The magnetization curve of the two-dimensional spin-1/2 J1-J2 Heisenberg model is investigated by using the Chern-Simons theory under mean-field approximations. We find that the magnetization curve increases monotonically for J2/J1<0.267949, where the system under zero external field is in the antiferromagnetic Néel phase. For larger ratios of J2/J1, various plateaus will appear in the magnetization curve. In particular, in the disordered phase, our results support the existence of the M/Msat = 1/2 plateau, and predict a plateau at M/Msat = 1/3. Verification of these interesting results would indicate a strong connection between the frustrated antiferromagnetic system and the quantum Hall system.
|頁（從 - 到）||1844161-1844166|
|期刊||Physical Review B - Condensed Matter and Materials Physics|
|出版狀態||已發佈 - 2002 11月 1|
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