orders of the Heisenberg Ladder Model in the Ground State

1995; Physical Society of Japan; Volume: 64; Issue: 6 Linguagem: Inglês

10.1143/jpsj.64.1967

1347-4073

Yoshihiro Nishiyama, Naomichi Hatano, Masuo Suzuki,

Quantum and electron transport phenomena

A ground-state phase transition of the antiferromagnetic Heisenberg ladder model is investigated by means of the exact-diagonalization method. A hidden-order correlation is defined for characterizing the ground state. The critical point and the exponent ν are estimated accurately with the use of the hidden-order correlation. The relevance of the resonating-valence-bond theory to the present system is also discussed by inspecting hidden orders and the elementary excitation.