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arXiv 1107.2969cond-mat.str-el
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拓扑绝缘体薄膜中的量子霍尔超流体

Quantum Hall Superfluids in Topological Insulator Thin Films

Dagim Tilahun, Byounghak Lee, E. M. Hankiewicz, A. H. MacDonald

摘要:

三维拓扑绝缘体具有受保护的Dirac锥表面态。本文提出了磁场诱导的拓扑绝缘体薄膜有序态,其中上下表面之间自发地建立了相干。我们发现,这些材料的大介电常数增加层分离范围内的相干生存和降低超流声速,但对超流密度或电荷间隙的影响不大。在总朗道能级填充因子$ν_T=0$的相干态被预测为无边缘模式,定性地改变其输运现象。

英文摘要:

Three-dimensional topological insulators have protected Dirac-cone surface states. In this paper we propose magnetic field induced topological insulator thin film ordered states in which coherence is established spontaneously between top and bottom surfaces. We find that the large dielectric constants of these materials increases the layer separation range over which coherence survives and decreases the superfluid sound velocity, but has little influence on superfluid density or charge gap. The coherent state at total Landau-level filling factor $ν_T=0$ is predicted to be free of edge modes, qualitatively altering its transport phenomenology.

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