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arXiv 2005.10826cond-mat.str-elcond-mat.mes-hallhep-th
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$ν=5/2$附近分数量子Hall系统的有效场论

An Effective Field Theory for Fractional Quantum Hall Systems near $ν=5/2$

Po-Shen Hsin, Ying-Hsuan Lin, Natalie M. Paquette, Juven Wang

摘要:

我们提出了一个分数量子霍尔系统的有效场论(EFT)附近的填充分数$ν=5/2$,流到相关的IR候选阶段,包括非阿贝尔的Pfiran,反Pfiran,粒子空穴Pfiran状态(Pf,APf和PHPf)。我们的EFT有一个2+1 $d$ O(2)$_{2,L}$ Chern-Simons规范理论通过一个离散的电荷共轭规范场耦合到四个Majorana费米子上,带有Gross-Neveu-Yukawa-Higgs项。包括通过希格斯凝聚和费米子质量项的变形,我们可以绘制出一个可调参数的相图,再现了最近提出的渗流图像及其无间隙拓扑量子相变的预测。我们的EFT捕获已知的功能,无间隙和有间隙的部门的时间反转打破域壁之间的Pf和APf阶段。此外,我们发现,Pf $\mid$ APf域壁有更高的张力比域壁在PHPf阶段。然后,前者,如果形成,可能会过渡到积极有利的PHPf域壁;这可能,反过来,有助于进一步诱导大量过渡到PHPf。

英文摘要:

We propose an effective field theory (EFT) of fractional quantum Hall systems near the filling fraction $ν=5/2$ that flows to pertinent IR candidate phases, including non-abelian Pfaffian, anti-Pfaffian, and particle-hole Pfaffian states (Pf, APf, and PHPf). Our EFT has a 2+1$d$ O(2)$_{2,L}$ Chern-Simons gauge theory coupled to four Majorana fermions by a discrete charge conjugation gauge field, with Gross-Neveu-Yukawa-Higgs terms. Including deformations via a Higgs condensate and fermion mass terms, we can map out a phase diagram with tunable parameters, reproducing the prediction of the recently-proposed percolation picture and its gapless topological quantum phase transitions. Our EFT captures known features of both gapless and gapped sectors of time-reversal-breaking domain walls between Pf and APf phases. Moreover, we find that Pf$\mid$APf domain walls have higher tension than domain walls in the PHPf phase. Then the former, if formed, may transition to the energetically-favored PHPf domain walls; this could, in turn, help further induce a bulk transition to PHPf.

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