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Type: Journal article
Title: Gigahertz single-electron pumping mediated by parasitic states
Author: Rossi, A.
Klochan, J.
Timoshenko, J.
Hudson, F.
Möttönen, M.
Rogge, S.
Dzurak, A.
Kashcheyevs, V.
Tettamanzi, G.
Citation: Nano Letters: a journal dedicated to nanoscience and nanotechnology, 2018; 18(7):4141-4147
Publisher: American Chemical Society
Issue Date: 2018
ISSN: 1530-6984
Statement of
Alessandro Rossi, Jevgeny Klochan, Janis Timoshenko, Fay E. Hudson, Mikko Möttönen, Sven Rogge, Andrew S. Dzurak, Vyacheslavs Kashcheyevs, and Giuseppe C. Tettamanzi
Abstract: In quantum metrology, semiconductor single-electron pumps are used to generate accurate electric currents with the ultimate goal of implementing the emerging quantum standard of the ampere. Pumps based on electrostatically defined tunable quantum dots (QDs) have thus far shown the most promising performance in combining fast and accurate charge transfer. However, at frequencies exceeding approximately 1 GHz the accuracy typically decreases. Recently, hybrid pumps based on QDs coupled to trap states have led to increased transfer rates due to tighter electrostatic confinement. Here, we operate a hybrid electron pump in silicon obtained by coupling a QD to multiple parasitic states and achieve robust current quantization up to a few gigahertz. We show that the fidelity of the electron capture depends on the sequence in which the parasitic states become available for loading, resulting in distinctive frequency-dependent features in the pumped current.
Keywords: Quantum dot
single-electron pump
quantum electrical metrology
Description: Published: June 19, 2018
Rights: © 2018 American Chemical Society
DOI: 10.1021/acs.nanolett.8b00874
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