Kondo Effect in Quantum Dots Coupled to Ferromagnetic Leads

Martinek, J.; Utsumi, Yasuhiro; Imamura, Hiroshi; Barnaś, J.; Maekawa, Sadamichi; König, Jürgen; Schön, Gerd

doi:10.1103/physrevlett.91.127203

Cited by 341 publications

(562 citation statements)

References 30 publications

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“…2. The nonzero-bias maximum in dI/dV is in good agreement with previous EOM calculations, 11 except for the reduced width of splitting and the fine shape in the differential conductance. These inconsistences can be attributed to the significant change of the nonequilibrium DOS with increasing bias voltage [see Fig.…”

Section: B Linear and Nonlinear Conductancesupporting

confidence: 90%

Kondo-type transport through an interacting quantum dot coupled to ferromagnetic leads

Dong

Cui

Liu

et al. 2003

J. Phys.: Condens. Matter

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We investigate the equilibrium and out-of-equilibrium Kondo effects in a single-level interacting quantum dot connected to two ferromagnetic leads. Within the non-crossing approximation, we calculate the total density of states (DOS), the linear conductance, and the nonlinear differential conductance for both the parallel and the anti-parallel alignments of the spin polarization orientation in the leads, followed by a brief discussion regarding the validity of this approach. Numerical calculations show that for the anti-parallel alignment, a single Kondo peak always appears in the equilibrium DOS, resulting in the conventional temperature behavior in the linear conductance and the zero-bias maximum in the differential conductance. The strength of the DOS peak is gradually suppressed with increasing polarization, due to the fact that formation of the Kondocorrelated state is more difficult in the presence of higher polarization. On the contrary, for the parallel configuration the Kondo peak in the DOS descends precipitately and splits into two peaks to form a very steep valley between them. This splitting contributes to the appearance of a "hump" in the temperature-dependent linear conductance and a nonzero-bias maximum in the differential conductance. Moreover, application of a bias voltage can split each Kondo peak into two in the nonequilibrium DOS for both configurations. Finally we point out that the tunnel magnetoresistance could be an effective tool to demonstrate the different Kondo effects in different spin configurations found here.

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Section: B Linear and Nonlinear Conductancesupporting

confidence: 90%

Kondo-type transport through an interacting quantum dot coupled to ferromagnetic leads

Dong

Cui

Liu

et al. 2003

J. Phys.: Condens. Matter

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show abstract

“…9,11 does not affect transport in the case considered here. Spin precession does not appear since the leads are magnetized collinearly.…”

mentioning

confidence: 79%

Zero-bias anomaly in cotunneling transport through quantum-dot spin valves

et al. 2005

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We predict a new zero-bias anomaly in the differential conductance through a quantum dot coupled to two ferromagnetic leads with antiparallel magnetization. The anomaly differs in origin and properties from other anomalies in transport through quantum dots, such as the Kondo effect. It occurs in Coulomb-blockade valleys with an unpaired dot electron. It is a consequence of the interplay of single-and double-barrier cotunneling processes and their effect on the spin accumulation in the dot. The anomaly becomes significantly modified when a magnetic field is applied.

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“…53,54 We work in units of L + R = = 1. We adopt the following set of parameters d = −3.5 and D = 50.…”

Section: B Spectral Weights and Differential Conductancementioning

confidence: 99%

Nonequilibrium spin-current detection with a single Kondo impurity

et al. 2013

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We present a theoretical study based on the Anderson model of the transport properties of a Kondo impurity (atom or quantum dot) connected to ferromagnetic leads, which can sustain a nonequilibrium spin current. We analyze the case where the spin current is injected by an external source and when it is generated by the voltage bias. Due to the presence of ferromagnetic contacts, a static exchange field is produced that eventually destroys the Kondo correlations. We find that such a field can be compensated by an appropriated combination of the spin-dependent chemical potentials leading to the restoration of the Kondo resonance. In this respect, a Kondo impurity may be regarded as a very sensitive sensor for nonequilibrium spin phenomena.

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Kondo Effect in Quantum Dots Coupled to Ferromagnetic Leads

Cited by 341 publications

References 30 publications

Kondo-type transport through an interacting quantum dot coupled to ferromagnetic leads

Kondo-type transport through an interacting quantum dot coupled to ferromagnetic leads

Zero-bias anomaly in cotunneling transport through quantum-dot spin valves

Nonequilibrium spin-current detection with a single Kondo impurity

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