Scanned gate microscopy of a one-dimensional quantum dot

Abstract

We analyze electrostatic interaction between a sharp conducting tip and a thin one-dimensional wire, e.g., a carbon nanotube, in a scanned gate microscopy (SGM) experiment. The problem is analytically tractable if the wire resides on a thin dielectric substrate above a metallic backgate. The characteristic spatial scale of the electrostatic coupling to the tip is equal to its height above the substrate. Numerical simulations indicate that imaging of individual electrons by SGM is possible once the mean electron separation exceeds this scale (typically, a few tens of nm). Differences between weakly and strongly invasive SGM regimes are pointed out.

9 pages, 5 figures. To appear in NanoLetters

References in corpus (1)

• High frequency Scanning Gate Microscopy and local memory effect of carbon nanotube transistors

Cited by in corpus (6)

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• Probing Wigner correlations in a suspended carbon nanotube
• Conductance microscopy of quantum dots weakly or strongly coupled to the conducting channel
• Multitip scanning gate microscopy for ballistic transport studies in systems with two-dimensional electron gas