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

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.
Authors:
;  [1] ;  [2] ; ; ; ; ; ; ;  [3] ;  [4]
  1. Centre for Advanced Photonics and Electronics, Electrical Engineering Division, Department of Engineering, 9 J. J. Thomson Avenue, University of Cambridge, Cambridge CB3 0FA (United Kingdom)
  2. (United Kingdom)
  3. Cavendish Laboratory, Department of Physics, University of Cambridge, J. J. Thomson Avenue, Cambridge CB3 0HE (United Kingdom)
  4. National Physical Laboratory, Hampton Road, Teddington, Middlesex TW11 0LW (United Kingdom)
Publication Date:
OSTI Identifier:
22494775
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 118; Journal Issue: 7; Other Information: (c) 2015 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; DENSITY; ELECTRIC CONDUCTIVITY; ELECTRIC POTENTIAL; ELECTRON GAS; ILLUMINANCE; ONE-DIMENSIONAL CALCULATIONS; QUANTUM WIRES; SPACE DEPENDENCE; THERMAL CYCLING; TWO-DIMENSIONAL SYSTEMS