Boson Mean Field Theory of the Square Lattice Heisenberg Model
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概要
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Two-dimensional Antiferromagnetic Heisenberg model is investigated by a meanfield theory, where order parameter corresponding to the resonating valence bond(RVB) state is retained. The spin is expressed by Schwinger bosons. As has beenshown before, this method gives long-range Neel order at 7'=0 [D. Yoshioka: J.Phys. Soc. Jpn. 58 (1989) 32], and gives reasonable results at finite temperatures [A.Auerbach and D. P. Arovas: Phys. Rev. Lett. 61 (1988) 617]. In the present paperphase diagram in a magnetic field is given. Exact expressionse for the specific heat,uniform susceptibility, and correlation length at low temperatures are given, too,which improve the results by Auerbach and Arovas. The results are compared withthose by computer simulations, and good agreement is obtained.[Heisenberg model, Schwinger boson, two-dimension, RVB, specific heat, suscep- ll tibility, correlation lengthl
- 社団法人日本物理学会の論文
- 1989-10-15
著者
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Yoshioka Daijiro
Department Of Basic Science Graduate School Of Arts And Sciences University Of Tokyo
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Yoshioka Daijiro
Department of Physics,Kyushu University
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