Large capacitance in the nanosecond-scale transient response of quantum point contacts

B. Naser; D. K. Ferry; J. Heeren; J. L. Reno; J. P. Bird

doi:10.1063/1.2337865

Large capacitance in the nanosecond-scale transient response of quantum point contacts

B. Naser, D. K. Ferry, J. Heeren, J. L. Reno, J. P. Bird

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22 Scopus citations

Abstract

The transient electrical response of split-gate quantum point contacts (QPCs) is investigated using ultrashort voltage pulses with rise times as small as 2 ns. Our measurements reveal a large (∼1 nF) parallel capacitance under conditions where the QPC is formed. The capacitance is independent of the QPC gate geometry, and the amplitude and rise time of the applied transient pulse. Some speculations on the source of this capacitance are offered.

Original language	English (US)
Article number	083103
Journal	Applied Physics Letters
Volume	89
Issue number	8
DOIs	https://doi.org/10.1063/1.2337865
State	Published - 2006

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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10.1063/1.2337865

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title = "Large capacitance in the nanosecond-scale transient response of quantum point contacts",

abstract = "The transient electrical response of split-gate quantum point contacts (QPCs) is investigated using ultrashort voltage pulses with rise times as small as 2 ns. Our measurements reveal a large (∼1 nF) parallel capacitance under conditions where the QPC is formed. The capacitance is independent of the QPC gate geometry, and the amplitude and rise time of the applied transient pulse. Some speculations on the source of this capacitance are offered.",

author = "B. Naser and Ferry, {D. K.} and J. Heeren and Reno, {J. L.} and Bird, {J. P.}",

note = "Funding Information: This work is sponsored by the the Department of Energy and NYSTAR. The authors acknowledge valuable discussions with M. B{\"u}ttiker, L. Mourokh, and L. Worschech.",

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AU - Naser, B.

AU - Ferry, D. K.

AU - Heeren, J.

AU - Reno, J. L.

AU - Bird, J. P.

N1 - Funding Information: This work is sponsored by the the Department of Energy and NYSTAR. The authors acknowledge valuable discussions with M. Büttiker, L. Mourokh, and L. Worschech.

PY - 2006

Y1 - 2006

N2 - The transient electrical response of split-gate quantum point contacts (QPCs) is investigated using ultrashort voltage pulses with rise times as small as 2 ns. Our measurements reveal a large (∼1 nF) parallel capacitance under conditions where the QPC is formed. The capacitance is independent of the QPC gate geometry, and the amplitude and rise time of the applied transient pulse. Some speculations on the source of this capacitance are offered.

AB - The transient electrical response of split-gate quantum point contacts (QPCs) is investigated using ultrashort voltage pulses with rise times as small as 2 ns. Our measurements reveal a large (∼1 nF) parallel capacitance under conditions where the QPC is formed. The capacitance is independent of the QPC gate geometry, and the amplitude and rise time of the applied transient pulse. Some speculations on the source of this capacitance are offered.

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Large capacitance in the nanosecond-scale transient response of quantum point contacts

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