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arXiv 1210.0907cond-mat.str-elcond-mat.mes-hallhep-th
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玻色子双量子霍尔态之间的量子相变

Quantum Phase Transition between Integer Quantum Hall States of Bosons

Tarun Grover, Ashvin Vishwanath

摘要:

玻色子量子霍尔(英语:Bosonic Quantum Hall,简称IQH)相是一类对称保护拓扑(英语:symmetry protected topological,简称SPT)相,与费米子量子霍尔态类似,支持量子化霍尔电导。然而,它们需要互动才能实现。在这里,我们研究了一个平凡的绝缘体和玻色子IQH相之间的量子霍尔平台跃迁,在一个干净的系统。一般来说,我们会发现一个介入的超流体相。然而,额外的对称性的存在可能导致这些相之间的直接过渡。我们采用一个费米部分子描述,捕捉绝缘相以及它们之间的过渡。临界理论是Nf = 2费米子味的无质量QED-3。费米子有一个令人惊讶的简单解释-它们是超流体的漩涡。因此,假设跃迁是连续的,跃迁处的普适电导率等于QED-3中狄拉克费米子的普适电阻率。我们还简要地评论了西格玛模型描述的过渡和相关的三维SPT相的表面状态。

英文摘要:

Bosonic Integer Quantum Hall (IQH) phases are a class of symmetry protected topological (SPT) phases that, similar to the fermionic IQH states, support a quantized Hall conductance. They, however, require interactions for their realization. Here we study quantum Hall plateau transitions between a trivial insulator and a bosonic IQH phase, in a clean system. Generically, we find an intervening superfluid phase. The presence of additional symmetries, however, can potentially lead to a direct transition between these phases. We employ a fermionic parton description that captures both the insulating phases as well as the transition between them. The critical theory is massless QED-3 with Nf = 2 fermion flavors. The fermions have a surprisingly simple interpretation - they are vortices of the superfluid. Therefore the universal conductivity at the transition, assuming it is continuous, equals the universal resistivity of Dirac fermions in QED-3. We also briefly comment on sigma model descriptions of the transition and the surface states of related 3D SPT phases.

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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