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Doped Kondo chain, a heavy Luttinger liquid.

ABSTRACT: The doped 1D Kondo Lattice describes complex competition between itinerant and magnetic ordering. The numerically computed wave vector-dependent charge and spin susceptibilities give insights into its low-energy properties. Similar to the prediction of the large N approximation, gapless spin and charge modes appear at the large Fermi wave vector. The highly suppressed spin velocity is a manifestation of "heavy" Luttinger liquid quasiparticles. A low-energy hybridization gap is detected at the small (conduction band) Fermi wave vector. In contrast to the exponential suppression of the Fermi velocity in the large-N approximation, we fit the spin velocity by a density-dependent power law of the Kondo coupling. The differences between the large-N theory and our numerical results are associated with the emergent magnetic Ruderman-Kittel-Kasuya-Yosida interactions.

SUBMITTER: Khait I

PROVIDER: S-EPMC5960294 | biostudies-literature | 2018 May

REPOSITORIES: biostudies-literature

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Doped Kondo chain, a heavy Luttinger liquid.

Khait Ilia I Azaria Patrick P Hubig Claudius C Schollwöck Ulrich U Auerbach Assa A

Proceedings of the National Academy of Sciences of the United States of America 20180430 20

The doped 1D Kondo Lattice describes complex competition between itinerant and magnetic ordering. The numerically computed wave vector-dependent charge and spin susceptibilities give insights into its low-energy properties. Similar to the prediction of the large N approximation, gapless spin and charge modes appear at the large Fermi wave vector. The highly suppressed spin velocity is a manifestation of "heavy" Luttinger liquid quasiparticles. A low-energy hybridization gap is detected at the sm ...[more]

PMID: 29712859

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