CUED Publications database

Cryogenic on-chip multiplexer for the study of quantum transport in 256 split-gate devices

Al-Taie, H and Smith, LW and Xu, B and See, P and Griffiths, JP and Beere, HE and Jones, GAC and Ritchie, DA and Kelly, MJ and Smith, CG (2013) Cryogenic on-chip multiplexer for the study of quantum transport in 256 split-gate devices. Appl. Phys. Lett., 102. 243102-.

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Abstract

We present a multiplexing scheme for the measurement of large numbers of mesoscopic devices in cryogenic systems. The multiplexer is used to contact an array of 256 split gates on a GaAs/AlGaAs heterostructure, in which each split gate can be measured individually. The low-temperature conductance of split-gate devices is governed by quantum mechanics, leading to the appearance of conductance plateaux at intervals of 2e^2/h. A fabrication-limited yield of 94% is achieved for the array, and a "quantum yield" is also defined, to account for disorder affecting the quantum behaviour of the devices. The quantum yield rose from 55% to 86% after illuminating the sample, explained by the corresponding increase in carrier density and mobility of the two-dimensional electron gas. The multiplexer is a scalable architecture, and can be extended to other forms of mesoscopic devices. It overcomes previous limits on the number of devices that can be fabricated on a single chip due to the number of electrical contacts available, without the need to alter existing experimental set ups.

Item Type: Article
Uncontrolled Keywords: cond-mat.mes-hall cond-mat.mes-hall
Subjects: UNSPECIFIED
Divisions: Div B > Solid State Electronics and Nanoscale Science
Depositing User: Cron Job
Date Deposited: 07 Mar 2014 11:24
Last Modified: 10 Nov 2014 01:06
DOI: 10.1063/1.4811376