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arXiv 2104.01236cond-mat.dis-nncond-mat.mes-hallcond-mat.stat-mech
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再论平带与国产化

Revisiting Flat bands and localization

Yasuhiro Hatsugai

摘要:

平坦带意味着由于一些约束而缺乏巡回性,这些约束在原则上导致具有随机性的异常行为。通过平带系统的分子轨道(MO)表示,引入随机MO模型,其中由于平带的简并性即使具有随机性也被保持。具有亚晶格不平衡的手征对称系统的零模属于这一类。在解释了一般的平带结构的MO,几个例子进行了讨论与数值演示,作为在一维的超烧绿石晶格和超烧绿石晶格在任何$d$ -维扩展的Kagome($d=2$)和烧绿石($d=3$)晶格的一般尺寸。

英文摘要:

Flat bands imply lack of itinerancy due to some constraints that, in principle, results in anomalous behaviors with randomness. By a molecular orbital (MO) representation of the flat band systems, random MO models are introduced where the degeneracy due to the flat bands is preserved even with randomness. The zero modes of the chiral symmetric system with sublattice imbalance belong to the class. After explaining the generic flat band construction by MOs, several examples are discussed with numerical demonstration as sawtooth lattice in one dimension and hyper-Pyrochlore lattice in any $d$-dimensions that extends the Kagome ($d=2$) and Pyrochlore ($d=3$) lattices to general dimensions.

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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