Kondo effect in quantum dots coupled to ferromagnetic leads with noncollinear magnetizations

Świrkowicz, R.; Wilczyński, M.; Wawrzyniak, M.; Barnaś, J.

doi:10.1103/physrevb.73.193312

Cited by 70 publications

(81 citation statements)

References 28 publications

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“…The possibility of the Kondo effect in a quantum dot attached to ferromagnetic electrodes was discussed in a number of papers [137,139,143,212,229,230,231,232,233,234,235]. It was shown, that the Kondo resonance in the parallel configuration is split and suppressed in the presence of ferromagnetic leads [139,231,232,235,234].…”

Section: Multi-level Quantum Dots Based On Single-wall Carbon Nanotubesmentioning

confidence: 99%

“…spin accumulation, parity effect on tunnel magnetoresistance, zero-bias anomaly in the Coulomb blockade regime, exchange field, splitting of the Kondo anomaly, and others. Most of the works concerned theoretical description of spin-polarized transport in the weak coupling regime, as well as in the strong coupling regime, where the Kondo physics emerges [137,138,139,140,141,142,143,144,145]. Sequential transport through a single-level quantum dot coupled to ferromagnetic leads was studied for both collinear [146,147] and non-collinear [148,149,150,151,152,153] configurations of the electrodes' magnetic moments.…”

Section: Spin Polarized Transport Through Single-level Quantum Dots Cmentioning

confidence: 99%

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Spin effects in single-electron tunnelling

Barnaś¹,

Weymann²

2008

J. Phys.: Condens. Matter

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Abstract. An important consequence of the discovery of giant magnetoresistance in metallic magnetic multilayers is a broad interest in spin dependent effects in electronic transport through magnetic nanostructures. An example of such systems are tunnel junctions -single-barrier planar junctions or more complex ones. In this review we present and discuss recent theoretical results on electron and spin transport through ferromagnetic mesoscopic junctions including two or more barriers. Such systems are also called ferromagnetic single-electron transistors. We start from the situation when the central part of a device has the form of a magnetic (or nonmagnetic) metallic nanoparticle. Transport characteristics reveal then single-electron charging effects, including the Coulomb staircase, Coulomb blockade, and Coulomb oscillations. Single-electron ferromagnetic transistors based on semiconductor quantum dots and large molecules (especially carbon nanotubes) are also considered. The main emphasis is placed on the spin effects due to spin-dependent tunnelling through the barriers, which gives rise to spin accumulation and tunnel magnetoresistance. Spin effects also occur in the current-voltage characteristics, (differential) conductance, shot noise, and others. Transport characteristics in the two limiting situations of weak and strong coupling are of particular interest. In the former case we distinguish between the sequential tunnelling and cotunnelling regimes. In the strong coupling regime we concentrate on the Kondo phenomenon, which in the case of transport through quantum dots or molecules leads to an enhanced conductance and to a pronounced zero-bias Kondo peak in the differential conductance.

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Section: Multi-level Quantum Dots Based On Single-wall Carbon Nanotubesmentioning

confidence: 99%

Section: Spin Polarized Transport Through Single-level Quantum Dots Cmentioning

confidence: 99%

Spin effects in single-electron tunnelling

Barnaś¹,

Weymann²

2008

J. Phys.: Condens. Matter

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“…The effects of non-symmetric coupling have also been discussed in Refs. [16,17,18,19,20]. Here we present a more systematic study on the role of the asymmetry in the couplings to the leads in thermoelectric and transport properties of quantum dot system.…”

Section: Introductionmentioning

confidence: 99%

Thermoelectric phenomena in a quantum dot asymmetrically coupled to external leads

Krawiec

Wysokiński

2007

Phys. Rev. B

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We study thermoelectric phenomena in a system consisting of strongly correlated quantum dot coupled to external leads in the Kondo regime. We calculate linear and nonlinear electrical and thermal conductance and thermopower of the quantum dot and discuss the role of asymmetry in the couplings to external electrodes. In the linear regime electrical and thermal conductances are modified, while thermopower remains unchanged. In the nonlinear regime the Kondo resonance in differential conductance develops at non-zero source-drain voltage, which has important consequences on thermoelectric properties of the system and the thermopower starts to depend on the asymmetry. We also discuss Wiedemann-Franz relation, thermoelectric figure of merit and validity of the Mott formula for thermopower.

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“…24 In the condensed-matter literature on scanning microscopy, there is a profusion of work discussing spin-dependent phenomena employing ferromagnetic leads coupled to quantum dots or adatoms in the Kondo regime. 4,6,7,[25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42][43][44] Here, we mention those with metallic samples and buried impurities in which the anisotropy of the Fermi surface plays an important role in electron tunneling. [45][46][47][48][49][50] According to the experiment of Prüser et al, 45 such anisotropy allows atoms of Fe and Co beneath the Cu(100) surface to scatter electrons in preferential directions of the material due to an effect called "electron focusing."…”

Section: Introductionmentioning

confidence: 99%

Dimensionality effects in the local density of states of ferromagnetic hosts probed via STM: Spin-polarized quantum beats and spin filtering

Seridonio¹,

Leandro²,

Guessi³

et al. 2013

Phys. Rev. B

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We theoretically investigate the local density of states (LDOS) probed by an STM tip of ferromagnetic metals hosting a single adatom and a subsurface impurity. We model the system via the two-impurity Anderson Hamiltonian. By using the equation of motion with the relevant Green's functions, we derive analytical expressions for the LDOS of two host types: a surface and a quantum wire. The LDOS reveals Friedel-like oscillations and Fano interference as a function of the STM tip position. These oscillations strongly depend on the host dimension. Interestingly, we find that the spin-dependent Fermi wave numbers of the hosts give rise to spin-polarized quantum beats in the LDOS. Although the LDOS for the metallic surface shows a damped beating pattern, it exhibits the opposite behavior in the quantum wire. Due to this absence of damping, the wire operates as a spatially resolved spin filter with a high efficiency.

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Kondo effect in quantum dots coupled to ferromagnetic leads with noncollinear magnetizations

Cited by 70 publications

References 28 publications

Spin effects in single-electron tunnelling

Spin effects in single-electron tunnelling

Thermoelectric phenomena in a quantum dot asymmetrically coupled to external leads

Dimensionality effects in the local density of states of ferromagnetic hosts probed via STM: Spin-polarized quantum beats and spin filtering

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