CUED Publications database

Spatial mapping and statistical reproducibility of an array of 256 one-dimensional quantum wires

Al-Taie, H and Smith, LW and Lesage, AAJ and See, P and Griffiths, JP and Beere, HE and Jones, GAC and Ritchie, DA and Kelly, MJ and Smith, CG (2015) Spatial mapping and statistical reproducibility of an array of 256 one-dimensional quantum wires. Journal of Applied Physics, 118. ISSN 0021-8979

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Abstract

© 2015 Author(s). We utilize a multiplexing architecture to measure the conductance properties of an array of 256 split gates. We investigate the reproducibility of the pinch off and one-dimensional definition voltage as a function of spatial location on two different cooldowns, and after illuminating the device. The reproducibility of both these properties on the two cooldowns is high, the result of the density of the two-dimensional electron gas returning to a similar state after thermal cycling. The spatial variation of the pinch-off voltage reduces after illumination; however, the variation of the one-dimensional definition voltage increases due to an anomalous feature in the center of the array. A technique which quantifies the homogeneity of split-gate properties across the array is developed which captures the experimentally observed trends. In addition, the one-dimensional definition voltage is used to probe the density of the wafer at each split gate in the array on a micron scale using a capacitive model.

Item Type: Article
Subjects: UNSPECIFIED
Divisions: Div B > Solid State Electronics and Nanoscale Science
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 19:09
Last Modified: 23 Nov 2017 03:36
DOI: