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

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

2008-02-21

arxiv.org/abs/0802.3236v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

10.1103/PhysRevB.77.245327

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.

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