Kondo Impurities Coupled to a Helical Luttinger Liquid: RKKY-Kondo Physics Revisited

Yevtushenko, Oleg M. und Yudson, Vladimir I. (2018): Kondo Impurities Coupled to a Helical Luttinger Liquid: RKKY-Kondo Physics Revisited. In: Physical Review Letters, Bd. 120, Nr. 14, 147201

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.

• Dokumententyp: Zeitschriftenartikel
• Fakultät: Physik
• Themengebiete: 500 Naturwissenschaften und Mathematik > 530 Physik
• ISSN: 0031-9007
• Sprache: Englisch