Semiconductor membranes for electrostatic exciton trapping in optically addressable quantum transport devices
Abstract
Combining the capabilities of gate defined quantum transport devices in GaAs-based heterostructures and of optically addressed self-assembled quantum dots could open broad perspectives for new devices and functionalities. For example, interfacing stationary solid-state qubits with photonic quantum states would open a new pathway towards the realization of a quantum network with extended quantum processing capacity in each node. While gated devices allow very flexible confinement of electrons or holes, the confinement of excitons without some element of self-assembly is much harder. To address this limitation, we introduce a technique to realize exciton traps in quantum wells via local electric fields by thinning a heterostructure down to a 220 nm thick membrane. We show that mobilities over $1 \times 10^{6}$ cm$^{2}$V$^{-1}$s$^{-1}$ can be retained and that quantum point contacts and Coulomb oscillations can be observed on this structure, which implies that the thinning does not compromise the heterostructure quality. Furthermore, the local lowering of the exciton energy via the quantum-confined Stark effect is confirmed, thus forming exciton traps. These results lay the technological foundations for devices like single photon sources, spin photon interfaces and eventually quantum network nodes in GaAs quantum wells, realized entirely with a top-down fabrication process.
Authors 11
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Jülich Aachen Research Alliance
Affiliation as printed
JARA-FIT Institute Quantum Information , Forschungszentrum Jülich GmbH and RWTH Aachen University , 52074 Aachen , Germany
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Jülich Aachen Research Alliance
Affiliation as printed
JARA-FIT Institute Quantum Information , Forschungszentrum Jülich GmbH and RWTH Aachen University , 52074 Aachen , Germany
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Jülich Aachen Research Alliance
Affiliation as printed
JARA-FIT Institute Quantum Information , Forschungszentrum Jülich GmbH and RWTH Aachen University , 52074 Aachen , Germany
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Jülich Aachen Research Alliance
Affiliation as printed
JARA-FIT Institute Quantum Information , Forschungszentrum Jülich GmbH and RWTH Aachen University , 52074 Aachen , Germany
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Forschungszentrum Jülich · Ernst Ruska Centre · Zhejiang University
Affiliation as printed
College of Information Science and Electronic Engineering , Zhe- jiang University , Hangzhou 310027 , China Now at: Key Laboratory of Semiconductor Material Science ,
Peter Grünberg Institute , Forschungszentrum Jülich GmbH , 52425 Jülich , Germany
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Forschungszentrum Jülich · Ernst Ruska Centre
Affiliation as printed
Peter Grünberg Institute , Forschungszentrum Jülich GmbH , 52425 Jülich , Germany
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Affiliation as printed
Lehrstuhl für Angewandte Festkörperphysik , Ruhr-Universität Bochum , D-44780 Bochum , Germany
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Chinese Academy of Sciences · Institute of Semiconductors · Ruhr University Bochum
Affiliation as printed
Beijing Key Laboratory of Low Dimensional Semiconductor Materials and Devices , In- stitute of Semiconductors , Chinese Academy of Sciences , Beijing 100083 , China
Lehrstuhl für Angewandte Festkörperphysik , Ruhr-Universität Bochum , D-44780 Bochum , Germany
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Affiliation as printed
Lehrstuhl für Angewandte Festkörperphysik , Ruhr-Universität Bochum , D-44780 Bochum , Germany
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Forschungszentrum Jülich · Ernst Ruska Centre · RWTH Aachen University
Affiliation as printed
Department of Physics , RWTH Aachen University , 52074 Aachen , Germany
Peter Grünberg Institute , Forschungszentrum Jülich GmbH , 52425 Jülich , Germany
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Jülich Aachen Research Alliance
Affiliation as printed
JARA-FIT Institute Quantum Information , Forschungszentrum Jülich GmbH and RWTH Aachen University , 52074 Aachen , Germany
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