Frustrated Heisenberg antiferromagnets: Fluctuation-induced first order vs. deconfined quantum criticality
Frustrated Heisenberg antiferromagnets: Fluctuation-induced first order vs. deconfined quantum criticality
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受挫的海森堡反铁磁体：涨落引起的一阶与解禁量子临界性
DOI：
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
S. Scheidl
中科院分区：
文献类型：
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作者：
F. Kruger;S. Scheidl
最近有人认为，量子相变可以从根本上不同于经典相变，作为一个亮点，“去限制临界点”表现出量子数的分数化，由于Berry相位效应。这种转变应该发生在受抑（“J1-J2”）量子磁体中。我们已经开发了一种新的重整化方法，这样的系统是完全尊重的基本晶格结构。根据我们的发现，另一个深刻的现象即将出现：涨落引起的（无序中的有序）一级跃迁。这必须发生大自旋，我们推测，它是负责最近在数值模拟中观察到的弱一阶行为的挫折S = 1/2系统。
Recently it was argued that quantum phase transitions can be radically different from classical phase transitions with, as a highlight, the “deconfined critical points” exhibiting fractionalization of quantum numbers due to Berry phase effects. Such transitions are supposed to occur in frustrated (“J1-J2”) quantum magnets. We have developed a novel renormalization approach for such systems which is fully respecting the underlying lattice structure. According to our findings, another profound phenomenon is around the corner: a fluctuation-induced (order-out-of-disorder) first-order transition. This has to occur for large spin and we conjecture that it is responsible for the weakly first-order behavior recently observed in numerical simulations for frustrated S = 1/2 systems.