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arXiv 0907.1564cond-mat.stat-mech
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三维经典二聚体模型中非常规相变的经典到量子映射

Classical to quantum mapping for an unconventional phase transition in a three-dimensional classical dimer model

Stephen Powell, J. T. Chalker

摘要:

我们研究了库仑相和二聚体晶体之间的过渡,在三维经典二聚体模型的数值模拟中观察到的,通过将其映射到一个量子模型的玻色子在两个维度。从超流体到分数填充的莫特绝缘体的量子相变属于朗道-金兹伯格-威尔逊范式无法描述的一类。利用第二个映射,到一个对偶涡旋模型,我们证明了跃迁附近的长波长物理是由具有SU(2)物质场的U(1)规范理论描述的。

英文摘要:

We study the transition between a Coulomb phase and a dimer crystal observed in numerical simulations of the three-dimensional classical dimer model, by mapping it to a quantum model of bosons in two dimensions. The quantum phase transition that results, from a superfluid to a Mott insulator at fractional filling, belongs to a class that cannot be described within the Landau-Ginzburg-Wilson paradigm. Using a second mapping, to a dual model of vortices, we show that the long-wavelength physics near the transition is described by a U(1) gauge theory with SU(2) matter fields.

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