Abstract
We theoretically investigate the Ruderman-Kittel-Kasuya-Yosida(RKKY)interaction in helical higher-order topo-logical insulators(HOTIs),revealing distinct behaviors mediated by hinge and Dirac-type bulk carriers.Our findings show that hinge-mediated interactions consist of Heisenberg,Ising,and Dzyaloshinskii-Moriya(DM)terms,exhibiting a decay with impurity spacing z and oscillations with Fermi energy εF.These interactions demonstrate ferromagnetic behaviors for the Heisenberg and Ising terms and alternating behavior for the DM term.In contrast,bulk-mediated interactions include Heisenberg,twisted Ising,and DM terms,with a conventional cubic oscillating decay.This study highlights the nuanced interplay between hinge and bulk RKKY interactions in HOTIs,offering insights into designs of next-generation quantum devices based on HOTIs.
基金项目
research foundation of Institute for Advanced Sciences of CQUPT(E011A2022328)
NETL
NSTL
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