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Zheng, Shi-Han; Deng, Ming-Xun; Qiu, Jian-Ming; Zhong, Qing-Hu; Yang, Mou; Wang, Rui-Qiang

Interplay of quantum impurities and topological surface modes. (English) Zbl 1349.82011

Phys. Lett., A 379, No. 43-44, 2890-2896 (2015).
Summary: The interplay of an Anderson quantum impurity with topological surface modes is studied. We find that the quantum impurity scattering can locally destroy the Dirac electron spectra by creating a significant resonance exactly at the Dirac point, in stark contrast to the case of classic impurities. When an external magnetic field is applied to the topological insulator (TI) surfaces, a bound state is found either at the gap edges or within the gap. We discuss the coexistence of the Kondo resonance and the bound state and their effect on TI local density of states.

MSC:

82B10 Quantum equilibrium statistical mechanics (general)

Keywords:

quantum impurity; topological insulators; electronic density of states
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Full Text: DOI

References:

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