Rigorous results on a first-order phase transition in antiferromagnetic spin-1/2 coupled chains.
Rigorous results on a first-order phase transition in antiferromagnetic spin-1/2 coupled chains.
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DOI：
10.1103/physrevb.52.12485
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发表时间：
1995-01
期刊：
影响因子：
--
通讯作者：
Xian
中科院分区：
文献类型：
--
作者：
Xian
对于具有最近邻和次近邻海森堡相互作用的自旋 1/2 耦合链中二聚态和 Haldane 型态（即类似于一维自旋 1 海森堡链的基态的状态）之间的一阶量子相变，给出了一些严格的结果。还提出了两个阶段中的一类精确激发态。讨论了一般自旋 1/2 耦合链的部分相图。
Some rigorous results are presented for a first-order quantum phase transition between the dimerized state and Haldane-type state (i.e., a state similar to the ground state of the one-dimensional spin-1 Heisenberg chain) in the spin-1/2 coupled chains with nearest-neighbor and next-nearest-neighbor Heisenberg interactions. Also presented is a class of exact excited states in both phases. A partial phase diagram of the general spin-1/2 coupled chains is discussed.