首页|RKKY interaction in helical higher-order topological insulators
RKKY interaction in helical higher-order topological insulators
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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.
magnetic impurity interactionsmagnetic orderingspintronicstopological phases
金莎、李健、李清旭、朱家骥
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School of Science,Chongqing University of Posts and Telecommunications,Chongqing 400065,China
Institute for Advanced Sciences,Chongqing University of Posts and Telecommunications,Chongqing 400065,China
Southwest Center for Theoretical Physics,Chongqing University,Chongqing 401331,China
research foundation of Institute for Advanced Sciences of CQUPT
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