RKKY to Kondo crossover in helical edge of a topological insulator

Ferrer, Pol Alonso-Cuevillas; Yevtushenko, Oleg M.; Weichselbaum, Andreas

doi:10.1103/PhysRevResearch.5.033016

Title: RKKY to Kondo crossover in helical edge of a topological insulator

Journal Article · Mon Jul 10 00:00:00 EDT 2023 · Physical Review Research

DOI:https://doi.org/10.1103/PhysRevResearch.5.033016· OSTI ID:1989073

Ferrer, Pol Alonso-Cuevillas; Yevtushenko, Oleg M.;

Two spatially separated magnetic impurities coupled to itinerant electrons give rise to a dynamically generated exchange (RKKY) inter-impurity interaction that competes with the individual Kondo screening of the impurities. It has been recently shown by Yevtushenko and Yudson (2018) [1], that the RKKY interaction and the RKKY vs. Kondo competition become nontrivial on helical edges of two-dimensional topological insulators where there is lock-in relation between the electron spin and its direction of motion. Kondo screening always takes over and dominates at large inter-impurity distances and it can also dominate all the way to short distances if the Kondo coupling is sufficiently large and anisotropic. In the present paper, we study the Kondo-RKKY competition in detail on a qualitative and quantitative level. For this we employ the numerically exact numerical renormalization group (NRG) for a broad parameter scan of two Kondo coupled impurities vs. magnetic anisotropy, impurity distance and temperature, and comment on the role of finite bandwidth. We give a pedagogical introduction on the the setup of the two-impurity setting within the NRG in the helical context. Overall we establish a plain crossover from RKKY to Kondo with increasing impurity distance which permits an intuitive physical picture by simply comparing length scales set by the Kondo screening cloud vs. the thermal length scale vs. the impurity distance.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0012704

OSTI ID:: 1989073

Alternate ID(s):: OSTI ID: 1983766

Report Number(s):: BNL-224446-2023-JAAM; PPRHAI; 033016

Journal Information:: Physical Review Research, Journal Name: Physical Review Research Vol. 5 Journal Issue: 3; ISSN 2643-1564

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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