Electron–phonon coupling in engineered magnetic molecules

Iancu, Violeta; Schouteden, Koen; Li, Zhe; Haesendonck, Chris Van

doi:10.1039/c6cc03847f

Cited by 15 publications

(18 citation statements)

References 40 publications

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“…In this framework, the Kondo effect 1,10,11 is the most frequently found. Since this phenomenon is an archetypal example of the formation of a many-body quantum state, it is central in the understanding of the electronic behavior of complex strongly correlated electrons systems such as heavy fermions 11,12 , Kondo insulators 13 , and nanoscale systems 2,3,5,[14][15][16][17][18][19][20][21][22][23][24][25][26][27] .…”

Section: Introductionmentioning

confidence: 99%

Quantifying the leading role of the surface state in the Kondo effect of Co/Ag(111)

et al. 2018

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Using a combination of scanning tunneling spectroscopy and atomic lateral manipulation, we obtained a systematic variation of the Kondo temperature (TK) of Co atoms on Ag(111) as a function of the surface state contribution to the total density of states at the atom adsorption site (ρs). By sampling the TK of a Co atom on positions where ρs was spatially resolved beforehand, we obtain a nearly linear relationship between both magnitudes. We interpret the data on the basis of an Anderson model including orbital and spin degrees of freedom (SU(4)) in good agreement with the experimental findings. The fact that the onset of the surface band is near the Fermi level is crucial to lead to the observed linear behavior. In the light of this model, the quantitative analysis of the experimental data evidences that at least a quarter of the coupling of Co impurities with extended states takes place through the hybridization to surface states. This result is of fundamental relevance in the understanding of Kondo screening of magnetic impurities on noble metal surfaces, where bulk and surface electronic states coexist.

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Section: Introductionmentioning

confidence: 99%

Quantifying the leading role of the surface state in the Kondo effect of Co/Ag(111)

et al. 2018

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“…Although T-shaped quantum dot systems discussed by us are only toy models, with the help of which we analyze the richness of emerging phenomena resulting from the interplay of three important factors, namely strong correlations, interference, and coupling with phonons, and discuss their impact on transport on a nanoscopic scale, the obtained results can be also qualitatively related to some experimental observations. Apart from many reports mentioned in the Introduction section, which demonstrate phonon-induced symmetric Kondo satellites, STM experiments presenting asymmetric satellite lines indicate the role of interference [ 51 ]. From the line widths of the central peaks or widths of satellite resonances one can infer about the Kondo temperature.…”

Section: Discussionmentioning

confidence: 99%

“…It has been shown that morphology manipulation of semiconductor QDs such as size, shape, strain distribution, or inhomogenities can influence the coupling strength of electron-phonon (e-ph) interactions [49]. The phononic effects appears not only in sequential tunneling, but also in the Kondo regime where vibrational sidebands have been also observed [45,[50][51][52][53][54]. The interplay of electron-phonon coupling and Kondo effect has been also studied theoretically [55][56][57][58][59][60].…”

Section: Introductionmentioning

confidence: 99%

Impact of electron–phonon coupling on electron transport through T-shaped arrangements of quantum dots in the Kondo regime

Florków¹,

Lipiński²

2021

Beilstein J. Nanotechnol.

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We calculate the conductance through strongly correlated T-shaped molecular or quantum dot systems under the influence of phonons. The system is modelled by the extended Anderson–Holstein Hamiltonian. The finite-U mean-field slave boson approach is used to study many-body effects. Phonons influence both interference and correlations. Depending on the dot unperturbed energy and the strength of electron–phonon interaction, the system is occupied by a different number of electrons that effectively interact with each other repulsively or attractively. This leads, together with the interference effects, to different spin or charge Fano–Kondo effects.

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“…This phenomenon is well known in condensed matter 16 and leads to a peak in the conductance, at zero bias which appears at low temperatures. Signatures of the Kondo effect have been observed in semiconducting 17,18 as well as in molecular [19][20][21][22][23][24][25][26] quantum dots. The conductance at zero bias reaches a maximum near the quantum of conductance G 0 , which in non-interacting systems can only be obtained by tuning the energy of one level near the Fermi energy.…”

Section: Introductionmentioning

confidence: 99%

Destructive quantum interference in transport through molecules with electron–electron and electron-vibration interactions

Roura‐Bas

Güller

Tosi

et al. 2019

J. Phys.: Condens. Matter

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We study the transport through a molecular junction exhibiting interference effects. We show that these effects can still be observed in the presence of molecular vibrations if Coulomb repulsion is taken into account. In the Kondo regime, the conductance of the junction can be changed by several orders of magnitude by tuning the levels of the molecule, or displacing a contact between two atoms, from nearly perfect destructive interference to values of the order of 2e 2 /h expected in Kondo systems. We also show that this large conductance change is robust for reasonable temperatures and voltages for symmetric and asymmetric tunnel couplings between the source-drain electrodes and the molecular orbitals. This is relevant for the development of quantum interference effect transistors based on molecular junctions.

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Electron–phonon coupling in engineered magnetic molecules

Cited by 15 publications

References 40 publications

Quantifying the leading role of the surface state in the Kondo effect of Co/Ag(111)

Quantifying the leading role of the surface state in the Kondo effect of Co/Ag(111)

Impact of electron–phonon coupling on electron transport through T-shaped arrangements of quantum dots in the Kondo regime

Destructive quantum interference in transport through molecules with electron–electron and electron-vibration interactions

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