物理
重整化群
自旋(空气动力学)
重整化
格子(音乐)
虚假关系
量子力学
经典XY模型
海森堡模型
量子
凝聚态物理
数学物理
相变
数学
铁磁性
声学
热力学
统计
出处
期刊:Physical review
日期:1995-08-01
被引量:3
标识
DOI:10.1103/physrevb.52.4313
摘要
A quantum version of the Niemeijer--van Leeuwen real-space renormalization-group method is used to study the temperature dependence of the two- and four-spin correlations in the quantum XY model on the triangular lattice. The first-order cumulant expansion results suggest, similarly to other methods, a low-temperature phase of an essentially different kind from that predicted for the classical model. The possible explanation of the origin of the spurious 2D Heisenberg-like nontrivial fixed point in some renormalization-group calculations is also proposed.
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