Persistent photoconductivity of GaAs/AlGaAs heterostructures has hampered the measurement of charge- and spin-related quantum effects in gate-defined quantum devices and integrated charge sensors due to Si-dopant-related deep donor levels (DX centers). In this study, this effect is overcome by using an undoped GaAs/AlGaAs heterostructure for photonic purposes. We also measure the electron transport before and after LED illumination at low temperatures. In addition to a regular rapid saturation showing the increased carrier density, a slow accumulation of illumination effects appeared when different top-gate voltages were applied during illumination, which indicated the redistribution of charge at the oxide–GaAs interface. This study provides interesting insights into the development of optically stable devices for efficient semiconductor quantum interfaces.
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21 June 2021
Research Article|
June 15 2021
Distinguishing persistent effects in an undoped GaAs/AlGaAs quantum well by top-gate-dependent illumination
Takafumi Fujita
;
Takafumi Fujita
a)
1
SANKEN, Osaka University
, 8-1 Mihogaoka, Ibaraki-shi, Osaka 567-0047, Japan
2
Center for Quantum Information and Quantum Biology (QIQB), Institute for Open and Transdisciplinary Research Initiatives, Osaka University
, Osaka 565-0871, Japan
3
Center for Spintronics Research Network (CSRN), Graduate School of Engineering Science, Osaka University
, Osaka 560-8531, Japan
a)Author to whom correspondence should be addressed: fujita@sanken.osaka-u.ac.jp
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Ryota Hayashi;
Ryota Hayashi
1
SANKEN, Osaka University
, 8-1 Mihogaoka, Ibaraki-shi, Osaka 567-0047, Japan
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Makoto Kohda
;
Makoto Kohda
4
Department of Materials Science, Tohoku University
, 6-6-02 Aramaki-Aza Aoba, Aoba-ku, Sendai 980-8579, Japan
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Julian Ritzmann
;
Julian Ritzmann
5
Lehrstuhl für Angewandte Festkörperphysik, Ruhr-Universität Bochum
, Universitätsstraße 150, Gebäude NB, D-44780 Bochum, Germany
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Arne Ludwig
;
Arne Ludwig
5
Lehrstuhl für Angewandte Festkörperphysik, Ruhr-Universität Bochum
, Universitätsstraße 150, Gebäude NB, D-44780 Bochum, Germany
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Junsaku Nitta
;
Junsaku Nitta
4
Department of Materials Science, Tohoku University
, 6-6-02 Aramaki-Aza Aoba, Aoba-ku, Sendai 980-8579, Japan
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Andreas D. Wieck
;
Andreas D. Wieck
5
Lehrstuhl für Angewandte Festkörperphysik, Ruhr-Universität Bochum
, Universitätsstraße 150, Gebäude NB, D-44780 Bochum, Germany
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Akira Oiwa
Akira Oiwa
1
SANKEN, Osaka University
, 8-1 Mihogaoka, Ibaraki-shi, Osaka 567-0047, Japan
2
Center for Quantum Information and Quantum Biology (QIQB), Institute for Open and Transdisciplinary Research Initiatives, Osaka University
, Osaka 565-0871, Japan
3
Center for Spintronics Research Network (CSRN), Graduate School of Engineering Science, Osaka University
, Osaka 560-8531, Japan
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a)Author to whom correspondence should be addressed: fujita@sanken.osaka-u.ac.jp
J. Appl. Phys. 129, 234301 (2021)
Article history
Received:
February 15 2021
Accepted:
May 28 2021
Citation
Takafumi Fujita, Ryota Hayashi, Makoto Kohda, Julian Ritzmann, Arne Ludwig, Junsaku Nitta, Andreas D. Wieck, Akira Oiwa; Distinguishing persistent effects in an undoped GaAs/AlGaAs quantum well by top-gate-dependent illumination. J. Appl. Phys. 21 June 2021; 129 (23): 234301. https://doi.org/10.1063/5.0047558
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