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

Research output: Contribution to journal › Article › peer-review

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 - Aug 31 2006

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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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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