Vector chiral phases in the frustrated 2D XY model and quantum spin chains.
Vector chiral phases in the frustrated 2D XY model and quantum spin chains.
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受挫 2D XY 模型和量子自旋链中的矢量手性相
DOI：
10.1103/physrevlett.112.157201
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发表时间：
2014
影响因子：
8.6
通讯作者：
T. Nattermann
中科院分区：
文献类型：
--
作者：
H. Schenck;V.L. Pokrovsky;T. Nattermann
对二维经典和一维受挫量子模型的相图进行了解析计算。发现了四种跃迁：由强波动触发的旋涡解结跃迁发生在手性跃迁温度以上和以下。涡旋相互作用在小尺度上是短距离的，在大尺度上是对数的。手性跃迁虽然在对称性上属于伊辛普适类，但由于非局域相互作用，其临界指数不同。在靠近Lifshitz点的狭窄区域，出现顺磁和准磁相之间的重入相变。讨论了反铁磁量子自旋链和多铁质的应用。
The phase diagram of the frustrated 2D classical and 1D quantummodels is calculated analytically. Four transitions are found: the vortex unbinding transitions triggered by strong fluctuations occur above and below the chiral transition temperature. Vortex interaction is short range on small and logarithmic on large scales. The chiral transition, though belonging to the Ising universality class by symmetry, has different critical exponents due to nonlocal interaction. In a narrow region close to the Lifshitz point a reentrant phase transition between paramagnetic and quasiferromagnetic phase appears. Applications to antiferromagnetic quantum spin chains and multiferroics are discussed.