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Pohjola, Teemu; Boese, Daniel; König, Jürgen; Schoeller, Herbert; Schön, Gerd

doi:10.1023/a:1004646101809

Cited by 7 publications

(5 citation statements)

References 9 publications

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“…Furthermore, we find that the splitting of the Kondo resonance can be observed also at temperatures above the Kondo temperature, and that the same qualitative fea-tures are obtained when the coupling to the third lead is no longer weak. Contrary to a previous proposal to probe the splitting of the Kondo resonance using two capacitively coupled quantum dots [8], our approach allows for a direct measurement of the nonequilibrium DOS. Figure 1 shows the proposed experimental setting.…”

mentioning

confidence: 95%

Measuring the out-of-equilibrium splitting of the Kondo resonance

Lebanon¹,

Schiller²

2001

Phys. Rev. B

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An experiment is proposed to measure the out-of-equilibrium splitting of the Kondo resonance in an ultrasmall quantum dot, by adding a third, weakly coupled lead to the standard two-lead quantumdot system, and sweeping the chemical potential of that lead. Fixing the voltage bias between the source and drain leads, we show that the differential conductance for the current through the third lead traces the out-of-equilibrium dot density of states (DOS) for the two-lead system. This enables one to measure the dot DOS in the presence of an applied voltage bias. We show that this method is robust, and extends also to the case where the coupling to the third lead is no longer weak.

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mentioning

confidence: 95%

Measuring the out-of-equilibrium splitting of the Kondo resonance

Lebanon¹,

Schiller²

2001

Phys. Rev. B

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“…42,43,46 Note that this result also applies to other geometries like double-layer QDs. 16,17,18,19 The detection of an interference-induced orbital Kondo effect is more difficult than for the usual spin Kondo effect. Nevertheless it is possible by probing the resonance by additional leads to the dot.…”

Section: B Splitting the Kondo Peakmentioning

confidence: 99%

“…In other words, the state of complete destructive interference is a strong coupling state. Such models have been studied for instance for multilevel vertical quantum dots, 37 where the orbital momentum is conserved in tunneling, or in double-layer QD system, 16,17,18,19 where the index i corresponds to the upper or lower plane. In such cases the Kondo temperature is enhanced with respect to a pure spin Kondo model, as the second quantum number -the pseudospin -can give rise to Kondo correlations alone.…”

Section: A Interference-induced Orbital Kondo Effectmentioning

confidence: 99%

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Interference in interacting quantum dots with spin

2002

Self Cite

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We study spectral and transport properties of interacting quantum dots with spin. Two particular model systems are investigated: Lateral multilevel and two parallel quantum dots. In both cases different paths through the system can give rise to interference. We demonstrate that this strengthens the multilevel Kondo effect for which a simple two-stage mechanism is proposed. In parallel dots we show under which conditions the peak of an interference-induced orbital Kondo effect can be split.

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“…[ 19–21 ] In the DQDs system, more degenerate cases can be realized by different occupancies. When two electrons originally staying in the same dot are degenerated with each staying in a separate dot, the orbital Kondo effect [ 22–24 ] can emerge. When it accommodates one electron at each dot, it can form either a

S=0

singlet or an

S=1

triplet.…”

Section: Introductionmentioning

confidence: 99%

Magnetic Field Dependent Kondo Transport through Double Quantum Dots System

Cheng

Zheng

et al. 2022

Annalen der Physik

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The Kondo transport associated with the magnetic field in parallel-coupled double quantum dots (PDQDs) is theoretically investigated using the hierarchical-equation-of-motion approach (HEOM). In this system, the interdot tunneling induces an effective antiferromagnetic interaction; thus, its ground state is an orbital singlet associated with approximately zero differential conductance. When an appropriate large magnetic field is applied, the two spins of the two dots have a possibility with a parallel arrangement, and thus the singlet and one of the triplets are degenerated. At the degenerate point, a distinct zero-energy resonance peak appears, associated with significant differential conductance. The Kondo scale behavior at the degenerate point and the total and spin resolved spectral functions around the degenerate point are examined. The results confirm the spin-1∕2 Kondo resonance near the singlet-triplet transition point. The differential conductance phase diagram, as well as thermoelectric transport, is also quantitatively presented.

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Cited by 7 publications

References 9 publications

Measuring the out-of-equilibrium splitting of the Kondo resonance

Measuring the out-of-equilibrium splitting of the Kondo resonance

Interference in interacting quantum dots with spin

Magnetic Field Dependent Kondo Transport through Double Quantum Dots System

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