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Kondo Impurities Coupled to a Helical Luttinger Liquid: RKKY-Kondo Physics Revisited
Oleg M Yevtushenko1, Vladimir I Yudson2,3
1Ludwig Maximilians University, Arnold Sommerfeld Center and Center for Nano-Science, Munich DE-80333, Germany.
Abstract:
We show that the paradigmatic Ruderman-Kittel-Kasuya-Yosida (RKKY) description of two local magnetic moments coupled to propagating electrons breaks down in helical Luttinger liquids when the electron interaction is stronger than some critical value. In this novel regime, the Kondo effect overwhelms the RKKY interaction over all macroscopic interimpurity distances. This phenomenon is a direct consequence of the helicity (realized, for instance, at edges of a time-reversal invariant topological insulator) and does not take place in usual (nonhelical) Luttinger liquids.
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