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arXiv 1202.5543cond-mat.str-elhep-th
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拓扑绝缘体的D-代数结构

D-Algebra Structure of Topological Insulators

B. Estienne, N. Regnault, B. A. Bernevig

摘要:

在量子霍尔效应中,不同波矢处的密度算符一般不对易,从而产生了具有重要结果的Girvin MacDonald Plazmann(GMP)代数,如分数填充分数处的基态质心简并,以及填充朗道能级的W_{1 + \infty}对称性。我们表明,自然推广的GMP代数高维拓扑绝缘体涉及的D-代数的概念,通过使用完全反对称张量在D-维。对于偶数维空间中的绝缘体,D-代数是各向同性的,并且对于常数非阿贝尔F(k)^ F(k). ^ F(k)联络(D-Berry曲率),其结构因子与D/2-Chern数成正比。在奇数维中,代数不是迷向的,包含弱拓扑绝缘体指数(拓扑绝缘体的层在少一个维度中),并且不包含陈-西蒙斯θ形式(F ^ A - 2/3 A ^ A ^ A在3维中)。Chern-Simons形式出现在平行迁移和简单平移算子的某种组合中,而这种组合不是代数。还讨论了D维保体积同构与扩展对象并行传输的可能关系。

英文摘要:

In the quantum Hall effect, the density operators at different wave-vectors generally do not commute and give rise to the Girvin MacDonald Plazmann (GMP) algebra with important consequences such as ground-state center of mass degeneracy at fractional filling fraction, and W_{1 + \infty} symmetry of the filled Landau levels. We show that the natural generalization of the GMP algebra to higher dimensional topological insulators involves the concept of a D-algebra formed by using the fully anti-symmetric tensor in D-dimensions. For insulators in even dimensional space, the D-algebra is isotropic and closes for the case of constant non-Abelian F(k) ^ F(k) ... ^ F(k) connection (D-Berry curvature), and its structure factors are proportional to the D/2-Chern number. In odd dimensions, the algebra is not isotropic, contains the weak topological insulator index (layers of the topological insulator in one less dimension) and does not contain the Chern-Simons θform (F ^ A - 2/3 A ^ A ^ A in 3 dimensions). The Chern-Simons form appears in a certain combination of the parallel transport and simple translation operator which is not an algebra. The possible relation to D-dimensional volume preserving diffeomorphisms and parallel transport of extended objects is also discussed.

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