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arXiv 2001.01915cond-mat.str-el
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$ν= 5/2$量子霍尔效应的压缩粒子-空穴对称Pfiran态

A Compressed Particle-Hole Symmetric Pfaffian State for $ν= 5/2$ Quantum Hall Effect

Jian Yang

摘要:

最近的热霍尔电导实验[Banerjee等人,Nature { \bf 559},205(2018)]对于$ν= 5/2$分数量子Hall系统似乎排除了Pfweian和反Pfweian,并且有利于PH-Pfweian拓扑顺序,而没有无序的现有数值结果则显示出相反的结果。在本文中,我们提供了一个可能的解决方案,提出了一个新的状态,称为压缩PH-Pfronan状态通过“压缩”的PH-Pfronan状态与两个通量量子删除创建两个阿贝尔Laughlin型准粒子的最大避免彼此(或最大数量的零)。压缩态不是粒子-空穴对称的,但具有PH-Pfronan拓扑序.在球面几何中,压缩的PH-Pfiran态具有与Pfiran态相同的磁通量数$N_ϕ= 2N-3$,允许两种状态之间的直接数值比较。在第二朗道能级上对有限无无序系统进行精确对角化的结果表明,通过增加库仑相互作用的短程分量,基态经历了从Pfronan态到压缩PH-Pfronan态的相变,然后进一步进入无隙态.低能能隙激发态是由阿贝尔Laughlin型准粒子分裂为两个非阿贝尔准粒子的结果。

英文摘要:

A recent thermal Hall conductance experiment [Banerjee et al., Nature {\bf559}, 205 (2018)] for $ν= 5/2$ fractional quantum Hall system appears to rule out both the Pfaffian and anti-Pfaffian and be in favor of the PH-Pfaffian topological order, while the existing numerical results without disorder have shown otherwise. In this paper we offer a possible resolution by proposing a new state, termed compressed PH-Pfaffian state by "compressing" the PH-Pfaffian state with two flux quanta removed to create two abelian Laughlin type quasiparticles of the maximum avoidance from one another (or of the maximum number of zeros). The compressed PH-Pfaffian state is not particle-hole symmetric but possesses the PH-Pfaffian topological order. In spherical geometry, the compressed PH-Pfaffian state has the same magnetic flux number $N_ϕ= 2N-3$ as the Pfaffian state, allowing a direct numerical comparison between the two states. Results of exact diagonalization of finite disorder-free systems in the second Landau level show that, by increasing the short range component of the Coulomb interaction, the ground state undergoes a phase transition from the Pfaffian state to the compressed PH-Pfaffian state before further entering into a gapless state. The low energy gapped excited states result from the breakup of the abelian Laughlin type quasiparticle into two non-abelian quasiparticles.

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