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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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 languageEnglish (US)
Article number083103
JournalApplied Physics Letters
Issue number8
Publication statusPublished - 2006


ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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