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arXiv 1502.05404cond-mat.str-elhep-th
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粒子-空穴对称性与复合费米液体

Particle-Hole Symmetry and the Composite Fermi Liquid

Maissam Barkeshli, Michael Mulligan, Matthew P. A. Fisher

摘要:

半满朗道能级被广泛认为是由复合费米液体(CFL)的Halperin-Lee-Read理论描述的。在本文中,我们开发了一个理论的粒子-空穴共轭的CFL,反CFL,我们认为是一个不同的阶段的物质相比,CFL。反CFL提供了一个可能的解释最近的实验[Kamburov et.例如,物理修订版信函113,196801(2014)]证明了GaAs量子阱中复合费米子的密度对应于填充分数$ν< 1/2$时的电子密度和填充分数$ν> 1/2$时的空穴密度。我们引入了一个在边界存在下的CFL和Anti-CFL的局域场论,我们用它来研究CFL-绝缘体-CFL结,以及Anti-CFL和CFL之间的界面。我们表明,CFL-反CFL接口允许部分熔融的边界相,其中“复合电子”可以直接隧道到“复合孔”,提供了一个非平凡的例子,拓扑结构不同的准粒子之间的嬗变。我们讨论了几个可观察到的反CFL的后果,包括预测的电阻率跳跃在一阶过渡均匀CFL和反CFL阶段之间。我们还提出了一个理论的CFL和反CFL之间的连续量子相变。我们的结论是,粒子-空穴对称性需要一个修改后的观点的半满朗道水平,在存在强的电子-电子相互作用和弱的无序,作为一个临界点之间的CFL和反CFL。

英文摘要:

The half-filled Landau level is widely believed to be described by the Halperin-Lee-Read theory of the composite Fermi liquid (CFL). In this paper, we develop a theory for the particle-hole conjugate of the CFL, the Anti-CFL, which we argue to be a distinct phase of matter as compared with the CFL. The Anti-CFL provides a possible explanation of a recent experiment [Kamburov et. al., Phys. Rev. Lett. 113, 196801 (2014)] demonstrating that the density of composite fermions in GaAs quantum wells corresponds to the electron density when the filling fraction $ν< 1/2$ and to the hole density when $ν> 1/2$. We introduce a local field theory for the CFL and Anti-CFL in the presence of a boundary, which we use to study CFL - Insulator - CFL junctions, and the interface between the Anti-CFL and CFL. We show that the CFL - Anti-CFL interface allows partially fused boundary phases in which "composite electrons" can directly tunnel into "composite holes," providing a non-trivial example of transmutation between topologically distinct quasiparticles. We discuss several observable consequences of the Anti-CFL, including a predicted resistivity jump at a first order transition between uniform CFL and Anti-CFL phases. We also present a theory of a continuous quantum phase transition between the CFL and Anti-CFL. We conclude that particle-hole symmetry requires a modified view of the half-filled Landau level, in the presence of strong electron-electron interactions and weak disorder, as a critical point between the CFL and the Anti-CFL.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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