Nonequilibrium theory of scanning tunneling spectroscopy via adsorbate resonances: Nonmagnetic and Kondo impurities

Plihal, M.; Gadzuk, J. W.

doi:10.1103/physrevb.63.085404

Cited by 168 publications

(203 citation statements)

References 61 publications

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“…Indeed, crystal wavefunctions with k || = 0 have the largest amplitude outside the surface representing electrons which have the largest probability of being detected by the tip (see Ref. [10] for discussion). Hence, the oscillatory behavior appearing in Eq.…”

Section: Dependence Of Conductance Lineshapes With Tip Positionmentioning

confidence: 99%

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Simple model for scanning tunneling spectroscopy of noble metal surfaces with adsorbed Kondo impurities

Merino

Gunnarsson

2004

Phys. Rev. B

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A simple model is introduced to describe conductance measurements between a scanning tunneling microscope (STM) tip and a noble metal surface with adsorbed transition metal atoms which display the Kondo effect. The model assumes a realistic parameterization of the potential created by the surface and a d 3z 2 −r 2 orbital for the description of the adsorbate. Fano lineshapes associated with the Kondo resonance are found to be sensitive to details of the adsorbate-substrate interaction. For instance, bringing the adsorbate closer to the surface leads to more asymmetric lineshapes while their dependence on the tip distance is weak. We find that it is important to use a realistic surface potential, to properly include the tunnelling matrix elements to the tip and to use substrate states which are orthogonal to the adsorbate and tip states. An application of our model to Co adsorbed on Cu explains the difference in the lineshapes observed between Cu(100) and Cu(111) surfaces.

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Section: Dependence Of Conductance Lineshapes With Tip Positionmentioning

confidence: 99%

“…Due to the slow decay of the tip wave function, most of the contribution to Mk comes from the region close to the metal surface for k z not too large. Matrix elements Mk(R) can then be approximately factorized as 10 :…”

Section: Computation Of Matrix Elementsmentioning

confidence: 99%

Simple model for scanning tunneling spectroscopy of noble metal surfaces with adsorbed Kondo impurities

Merino

Gunnarsson

2004

Phys. Rev. B

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“…͑2.7͒-͑2.10͒ of Ref. 24: for each conduction-electron wave function ⌿ k ͑r͒, we rewrite the hopping matrix elements to the impurity and to the tip according to…”

Section: Model For Tunneling Into Impurity Resonancesmentioning

confidence: 99%

Theory of Fano resonances in graphene: The influence of orbital and structural symmetries on STM spectra

et al. 2010

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We theoretically investigate Fano factors arising in local spectroscopy of impurity resonances in graphene. It is demonstrated that Fano line shapes can strongly differ from the antiresonances usually found on metal surfaces. Graphene's highly symmetric Fermi points make this effect particularly sensitive to the detailed atomistic structure and orbital symmetries of the impurity. After a model discussion based on an Anderson impurity coupled to an electron bath with linearly vanishing density of states, we present first-principles calculations of Co adatoms on graphene. For Co above the center of a graphene hexagon, we find that the two-dimensional E 1 representation made of d xz , d yz orbitals is likely responsible for the hybridization and ultimately Kondo screening for cobalt on graphene. Anomalously large Fano q factors depending strongly on the orbitals involved are obtained. For a resonant s-wave impurity, a similarly strong adsorption site dependence of the q factor is demonstrated. These anomalies are striking examples of quantum-mechanical interference related to the Berry phase inherent to the graphene band structure.

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“…in single-electron transistors, the Fano resonances in the conductance were observed [12], which imply that there are two paths for transfer of electrons between a source and a drain. Especially the recent experimental and theoretical study with a low-temperature scanning tunneling microscope (STM) of the single magnetic atom deposited on a metallic surface showed the asymmetric Fano resonances in the tunneling spectra [12][13][14][15]. The STM measurements indicate that in tunneling of electrons between STM tip and a surface with a single impurity atom two different paths are present.…”

Section: Introductionmentioning

confidence: 99%

Influence of microwave fields on electron transport through a quantum dot in the presence of direct tunneling between leads

2004

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We consider the time-dependent electron transport through a quantum dot coupled to two leads in the presence of the additional over-dot (bridge) tunneling channel. By using the evolution operator method together with the wide-band limit approximation we derived the analytical formulaes for the quantum dot charge and current flowing in the system. The influence of the external microwave field on the time-average quantum dot charge, the current and the derivatives of the average current with respect to the gate and source-drain voltages has been investigated for a wide range of parameters.

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Nonequilibrium theory of scanning tunneling spectroscopy via adsorbate resonances: Nonmagnetic and Kondo impurities

Cited by 168 publications

References 61 publications

Simple model for scanning tunneling spectroscopy of noble metal surfaces with adsorbed Kondo impurities

Simple model for scanning tunneling spectroscopy of noble metal surfaces with adsorbed Kondo impurities

Theory of Fano resonances in graphene: The influence of orbital and structural symmetries on STM spectra

Influence of microwave fields on electron transport through a quantum dot in the presence of direct tunneling between leads

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