Enhancement-mode two-channel triple quantum dot from an undoped Si/Si0.8Ge0.2 quantum well hetero-structure
- National Research Council of Canada, Ottawa, ON (Canada)
- National Research Council of Canada, Ottawa, ON (Canada); Tohoku Univ., Miyagi (Japan)
Here, we demonstrate coupled triple dot operation and charge sensing capability for the recently introduced quantum dot technology employing undoped Si/Si0.8Ge0.2 hetero-structures which also incorporate a single metal-gate layer to simplify fabrication. Si/SiGe hetero-structures with a Ge concentration of 20% rather than the more usual 30% typically encountered offer higher electron mobility. The devices consist of two in-plane parallel electron channels that host a double dot in one channel and a single dot in the other channel. In a device where the channels are sufficiently close a triple dot in a triangular configuration is induced leading to regions in the charge stability diagram where three charge-addition lines of different slope approach each other and anti-cross. In a device where the channels are further apart, the single dot charge-senses the double dot with relative change of ~2% in the sensor current.
- Research Organization:
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
- Sponsoring Organization:
- USDOE National Nuclear Security Administration (NNSA)
- Grant/Contract Number:
- AC04-94AL85000
- OSTI ID:
- 1457184
- Report Number(s):
- SAND-2017-13809J; 659682
- Journal Information:
- Applied Physics Letters, Vol. 112, Issue 23; ISSN 0003-6951
- Publisher:
- American Institute of Physics (AIP)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
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journal | February 2019 |
Applied Physics Letters welcomes papers in Quantum Technologies
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journal | January 2020 |
Single and double hole quantum dots in strained Ge/SiGe quantum wells
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journal | March 2019 |
Spin-Blockade Spectroscopy of Si / Si - Ge Quantum Dots
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journal | July 2019 |
Single and Double Hole Quantum Dots in Strained Ge/SiGe Quantum Wells | text | January 2018 |
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