Topological nonmagnetic impurity states in topological Kondo insulators

Abele, M.; Yuan, X.; Riseborough, Peter S.

doi:10.1103/PhysRevB.101.094101

Title: Topological nonmagnetic impurity states in topological Kondo insulators

Journal Article · Mon Mar 02 00:00:00 EST 2020 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.101.094101· OSTI ID:1617903

Abele, M. ^[1];

^[1]; Riseborough, Peter S. ^[1]

Temple Univ., Philadelphia, PA (United States)

We examine here the presence of nonmagnetic impurities in a hybridization gap model of a Kondo insulator which has band inversion. The model has been used to predict that SmB₆ is a topological insulator. We show that there are two types of nonmagnetic impurity states in a Kondo insulator. The type of states can be categorized as deep impurity states, similar to the impurity states in an ordinary metal, and impurity states which have energies within the hybridization gap. Unlike the deep impurity states which only form if the impurity potential exceeds a critical value of the order of the conduction bandwidth, the in-gap impurity states form for exceptionally small values of the impurity potential comparable to the hybridization gap. This finding may explain why Kondo insulators are found to be exceptionally sensitive to impurities. We demonstrate that these in-gap states are caused by band inversion and have properties similar to those expected for impurities in a topological insulator.

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Research Organization:: Temple Univ., Philadelphia, PA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division

Grant/Contract Number:: FG02-01ER45872

OSTI ID:: 1617903

Alternate ID(s):: OSTI ID: 1602362

Journal Information:: Physical Review B, Vol. 101, Issue 9; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 8 works

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References (63)

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