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arXiv 0902.1719cond-mat.mes-hall
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基于非幺正共形场论的量子霍尔态的修正库仑气体构造

Modified Coulomb gas construction of quantum Hall states from non-unitary conformal field theories

M. V. Milovanović, Th. Jolicœur, I. Vidanović

摘要:

在实验中观察到的一些分数量子霍尔态可以用具有特殊聚簇性质的第一量子化波函数来描述,如填充因子nu = 5/2的摩尔-里德Pfiran。这个波函数是通过构造包含自由玻色子和马约拉纳费米子的二维共形场论(CFT)的关联函数而构造的。通过考虑其他的CFTs,在适当的情况下,许多其他的聚集态被提议作为候选的CHTH态。据信,如果想要描述不可压缩的,即有间隙的液体状态,则基础的CFT应该是单一的。我们表明,通过改变的方式,从它的父CFT得到的波函数,它是可能的,以获得一个不可压缩的候选状态时,从一个非酉父。该结构模拟了电子系统相空间中参数的全局变化。我们明确了我们的建设的情况下,所谓的加夫尼状态(填充因子2/5的状态),也为Haldane-Rezayi状态(自旋单态填充1/2)。

英文摘要:

Some fractional quantum Hall states observed in experiments may be described by first-quantized wavefunctions with special clustering properties like the Moore-Read Pfaffian for filling factor nu = 5/2. This wavefunction has been constructed by constructing correlation functions of a two-dimensional conformal field theory (CFT) involving a free boson and a Majorana fermion. By considering other CFTs many other clustered states have been proposed as candidate FQH states under appropriate circumstances. It is believed that the underlying CFT should be unitary if one wants to describe an incompressible i.e. gapped liquid state. We show that by changing the way one derives the wavefunction from its parent CFT it is possible to obtain an incompressible candidate state when starting from a non-unitary parent. The construction mimics a global change of parameters in the phase space of the electron system. We explicit our construction in the case of the so-called Gaffnian state (a state for filling factor 2/5) and also for the Haldane-Rezayi state (a spin-singlet state at filling 1/2).

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