Quantum phase transitions and conserved charges
Quantum phase transitions and conserved charges
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量子相变和守恒电荷
DOI：
10.1007/bf01317409
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发表时间：
1993
期刊：
影响因子：
--
通讯作者：
S. Sachdev
中科院分区：
文献类型：
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作者：
S. Sachdev
研究了零温二级量子相变附近守恒电荷密度标度性质的约束条件。我们介绍了广义威尔逊比，表征的非线性响应的外部场，H，耦合到任何保守的电荷，并认为它是一个完全通用的功能ofH/T：这是说明了模型系统的计算。我们还注意到过渡的顺序参数是一个保守的电荷（如在T =0铁磁顺磁过渡）的影响。
The constraints on the scaling properties of conserved charge densities in the vicinity of a zero temperature (T), second-order quantum phase transition are studied. We introduce a generalized Wilson ratio, characterizing the nonlinear response to an external field,H, coupling to any conserved charge, and argue that it is a completely universal function ofH/T: this is illustrated by computations on model systems. We also note implications for transitions where the order parameter is a conserved charge (as in aT=0 ferromagnet-paramagnet transition).