Relation between width of zero-bias anomaly and Kondo temperature in transport measurements through correlated quantum dots: Effect of asymmetric coupling to the leads

Daroca, D. Pérez; Roura‐Bas, P.; Aligia, A. A.

doi:10.1103/physrevb.98.245406

Cited by 19 publications

(19 citation statements)

References 101 publications

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“…This task has been already done in Ref. 87 fitting a popular phenomenological expression for G(T /T K ). The renormalized parameters for RPT were taken from previous calculations.…”

Section: The Limit U → ∞mentioning

confidence: 99%

Heat current across a capacitively coupled double quantum dot

Aligia¹,

Daroca²,

Arrachea³

et al. 2020

Phys. Rev. B

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We study the heat current through two capacitively coupled quantum dots coupled in series with two conducting leads in the spinless case (valid for a high applied magnetic field). Our results are also valid for the heat current through a single quantum dot with strongly ferromagnetic leads pointing in opposite directions (so that the electrons with given spin at the dot can jump only to one lead) or through a quantum dot with two degenerate levels with destructive quantum interference and high magnetic field. Although the charge current is always zero, the heat current is finite when the interdot Coulomb repulsion is taken into account due to many-body effects. We generalize previous results for high temperatures and particular parameters obtained by Yadalam and Harbola [Phys. Rev. B 99, 195449 (2019)]. In particular we consider temperatures for which an orbital Kondo regime takes place. In contrast to previous results, we find that the heat current is finite even for U → ∞. In the Kondo regime, for temperatures much less than the Kondo energy scale, we obtain that the dependence of the thermal current with the temperature difference ∆T is ∼ (∆T ) 4 when the cold lead is at TC ≪ ∆T , and linear in ∆T if TC ≫ ∆T . For large TC the current saturates. As a function of Coulomb strength U , for high ∆T and TC = 0, the charge current has a maximum for U ∼ 3∆T and decreases with increasing U reaching a finite value for U → ∞. We also consider the case of different energy levels of the dots for which the device has rectifying properties.

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“…This task has been already done in Ref. 87 fitting a popular phenomenological expression for G(T /T K ). The renormalized parameters for RPT were taken from previous calculations.…”

Section: The Limit U → ∞mentioning

confidence: 99%

Heat current across a capacitively coupled double quantum dot

Aligia¹,

Daroca²,

Arrachea³

et al. 2020

Phys. Rev. B

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“…As T → 0, γ imp (T ) converges to the Kondo temperature and ρ imp (0) converges to 1 πΓ (in the wide band limit) [1,41,42]. At βΓ = 50, γ imp is not fully converged to the zero temperature value and therefore overestimates T K .…”

Section: Methodsmentioning

confidence: 99%

“…Since T K defines a crossover scale rather than a sharp transition, its exact value is ambiguous. For example, in [42], the authors find that within the noncrossing approximation (NCA) the T K estimated from the impurity spectrum is approximately half the T K estimated from the conductance.…”

Section: Methodsmentioning

confidence: 99%

The Kondo Cloud in a 1D Nanowire

Kleinhenz¹,

Krivenko²,

Cohen³

et al. 2021

Preprint

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A recent experiment [Nature 579, 210-213 (2020)] probed the extent of the Kondo cloud in 1D by measuring the effect of electrostatic perturbations applied a distance L away from the impurity on TK . We study the Kondo cloud in a model proposed to describe this experimental setup, consisting of a single impurity Anderson model coupled to two semi-infinite 1D leads. In agreement with the experimental results, we find that TK is strongly affected by perturbations to the lead within the Kondo cloud. We obtain a complementary picture of the Kondo cloud in this system by observing how the Kondo state manifests itself in the local density of states of the leads, which may be observed experimentally via scanning tunneling microscopy. Our results support the existing experimental data and provide detailed predictions for future experiments seeking to characterize the Kondo cloud in this system.

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“…It would be interesting to push the STM tip against the molecule and tune from the tunneling to the contact regime. In this case the factor f is expected to increase beyond 1 [67][68][69], driving the system through the topological quantum phase transition to the ordinary Fermi liquid regime. This would be signalled by the sudden transformation of the dip into a peak of similar amplitude, i.e., compared to the baseline density of states, the height of the peak just after the transition should be similar as the depth of the dip just before the transition.…”

Section: A Topological Quantum Phase Transition and Generalized Fried...mentioning

confidence: 99%

Iron phthalocyanine on Au(111) is a "non-Landau" Fermi liquid

Žitko,

Blesio,

Manuel

et al. 2021

Preprint

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Relation between width of zero-bias anomaly and Kondo temperature in transport measurements through correlated quantum dots: Effect of asymmetric coupling to the leads

Cited by 19 publications

References 101 publications

Heat current across a capacitively coupled double quantum dot

Heat current across a capacitively coupled double quantum dot

The Kondo Cloud in a 1D Nanowire

Iron phthalocyanine on Au(111) is a "non-Landau" Fermi liquid

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