Imaging a 1-electron InAs quantum dot in an InAs/InP nanowire

Abstract

Nanowire heterostructures define high-quality few-electron quantum dots for nanoelectronics, spintronics and quantum information processing. We use a cooled scanning probe microscope (SPM) to image and control an InAs quantum dot in an InAs/InP nanowire, using the tip as a movable gate. Images of dot conductance vs. tip position at T = 4.2 K show concentric rings as electrons are added, starting with the first electron. The SPM can locate a dot along a nanowire and individually tune its charge, abilities that will be very useful for the control of coupled nanowire dots.

References in corpus (5)

• Coherent Single Charge Transport in Molecular-Scale Silicon Nanowire Transistors
• Subsurface charge accumulation imaging of a quantum Hall liquid
• Tunable effective g-factor in InAs nanowire quantum dots
• Spatially resolved manipulation of single electrons in quantum dots using a scanned probe
• Imaging a Single-Electron Quantum Dot

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