Conductivity of Si(111)-(<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mn>7</mml:mn><mml:mo>×</mml:mo><mml:mn>7</mml:mn></mml:mrow></mml:math>): The Role of a Single Atomic Step

Martins, Bruno V. C.; Smeu, Manuel; Livadaru, Lucian; Guo, Hong; Wolkow, Robert A.

doi:10.1103/physrevlett.112.246802

Cited by 31 publications

(42 citation statements)

References 39 publications

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“…12,23 Up to now, there are no STP transport studies on this surface reported in the literature. For the measurements, we have used the same n-Si(111) 700 Ωcm substrates as above.…”

Section: B Si(111) − (7 × 7)mentioning

confidence: 99%

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Scanning tunneling potentiometry implemented into a multi-tip setup by software

Lüpke

Korte

Cherepanov

et al. 2015

Review of Scientific Instruments

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We present a multi-tip scanning tunneling potentiometry technique that can be implemented into existing multi-tip scanning tunneling microscopes without installation of additional hardware. The resulting setup allows flexible in situ contacting of samples under UHV conditions and subsequent measurement of the sample topography and local electric potential with resolution down to Å and μV, respectively. The performance of the potentiometry feedback is demonstrated by thermovoltage measurements on the Ag/Si(111)−(3×3)R30∘ surface by resolving a standing wave pattern. Subsequently, the ability to map the local transport field as a result of a lateral current through the sample surface is shown on Ag/Si(111)−(3×3)R30∘ and Si(111) − (7 × 7) surfaces.

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“…12,23 Up to now, there are no STP transport studies on this surface reported in the literature. For the measurements, we have used the same n-Si(111) 700 Ωcm substrates as above.…”

Section: B Si(111) − (7 × 7)mentioning

confidence: 99%

“…These results are in agreement with previously reported results. 12,23 For this surface, the steps contribute 82% of the measured surface resistance, while the terraces contribute 18%.…”

Section: B Si(111) − (7 × 7)mentioning

confidence: 99%

Scanning tunneling potentiometry implemented into a multi-tip setup by software

Lüpke

Korte

Cherepanov

et al. 2015

Review of Scientific Instruments

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show abstract

“…The motivation comes from microelectronics [3] as well as from molecular electronics projects, and the results depend mainly on the system under investigation. The underlying physics may be determined mostly by surface states [4,5], by some bulk features or a mixture of these two limiting cases [6,7]. In the first case, quantum transport theory may be applied to understand the results, e.g.…”

Section: Introductionmentioning

confidence: 99%

Appearance of effective surface conductivity: An experimental and analytic study

et al. 2015

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Surface conductance measurements on p-type doped germanium show a small but systematic change to the surface conductivity at different length scales. This effect is independent of the structure of the surface states. We interpret this phenomenon as a manifestation of conductivity changes beneath the surface. This hypothesis is confirmed by an analysis of the classical current flow equation. We derive an integral formula for calculating of the effective surface conductivity as a function of the distance from a point source. Furthermore we derive asymptotic values of the surface conductivity at small and large distances. The actual surface conductivity can only be sampled close to the current source. At large distances, the conductivity measured on the surface corresponds to the bulk value.

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“…Using microscopic techniques, the step resistivity was estimated through the observation of standing waves by STM [35], but the method is applicable only to ballistic systems. Scanning tunneling potentiometry [38,39] has been the only microscopic method applicable to diffusive systems. Since the method detects potential profiles under macroscopic current flow, an ambiguous estimate of the current density may cause uncertainty in the conductance measurements.…”

mentioning

confidence: 99%