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RKKY interaction on the surface of three-dimensional Dirac semimetals
KTH, School of Engineering Sciences (SCI), Physics. Univ Paris Sud, Univ Paris Saclay, Lab Phys Solides, CNRS, F-91405 Orsay, France..
Aalto Univ, Dept Appl Phys LTL, POB 15100, FI-00076 Aalto, Finland.;Ioffe Phys Tech Inst, St Petersburg 194021, Russia..
Univ Paris Sud, Univ Paris Saclay, Lab Phys Solides, CNRS, F-91405 Orsay, France..
2019 (English)In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 99, no 16, article id 165302Article in journal (Refereed) Published
Abstract [en]

We study the RKKY interaction between two magnetic impurities located on the surface of a three-dimensional Dirac semimetal with two Dirac nodes in the band structure. By taking into account both bulk and surface contributions to the exchange interaction between the localized spins, we demonstrate that the surface contribution in general dominates the bulk one at distances larger than the inverse node separation due to a weaker power-law decay. We find a strong anisotropy of the surface term with respect to the spins being aligned along the node separation axis or perpendicular to it. In the many impurity dilute regime, this implies formation of quasi-one-dimensional magnetic stripes orthogonal to the node axis. We also discuss the effects of a surface spin-mixing term coupling electrons from spin-degenerate Fermi arcs.

Place, publisher, year, edition, pages
AMER PHYSICAL SOC , 2019. Vol. 99, no 16, article id 165302
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-249788DOI: 10.1103/PhysRevB.99.165302ISI: 000463887100007Scopus ID: 2-s2.0-85064138575OAI: oai:DiVA.org:kth-249788DiVA, id: diva2:1306662
Note

QC 20190424

Available from: 2019-04-24 Created: 2019-04-24 Last updated: 2019-04-24Bibliographically approved

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