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arXiv 1206.2646cond-mat.str-el
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拓扑绝缘体表面的强关联和体-边界对应的破坏

Strong correlations at topological insulator surfaces and the breakdown of the bulk-boundary correspondence

Manuel J. Schmidt

摘要:

讨论了三维拓扑绝缘体表面强关联的判据。通常,在这样的表面上的库仑排斥力太弱而不能驱动相变到强关联区域。我讨论的机制和可能性,其实验实施的库仑相互作用的强度可以在很宽的范围内进行调整。在强相互作用的制度,表面状态是带隙的,即使散装能带结构的拓扑分类预测无带隙的表面状态。

英文摘要:

The criteria for strong correlations on surfaces of three-dimensional topological insulators are discussed. Usually, the Coulomb repulsion at such surfaces is too weak for driving a phase transition to a strongly correlated regime. I discuss a mechanism and possibilities of its experimental implementation by which the strength of the Coulomb interaction can be tuned over a wide range. In the strongly interacting regime, the surface states are gapped, even though the topological classification of the bulk band structure predicts gapless surface states.

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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