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• W3213615078 abstract "We theoretically demonstrate non-Hermitian indirect interaction between two magnetic impurities placed at the interface between a 3D topological insulator and a ferromagnetic metal. The coupling of topological insulator and the ferromagnet introduces not only Zeeman exchange field on the surface states but also broadening to transfer the charge and spin between the surface states of the topological insulator and the metallic states of the ferromagnet. While the former provides bandgap at the charge neutrality point, the latter causes non-Hermiticity. Using the Green's function method, we calculate the range functions of magnetic impurity interactions. We show that the charge decay rate provides a coupling between evanescent modes near the bandgap and traveling modes near the band edge. However, the spin decay rate induces a stronger coupling than the charge decay rate so that higher energy traveling modes can be coupled to lower energy evanescent ones. This results in a non-monotonic behavior of the range functions in terms of distance and decay rates in the subgap regime. In the over gap regime, depending on the type of decay rate and on the distance, the amplitude of spatial oscillations would be damped or promoted." @default.
• W3213615078 created "2021-11-22" @default.
• W3213615078 creator A5008274132 @default.
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• W3213615078 date "2021-11-12" @default.
• W3213615078 modified "2023-10-18" @default.
• W3213615078 title "Non-Hermitian indirect exchange interaction in a topological insulator coupled to a ferromagnetic metal" @default.
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• W3213615078 doi "https://doi.org/10.1038/s41598-021-01591-x" @default.
• W3213615078 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/8589957" @default.
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• W3213615078 hasPublicationYear "2021" @default.
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