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Nonlinear spin susceptibility in topological insulators
Stockholm University, Nordic Institute for Theoretical Physics (Nordita). Uppsala University, Sweden; Institute for Research in Fundamental Sciences (IPM), Iran.
Number of Authors: 42018 (English)In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 97, no 18, article id 180402Article in journal (Refereed) Published
Abstract [en]

We revise the theory of the indirect exchange interaction between magnetic impurities beyond the linear response theory to establish the effect of impurity resonances in the surface states of a three-dimensional topological insulator. The interaction is composed of isotropic Heisenberg, anisotropic Ising, and Dzyaloshinskii-Moriya types of couplings. We find that all three contributions are finite at the Dirac point, which is in stark contrast to the linear response theory which predicts a vanishing Dzyaloshinskii-Moriya-type contribution. We show that the spin-independent component of the impurity scattering can generate large values of the Dzyaloshinskii-Moriya-type coupling in comparison with the Heisenberg and Ising types of couplings, while these latter contributions drastically reduce in magnitude and undergo sign changes. As a result, both collinear and noncollinear configurations are allowed magnetic configurations of the impurities.

Place, publisher, year, edition, pages
2018. Vol. 97, no 18, article id 180402
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-156800DOI: 10.1103/PhysRevB.97.180402ISI: 000432024200001OAI: oai:DiVA.org:su-156800DiVA, id: diva2:1211095
Available from: 2018-05-30 Created: 2018-05-30 Last updated: 2018-05-30Bibliographically approved

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