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

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... Full description

Journal Title: Applied Physics Letters 17 June 2013, Vol.102(24)
Main Author: Al-Taie, H
Other Authors: Kelly, M. J , Cavendish Laboratory, Department of Physics, University of Cambridge, J. J. Thomson Avenue, Cambridge Cb3 0he , Smith, L. W , Xu, B , Griffiths, J. P , Beere, H. E , Jones, G. A. C , Ritchie, D. A , Smith, C. G , See, P
Format: Electronic Article Electronic Article
Language: English
Subjects:
ID: ISSN: 0003-6951 ; E-ISSN: 1077-3118 ; DOI: 10.1063/1.4811376
Link: https://www.osti.gov/biblio/22253547
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recordid: osti_s22253547
title: Cryogenic on-chip multiplexer for the study of quantum transport in 256 split-gate devices
format: Article
creator:
  • Al-Taie, H
  • Kelly, M. J
  • Cavendish Laboratory, Department of Physics, University of Cambridge, J. J. Thomson Avenue, Cambridge Cb3 0he
  • Smith, L. W
  • Xu, B
  • Griffiths, J. P
  • Beere, H. E
  • Jones, G. A. C
  • Ritchie, D. A
  • Smith, C. G
  • See, P
subjects:
  • Condensed Matter Physics, Superconductivity And Superfluidity
  • Classical And Quantum Mechanics, General Physics
  • Aluminium Arsenides
  • Carrier Density
  • Electric Contacts
  • Electron GAS
  • Fabrication
  • Gallium Arsenides
  • Mobility
  • Multiplexers
  • Quantum Mechanics
  • Engineering
  • Physics
ispartof: Applied Physics Letters, 17 June 2013, Vol.102(24)
description: 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{sup 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.
language: eng
source:
identifier: ISSN: 0003-6951 ; E-ISSN: 1077-3118 ; DOI: 10.1063/1.4811376
fulltext: fulltext
issn:
  • 0003-6951
  • 00036951
  • 1077-3118
  • 10773118
url: Link


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titleCryogenic on-chip multiplexer for the study of quantum transport in 256 split-gate devices
creatorAl-Taie, H ; Kelly, M. J ; Cavendish Laboratory, Department of Physics, University of Cambridge, J. J. Thomson Avenue, Cambridge Cb3 0he ; Smith, L. W ; Xu, B ; Griffiths, J. P ; Beere, H. E ; Jones, G. A. C ; Ritchie, D. A ; Smith, C. G ; See, P
ispartofApplied Physics Letters, 17 June 2013, Vol.102(24)
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subjectCondensed Matter Physics, Superconductivity And Superfluidity ; Classical And Quantum Mechanics, General Physics ; Aluminium Arsenides ; Carrier Density ; Electric Contacts ; Electron GAS ; Fabrication ; Gallium Arsenides ; Mobility ; Multiplexers ; Quantum Mechanics ; Engineering ; Physics
descriptionWe 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{sup 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.
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titleCryogenic on-chip multiplexer for the study of quantum transport in 256 split-gate devices
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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{sup 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.

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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{sup 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.

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date2013-06-17