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Remote Capacitive Sensing in Two-Dimensional Quantum-Dot Arrays

Duan, J; Fogarty, MA; Williams, J; Hutin, L; Vinet, M; Morton, JJL; (2020) Remote Capacitive Sensing in Two-Dimensional Quantum-Dot Arrays. Nano Letters , 20 (10) pp. 7123-7128. 10.1021/acs.nanolett.0c02393.

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Abstract

We investigate gate-induced quantum dots in silicon nanowire field-effect transistors fabricated using a foundry-compatible fully depleted silicon-on-insulator (FD-SOI) process. A series of split gates wrapped over the silicon nanowire naturally produces a 2 × n bilinear array of quantum dots along a single nanowire. We begin by studying the capacitive coupling of quantum dots within such a 2 × 2 array and then show how such couplings can be extended across two parallel silicon nanowires coupled together by shared, electrically isolated, “floating” electrodes. With one quantum dot operating as a single-electron-box sensor, the floating gate serves to enhance the charge sensitivity range, enabling it to detect charge state transitions in a separate silicon nanowire. By comparing measurements from multiple devices, we illustrate the impact of the floating gate by quantifying both the charge sensitivity decay as a function of dot-sensor separation and configuration within the dual-nanowire structure.

Type: Article
Title: Remote Capacitive Sensing in Two-Dimensional Quantum-Dot Arrays
Location: United States
DOI: 10.1021/acs.nanolett.0c02393
Publisher version: https://doi.org/10.1021/acs.nanolett.0c02393
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Quantum dots Reflectometry floating gate coupler electrostatic coupling
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology
URI: https://discovery.ucl.ac.uk/id/eprint/10111185
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