Three-waveform bidirectional pumping of single electrons with a silicon quantum dot.
Semiconductor-based quantum dot single-electron pumps are currently the most promising candidates for the direct realization of the emerging quantum standard of the ampere in the International System of Units. Here, we discuss a silicon quantum dot single-electron pump with radio frequency control over the transparencies of entrance and exit barriers as well as the dot potential. We show that our driving protocol leads to robust bidirectional pumping: one can conveniently reverse the direction of the quantized current by changing only the phase shift of one driving waveform with respect to the others. We anticipate that this pumping technique may be used in the future to perform error counting experiments by pumping the electrons into and out of a reservoir island monitored by a charge sensor.
Aalto University, QCD Labs, COMP Centre of Excellence, Department of Applied Physics, Aalto, 00076, Finland.|University of New South Wales, School of Electrical Engineering &Telecommunications, Sydney, 2052, Australia.
Tuomo
T
Tanttu
University of New South Wales, School of Electrical Engineering &Telecommunications, Sydney, 2052, Australia.
Alessandro
A
Rossi
Aalto University, QCD Labs, COMP Centre of Excellence, Department of Applied Physics, Aalto, 00076, Finland.
Kuan Yen
KY
Tan
Aalto University, QCD Labs, COMP Centre of Excellence, Department of Applied Physics, Aalto, 00076, Finland.
Akseli
A
Mäkinen
University of New South Wales, School of Electrical Engineering &Telecommunications, Sydney, 2052, Australia.
Kok Wai
KW
Chan
University of New South Wales, School of Electrical Engineering &Telecommunications, Sydney, 2052, Australia.
Andrew S
AS
Dzurak
Aalto University, QCD Labs, COMP Centre of Excellence, Department of Applied Physics, Aalto, 00076, Finland.
Mikko
M
Möttönen