Nonequilibrium Kondo effect in a magnetic field: Auxiliary master equation approach

Delia Maria Fugger, Antonius Dorda, Frauke Schwarz, Jan von Delft, Enrico Arrigoni

Publikation: Beitrag in einer FachzeitschriftArtikelForschungBegutachtung

Abstract

We study the single-impurity Anderson model out of equilibrium under the influence of a bias voltage φ and a magnetic field B. We investigate the interplay between the shift (ω_B) of the Kondo peak in the spin-resolved density of states (DOS) and the one (φ_B) of the conductance anomaly. In agreement with experiments and previous theoretical calculations we find that, while the latter displays a rather linear behavior with an almost constant slope as a function of B down to the Kondo scale, the DOS shift first features a slower increase reaching the same behavior as φ_B only for |g| μ_B B << k_B T_K.Our auxiliary master equation approach yields highly accurate nonequilibrium results for the DOS and for the conductance all the way from within the Kondo up to the charge fluctuation regime, showing excellent agreement with a recently introduced scheme based on a combination of numerical renormalization group with time-dependent density matrix renormalization group.
Originalspracheenglisch
Aufsatznummer013030
Seitenumfang12
FachzeitschriftNew journal of physics
Jahrgang20
Ausgabenummer1
DOIs
PublikationsstatusVeröffentlicht - 22 Jan 2018

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Kondo effect
magnetic fields
shift
anomalies
slopes
impurities
electric potential

Schlagwörter

    ASJC Scopus subject areas

    • !!Condensed Matter Physics

    Fields of Expertise

    • Advanced Materials Science

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    Nonequilibrium Kondo effect in a magnetic field : Auxiliary master equation approach. / Fugger, Delia Maria; Dorda, Antonius; Schwarz, Frauke; von Delft, Jan; Arrigoni, Enrico.

    in: New journal of physics , Jahrgang 20, Nr. 1, 013030, 22.01.2018.

    Publikation: Beitrag in einer FachzeitschriftArtikelForschungBegutachtung

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    keywords = "Anderson impurity model, nonequilibrium steady state, Zeeman magnetic field, spectral shift, conductance splitting, Kondo effect, auxiliary master equation approach",
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    T1 - Nonequilibrium Kondo effect in a magnetic field

    T2 - Auxiliary master equation approach

    AU - Fugger, Delia Maria

    AU - Dorda, Antonius

    AU - Schwarz, Frauke

    AU - von Delft, Jan

    AU - Arrigoni, Enrico

    PY - 2018/1/22

    Y1 - 2018/1/22

    N2 - We study the single-impurity Anderson model out of equilibrium under the influence of a bias voltage φ and a magnetic field B. We investigate the interplay between the shift (ω_B) of the Kondo peak in the spin-resolved density of states (DOS) and the one (φ_B) of the conductance anomaly. In agreement with experiments and previous theoretical calculations we find that, while the latter displays a rather linear behavior with an almost constant slope as a function of B down to the Kondo scale, the DOS shift first features a slower increase reaching the same behavior as φ_B only for |g| μ_B B << k_B T_K.Our auxiliary master equation approach yields highly accurate nonequilibrium results for the DOS and for the conductance all the way from within the Kondo up to the charge fluctuation regime, showing excellent agreement with a recently introduced scheme based on a combination of numerical renormalization group with time-dependent density matrix renormalization group.

    AB - We study the single-impurity Anderson model out of equilibrium under the influence of a bias voltage φ and a magnetic field B. We investigate the interplay between the shift (ω_B) of the Kondo peak in the spin-resolved density of states (DOS) and the one (φ_B) of the conductance anomaly. In agreement with experiments and previous theoretical calculations we find that, while the latter displays a rather linear behavior with an almost constant slope as a function of B down to the Kondo scale, the DOS shift first features a slower increase reaching the same behavior as φ_B only for |g| μ_B B << k_B T_K.Our auxiliary master equation approach yields highly accurate nonequilibrium results for the DOS and for the conductance all the way from within the Kondo up to the charge fluctuation regime, showing excellent agreement with a recently introduced scheme based on a combination of numerical renormalization group with time-dependent density matrix renormalization group.

    KW - Anderson impurity model, nonequilibrium steady state, Zeeman magnetic field, spectral shift, conductance splitting, Kondo effect, auxiliary master equation approach

    U2 - 10.1088/1367-2630/aa9fdc

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    JO - New journal of physics

    JF - New journal of physics

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    M1 - 013030

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