Impact of capacitance and tunneling asymmetries on Coulomb blockade edges and Kondo peaks in nonequilibrium transport through molecular quantum dots

Aligia, A. A.; Roura‐Bas, P.; Florens, Serge

doi:10.1103/physrevb.92.035404

Cited by 21 publications

(33 citation statements)

References 43 publications

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“…The peak of larger spectral weight near ω = E d is the charge-transfer peak. Since for ω ∼ E d , there is no surface density of states, the total width at half maximum expected for this peak is ∼ 4∆ b = 2, 65 in agreement with what we obtain. This peak is almost unchanged as D s crosses the Fermi energy […”

Section: Spectral Density Within the Ncasupporting

confidence: 91%

“…1, 54 In contrast to NRG in which finite-energy features are artificially broadened due to the logarithmic discretization of the conducting band 63,64 , NCA correctly describes these features. For instance, the intensity and the width of the charge-transfer peak of the spectral density (the one near the dot level E d ) was found 65 in agreement with other theoretical methods 66,67 and experiment 68 . Furthermore, it has a natural extension to non-equilibrium conditions 69 and it is specially suitable for describing satellite peaks of the Kondo resonance, as those observed in Ce systems, 70,71 or away from zero bias voltage in nonequilibrium transport.…”

Section: Introductionsupporting

confidence: 86%

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Kondo temperature when the Fermi level is near a step in the conduction density of states

et al. 2017

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The (111) surface of Cu, Ag and Au is characterized by a band of surface Shockley states, with constant density of states beginning slightly below the Fermi energy. These states as well as bulk states hybridize with magnetic impurities which can be placed above the surface. We calculate the characteristic low-temperature energy scale, the Kondo temperature TK of the impurity Anderson model, as the bottom of the conduction band Ds crosses the Fermi energy ǫF. We find simple power laws TK ≃ |Ds − ǫF | η , where η depends on the sign of Ds − ǫF , the ratio between surface and bulk hybridizations with the impurity ∆s/∆ b and the ratio between on-site and Coulomb energy E d /U in the model.

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Section: Spectral Density Within the Ncasupporting

confidence: 91%

Section: Introductionsupporting

confidence: 86%

Kondo temperature when the Fermi level is near a step in the conduction density of states

et al. 2017

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“…Furthermore, it has a natural extension to non-equilibrium conditions 63 and it is especially suitable for describing satellite peaks away from the zero bias voltage 26,28,64 . In addition, the NCA Haldane shift 65 (the renormalization of the bare α energy due to many body correlations) was found to be in agreement with the Haldane's prediction 58,59,64 . We remind the reader that the charge-transfer peaks as any other satellite peak in the spectral function are artificially broadened within NRG due to the logarithmic discretization of the conducting band 66 and hence the NCA solution, which is free of this shortcoming became a useful alternative treatment.…”

Section: B Non Crossing Approximationsupporting

confidence: 66%

Fully compensated Kondo effect for a two-channel spin S=1 impurity

et al. 2019

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We study the low-temperature properties of the generalized Anderson impurity model in which two localized configurations, one with two doublets and the other with a triplet, are mixed by two degenerate conduction channels. By using the numerical renormalization group and the noncrossing approximation, we analyze the impurity entropy, its spectral density, and the equilibrium conductance for several values of the model parameters. Marked differences with respect to the conventional one-channel spin s = 1/2 Anderson model, that can be traced as hallmarks of an impurity spin S = 1, are found in the Kondo temperature, the width and position of the charge transfer peak, and the temperature dependence of the equilibrium conductance. Furthermore, we analyze the rich effects of a single-ion magnetic anisotropy D on the Kondo behavior. In particular, as shown before, for large enough positive D the system behaves as a "non-Landau" Fermi liquid that cannot be adiabatically connected to a non-interacting system turning off the interactions. For negative D the Kondo effect is strongly suppressed. While the model is suitable for the description of a single Ni impurity embedded into an O doped Au chain, it is a generic one for S = 1 and two channels and might be realized in other nanoscopic systems.

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“…At sufficiently low temperature, the differential conductance G(V ,r t ) when the STM tip is at position r t on the surface is proportional to the density of the mixed state [23,24],…”

Section: B Differential Conductancementioning

confidence: 99%

Manipulation of the surface density of states of Ag(111) by means of resonators: Experiment and theory

et al. 2016

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We show that the density of surface Shockley states of Ag(111) probed by the differential conductance G(V ) = dI/dV by a scanning-tunneling microscope (STM) can be enhanced significantly at certain energies and positions introducing simple arrays of Co or Ag atoms on the surface, in contrast to other noble-metal surfaces. Specifically we have studied resonators consisting of two parallel walls of five atoms deposited on the clean Ag(111) surface. A simple model in which the effect of the adatoms is taken into account by an attractive local potential and a small hybridization between surface and bulk at the position of the adatoms explains the main features of the observed G(V ) and allows us to extract the proportion of surface and bulk states sensed by the STM tip. These results might be relevant to engineer the surface spectral density of states, to study the effects of surface states on the Kondo effect, and to separate bulk and surface contributions in STM studies of topological surface states.

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Impact of capacitance and tunneling asymmetries on Coulomb blockade edges and Kondo peaks in nonequilibrium transport through molecular quantum dots

Abstract: International audienc

Cited by 21 publications

References 43 publications

Kondo temperature when the Fermi level is near a step in the conduction density of states

Kondo temperature when the Fermi level is near a step in the conduction density of states

Fully compensated Kondo effect for a two-channel spin S=1 impurity

Manipulation of the surface density of states of Ag(111) by means of resonators: Experiment and theory

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