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

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