Environmentally activated tunneling events in a hybrid single-electron box

O-P. Saira, M. Möttönen, V.F. Maisi, J.P. Pekola

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

We have measured individual tunneling events and Coulomb step shapes in single-electron boxes with opaque superconductor–normal metal tunnel junctions. We observe anomalous broadening of the Coulomb step with decreasing temperature in a manner that is consistent with activation of first-order tunneling events by an external dissipative electromagnetic environment. We demonstrate that the rates for energetically unfavorable tunneling events saturate to finite values at low temperatures, and that the saturation level can be suppressed by more than an order of magnitude by a capacitive shunt near the device. The findings are important in assessing the performance limits of any single-electronic device. In particular, master-equation-based simulations show that the electromagnetic environment realized in the capacitively shunted devices allows for a metrologically accurate charge pump based on hybrid tunnel junctions.
Original languageEnglish
JournalPhysical Review B: Condensed Matter and Materials Physics
Volume82
Issue number15
DOIs
Publication statusPublished - 2010
MoE publication typeA1 Journal article-refereed

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Tunnel junctions
boxes
tunnel junctions
Electron tunneling
Electrons
electromagnetism
electrons
Metals
Chemical activation
shunts
Pumps
Temperature
activation
pumps
saturation
electronics
metals
simulation
temperature

Cite this

Saira, O-P. ; Möttönen, M. ; Maisi, V.F. ; Pekola, J.P. / Environmentally activated tunneling events in a hybrid single-electron box. In: Physical Review B: Condensed Matter and Materials Physics. 2010 ; Vol. 82, No. 15.
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Environmentally activated tunneling events in a hybrid single-electron box. / Saira, O-P.; Möttönen, M.; Maisi, V.F.; Pekola, J.P.

In: Physical Review B: Condensed Matter and Materials Physics, Vol. 82, No. 15, 2010.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Environmentally activated tunneling events in a hybrid single-electron box

AU - Saira, O-P.

AU - Möttönen, M.

AU - Maisi, V.F.

AU - Pekola, J.P.

PY - 2010

Y1 - 2010

N2 - We have measured individual tunneling events and Coulomb step shapes in single-electron boxes with opaque superconductor–normal metal tunnel junctions. We observe anomalous broadening of the Coulomb step with decreasing temperature in a manner that is consistent with activation of first-order tunneling events by an external dissipative electromagnetic environment. We demonstrate that the rates for energetically unfavorable tunneling events saturate to finite values at low temperatures, and that the saturation level can be suppressed by more than an order of magnitude by a capacitive shunt near the device. The findings are important in assessing the performance limits of any single-electronic device. In particular, master-equation-based simulations show that the electromagnetic environment realized in the capacitively shunted devices allows for a metrologically accurate charge pump based on hybrid tunnel junctions.

AB - We have measured individual tunneling events and Coulomb step shapes in single-electron boxes with opaque superconductor–normal metal tunnel junctions. We observe anomalous broadening of the Coulomb step with decreasing temperature in a manner that is consistent with activation of first-order tunneling events by an external dissipative electromagnetic environment. We demonstrate that the rates for energetically unfavorable tunneling events saturate to finite values at low temperatures, and that the saturation level can be suppressed by more than an order of magnitude by a capacitive shunt near the device. The findings are important in assessing the performance limits of any single-electronic device. In particular, master-equation-based simulations show that the electromagnetic environment realized in the capacitively shunted devices allows for a metrologically accurate charge pump based on hybrid tunnel junctions.

U2 - 10.1103/PhysRevB.82.155443

DO - 10.1103/PhysRevB.82.155443

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JO - Physical Review B

JF - Physical Review B

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