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arXiv 1712.04136math-phcond-mat.dis-nnmath.MP
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一般非周期离散系统的非交换Chern数

Non-Commutative Chern Numbers for Generic Aperiodic Discrete Systems

Chris Bourne, Emil Prodan

摘要:

凝聚态物理界正在积极地寻找非周期性材料和超材料中的强拓扑相。在这项工作中,我们首先介绍的概念图案谐振器作为一个统一的理论框架拓扑电子,光子,声子等(非周期性)系统。然后,我们讨论,在物理方面,背后的哲学算子理论分析用于系统化这样的系统。一个模型计算的霍尔电导的2维非晶晶格,在那里我们提出了其量化的迁移率间隙制度的数值证据。受这些事实的启发,我们提出了我们的工作的主要结果,这是扩展的陈数公式的哈密顿晶格没有一个典型的标签的网站,连同指数定理,确保这些陈数的量化和稳定性的流动性间隙制度。我们的研究结果涵盖了广泛的应用,特别是那些涉及准晶体,非晶以及合成(即算法生成)晶格。

英文摘要:

The search for strong topological phases in generic aperiodic materials and meta-materials is now vigorously pursued by the condensed matter physics community. In this work, we first introduce the concept of patterned resonators as a unifying theoretical framework for topological electronic, photonic, phononic etc. (aperiodic) systems. We then discuss, in physical terms, the philosophy behind an operator theoretic analysis used to systematize such systems. A model calculation of the Hall conductance of a 2-dimensional amorphous lattice is given, where we present numerical evidence of its quantization in the mobility gap regime. Motivated by such facts, we then present the main result of our work, which is the extension of the Chern number formulas to Hamiltonians associated to lattices without a canonical labeling of the sites, together with index theorems that assure the quantization and stability of these Chern numbers in the mobility gap regime. Our results cover a broad range of applications, in particular, those involving quasi-crystalline, amorphous as well as synthetic (i.e. algorithmically generated) lattices.

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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