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Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Suppression of Back-Tunneling Events in Hybrid Single-Electron Turnstiles by Source-Drain Bias Modulation
AU - Marín-Suárez, Marco
AU - Pashkin, Yuri
AU - Peltonen, Joonas T.
AU - Pekola, Jukka P.
PY - 2023/4/27
Y1 - 2023/4/27
N2 - The accuracy of single-electron currents produced in hybrid turnstiles at high operation frequencies is, among other errors, limited by electrons tunneling in the wrong direction. Increasing the barrier transparency between the island and the leads, and the source-drain bias helps to suppress these events in a larger frequency range, although they lead to some additional errors. We experimentally demonstrate a driving scheme that suppresses tunneling in the wrong direction hence extending the range of frequencies for generating accurate single-electron currents. The main feature of this approach is an additional AC signal applied to the bias with twice the frequency as the one applied to the gate electrode. This allows additional modulation of the island chemical potential. By using the new approach under certain parameters, we improve the single-electron current accuracy by one order of magnitude. Finally, we show through experimentally-contrasted calculations that our method can improve accuracy even in devices for which the usual gate driving gives errors ∼10^(−3) at high frequencies and can bring them under 5×10^(−4).
AB - The accuracy of single-electron currents produced in hybrid turnstiles at high operation frequencies is, among other errors, limited by electrons tunneling in the wrong direction. Increasing the barrier transparency between the island and the leads, and the source-drain bias helps to suppress these events in a larger frequency range, although they lead to some additional errors. We experimentally demonstrate a driving scheme that suppresses tunneling in the wrong direction hence extending the range of frequencies for generating accurate single-electron currents. The main feature of this approach is an additional AC signal applied to the bias with twice the frequency as the one applied to the gate electrode. This allows additional modulation of the island chemical potential. By using the new approach under certain parameters, we improve the single-electron current accuracy by one order of magnitude. Finally, we show through experimentally-contrasted calculations that our method can improve accuracy even in devices for which the usual gate driving gives errors ∼10^(−3) at high frequencies and can bring them under 5×10^(−4).
UR - https://journals.aps.org/prapplied/accepted/08071Af3Kb116d07c3db4ce0a83460606ceb97a6d
U2 - 10.1103/PhysRevApplied.19.044088
DO - 10.1103/PhysRevApplied.19.044088
M3 - Journal article
VL - 19
JO - Physical Review Applied
JF - Physical Review Applied
SN - 2331-7019
IS - 4
M1 - 044088
ER -