Local charge injection in STM as a mechanism for imaging with anomalously high corrugation

Drakova, D.; Doyen, G.

doi:10.1103/physrevb.56.r15577

Cited by 12 publications

(14 citation statements)

References 15 publications

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“…[8]. The dynamic relaxation of the local ion resonances provided the explanation of the ''anomalously'' high corrugation amplitude in the constant current scanning mode in STM on flat sp-metals like the fcc (1 1 1) surface of aluminium [5].…”

Section: The Theory and The Modelmentioning

confidence: 99%

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Theory of long-range forces in AFM and current versus distance curves in STM on Au(111)

Drakova

Doyen

2004

Surface Science

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Section: The Theory and The Modelmentioning

confidence: 99%

“…These states, called adsorbate projected metal states, are the ones representing the metal surfaces in the local region. The formal aspects of the theory have been described in our earlier publications [5][6][7].…”

Section: The Theory and The Modelmentioning

confidence: 99%

Theory of long-range forces in AFM and current versus distance curves in STM on Au(111)

Drakova

Doyen

2004

Surface Science

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“…More recently, a many-body theory including the dynamic response in the metal and affinity resonances in the surface was introduced in order to explain the large corrugation of STM images on Al͑111͒. 15 Recently, Ness and Fisher proposed a local-density-functional-based projector augmented wave method, 16 where the asymptotic scattering states are replaced by localized initial and final states on either sides of the tunnel junction. The calculation of the electron-transfer rate is then performed within a nonperturbative Green's-function method.…”

Section: Introductionmentioning

confidence: 99%

Ab initiocalculations of scanning tunneling microscopy images within a scattering formalism

1999

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A procedure for the simulation of scanning tunneling microscopy ͑STM͒ images is presented. It combines a density-functional theory ͑DFT͒ determination of the electronic wave functions and a scattering formalism for the tunneling current calculation. The atomic structures of the sample and the tip are fully described. The coupling of the surface and the tip apex with their respective bulk reservoirs together with the tip-surface interactions are completely taken into account. The whole system being infinite, the DFT calculations were performed on fragments of the system. From the calculated Hamiltonian and overlap matrix elements, the tunnel current was evaluated with a Green's-function technique. We applied this method both to the Cu͑001͒ surface probed by a Cu tip ͑contaminated or not͒ and to a Cu(001)ϩp(2ϫ2)-S surface probed by a Cu tip. The calculated current as a function of the tip-surface distance, with a decay of one decade per Å, and the corrugations in the zero-bias limit are in good agreement with experimental data. The analysis of the atomic orbital contributions to the tunnel current can provide insights into the STM contrast mechanism, as shown with selected examples. ͓S0163-1829͑99͒02927-6͔

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“…We emphasize that the existence of the long range attractive force in AFM on Au(111), which is due to the image interaction of the localized trapped electron in front of the surface, is connected with the tunnelling via image states in STM, as it was demonstrated recently [5]. Within the same theory a lot of seemingly unrelated phenomena, observed experimentally in STM, STS and AFM on metal surfaces, could be elucidated, among which the "anomalously" large corrugation amplitudes in STM [9], "mirage features" in the topographic mode of STM and in scanning tunnelling spectra [10], tip-dependent imaging of adsorbates.…”

Section: Force On Au(111): Results and Discussionmentioning

confidence: 91%

QND theory of long range forces in AFM on Au(111)

Drakova

Doyen

2005

Physica Status Solidi (b)

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The nature of the long range forces in atomic force microscopy (AFM) between a tungsten tip and the Au(111) surface is studied within Quantum Nano Dynamics (QND), treating many‐particle interactions and long range screening effects. A new mechanism of long range forces between a neutral tip and a metal surface is suggested due to the interaction with the image potential in the tip and the sample of a single electron localized on the Au(111) surface in front of the tip, in the presence of the AFM tip, and the image screening it provides. Force between a W‐tip and Au(111) – measured in AFM (circles and crosses, left‐hand axis, Ref. [1]) and calcu‐lated within QND theory (full curve, right‐hand axis). (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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Local charge injection in STM as a mechanism for imaging with anomalously high corrugation

Cited by 12 publications

References 15 publications

Theory of long-range forces in AFM and current versus distance curves in STM on Au(111)

Theory of long-range forces in AFM and current versus distance curves in STM on Au(111)

Ab initiocalculations of scanning tunneling microscopy images within a scattering formalism

QND theory of long range forces in AFM on Au(111)

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