Dicke-like effect in spin-polarized transport through coupled quantum dots

Trocha, Piotr; Barnaś, J.

doi:10.1088/0953-8984/20/12/125220

Cited by 32 publications

(24 citation statements)

References 39 publications

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“…Interference conditions can be changed by magnetic field (Aharonov -Bohm oscillations [15,16]) or modification of geometry. The example of the latter are Fano or Dicke resonances [17][18][19][20][21][22] present when background and resonance scattering processes occur simultaneously. The simplest system to study the interplay between interference and many-body correlations are coupled parallel quantum dots (PDQD) [23].…”

Section: Introductionmentioning

confidence: 99%

Spin-orbital and spin Kondo effects in parallel coupled quantum dots

Krychowski

Lipiński

2016

Phys. Rev. B

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Strong electron correlations and interference effects are discussed in parallel-coupled single-level and orbitally doubly degenerate quantum dots. The finite-U mean-field slave boson approach is used to study many-body effects. The analysis is carried out in a wide range of parameter space including both atomic-like and molecular-like Kondo regimes and taking into account various perturbations, like interdot tunneling, interdot interaction, mixing of the electrode channels and exchange interaction. We also discuss the influence of singularities of electronic structure and the impact of polarization of electrodes. Special attention is paid to potential spintronic applications of these systems showing how current polarization can be controlled by adjusting interference conditions and correlations by gate voltage. Simple proposals of double dot spin valve and bipolar electrically tunable spin filter are presented.

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Section: Introductionmentioning

confidence: 99%

Spin-orbital and spin Kondo effects in parallel coupled quantum dots

Krychowski

Lipiński

2016

Phys. Rev. B

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“…In particular, triple dots enable the investigation of spin-entangled currents [32], dark states [37,41], or various interference effects [34,39]. Although nonmagnetic properties of multi-dot structures have already been addressed both theoretically and experimentally, very little is known about their magnetic transport properties [51]. The goal of this paper is therefore to discuss the spin-polarized transport through coherent triple quantum dots.…”

Section: Introductionmentioning

confidence: 99%

The tunnel magnetoresistance in chains of quantum dots weakly coupled to external leads

Weymann

2009

J. Phys.: Condens. Matter

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Abstract. We analyze numerically the spin-dependent transport through coherent chains of three coupled quantum dots weakly connected to external magnetic leads. In particular, using the diagrammatic technique on the Keldysh contour, we calculate the conductance, shot noise and tunnel magnetoresistance (TMR) in the sequential and cotunneling regimes. We show that transport characteristics greatly depend on the strength of the interdot Coulomb correlations, which determines the spacial distribution of electron wave function in the chain. When the correlations are relatively strong, depending on the transport regime, we find both negative TMR as well as TMR enhanced above the Julliere value, accompanied with negative differential conductance (NDC) and super-Poissonian shot noise. This nontrivial behavior of tunnel magnetoresistance is associated with selection rules that govern tunneling processes and various high-spin states of the chain that are relevant for transport. For weak interdot correlations, on the other hand, the TMR is always positive and not larger than the Julliere TMR, although super-Poissonian shot noise and NDC can still be observed.

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“…Such an effect has been also predicted and observed in a system of two quantum dots embedded in two arms of the Aharonov-Bohm ring [20][21][22][23][24]. In turn, the Dicke effect comes then from the indirect coupling of QDs via the leads [25][26][27][28][29][30][31].…”

Section: Introductionmentioning

confidence: 74%