On the coexistence of different types of long-range order in the strongly frustrated two-dimensional Heisenberg model

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• 作者：A.V. Mikheyenkov^a ; ^b ; ^{mikheen@bk.ru} ; A.F. Barabanov^a ; A.V. Shvartsberg^b
• 关键词：A. Two-dimensional antiferromagnet ; A. Frustration ; A. Quantum phase transition ; D. Spin excitations spectrum
• 刊名：Solid State Communications
• 出版年：2012
• 期刊代码：101_00381098
• 类别：ms
• 出版时间：May, 2012
• 卷：152
• 期：10
• 页码：831-834
• 文件大小：496 K

摘要

In the spherically symmetric self-consistent approach to spin-spin Green鈥檚 functions, we consider a two-dimensional strongly frustrated quantum antiferromagnet. In the classical limit , the phase diagram of the model demonstrates two triple points. We show that, in the quantum limit for , a quadruple point of the quantum phase transition appears. At this point, the four coexisting phases are a disordered spin-liquid phase and three phases with different types of long-range order. Two of them are well-known 鈥渃heckerboard鈥?N茅el order and stripe order; the last one corresponds to a non-trivial state with two coexisting mutually penetrating long-range orders.