Nonequilibrium dynamics of a two-channel Kondo system due to a quantum quench

Zurab Ratiani, Aditi Mitra

    Research output: Contribution to journalArticle

    Abstract

    Recent experiments by Potok have demonstrated a remarkable tunability between a single-channel Fermi-liquid fixed point and a two-channel non-Fermi-liquid fixed point. Motivated by this we study the nonequilibrium dynamics due to a sudden quench of the parameters of a Hamiltonian from a single-channel to a two-channel anisotropic Kondo system. We find a distinct difference between the long-time behavior of local quantities related to the impurity spin as compared to that of bulk quantities related to the total (conduction electrons plus impurity) spin of the system. In particular, the local impurity spin and the local spin susceptibility are found to equilibrate but in a very slow power-law fashion which is peculiar to the non-Fermi-liquid properties of the Hamiltonian. In contrast, we find a lack of equilibration in the two-particle expectation values related to the total spin of the system.

    Original languageEnglish (US)
    Article number125110
    JournalPhysical Review B - Condensed Matter and Materials Physics
    Volume81
    Issue number12
    DOIs
    StatePublished - Mar 9 2010

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    Hamiltonians
    Impurities
    Fermi liquids
    impurities
    Liquids
    liquids
    Electrons
    conduction electrons
    magnetic permeability
    Experiments

    ASJC Scopus subject areas

    • Condensed Matter Physics
    • Electronic, Optical and Magnetic Materials

    Cite this

    Nonequilibrium dynamics of a two-channel Kondo system due to a quantum quench. / Ratiani, Zurab; Mitra, Aditi.

    In: Physical Review B - Condensed Matter and Materials Physics, Vol. 81, No. 12, 125110, 09.03.2010.

    Research output: Contribution to journalArticle

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