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

Department of Electrical Engineering

Arizona State University
General Dynamics
Sandia National Laboratories, New Mexico

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

25 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
Article number	083103
Journal	Applied Physics Letters
Volume	89
Issue number	8
DOIs	https://doi.org/10.1063/1.2337865
State	Published - 2006

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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.",

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AU - Heeren, J.

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AU - Bird, J. P.

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.

UR - https://www.scopus.com/pages/publications/33747842435

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DO - 10.1063/1.2337865

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VL - 89

JO - Applied Physics Letters

JF - Applied Physics Letters

IS - 8

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ER -

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

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