Pulsed measurements of the nonlinear conductance of quantum point contacts

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

doi:10.1063/1.2433038

Pulsed measurements of the nonlinear conductance 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

9 Scopus citations

Abstract

The conductance of quantum point contacts (QPCs) subject to strongly nonlinear source-drain biasing is investigated with transient pulses. The authors investigations reveal the presence of a characteristic fixed point, at which the transient conductance (Gt) is bias independent. This point corresponds to the situation where the unbiased QPC is almost depopulated and can apparently be accounted for by considering the unidirectional population of QPC subbands by the transient voltage. To discuss the variations of Gt away from the fixed point, it is necessary to consider the influence of the applied bias on the QPC profile and electron-phonon scattering.

Original language	English (US)
Article number	043103
Journal	Applied Physics Letters
Volume	90
Issue number	4
DOIs	https://doi.org/10.1063/1.2433038
State	Published - 2007

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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10.1063/1.2433038

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title = "Pulsed measurements of the nonlinear conductance of quantum point contacts",

abstract = "The conductance of quantum point contacts (QPCs) subject to strongly nonlinear source-drain biasing is investigated with transient pulses. The authors investigations reveal the presence of a characteristic fixed point, at which the transient conductance (Gt) is bias independent. This point corresponds to the situation where the unbiased QPC is almost depopulated and can apparently be accounted for by considering the unidirectional population of QPC subbands by the transient voltage. To discuss the variations of Gt away from the fixed point, it is necessary to consider the influence of the applied bias on the QPC profile and electron-phonon scattering.",

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

note = "Funding Information: This work was supported by the Department of Energy, NYSTAR, and the Office of Naval Research. This work was performed, in part, at the Center for Integrated Nanotechnologies, a U.S. DOE, Office of Basic Energy Sciences Nanoscale Science Research Center. Sandia National Laboratories is a multiprogram laboratory operated by Sandia Corporation, a Lockheed-Martin Company, for the U. S. Department of Energy under Contract No. DE-AC04-94AL85000. ",

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T1 - Pulsed measurements of the nonlinear conductance of quantum point contacts

AU - Naser, B.

AU - Ferry, D. K.

AU - Heeren, J.

AU - Reno, J. L.

AU - Bird, J. P.

N1 - Funding Information: This work was supported by the Department of Energy, NYSTAR, and the Office of Naval Research. This work was performed, in part, at the Center for Integrated Nanotechnologies, a U.S. DOE, Office of Basic Energy Sciences Nanoscale Science Research Center. Sandia National Laboratories is a multiprogram laboratory operated by Sandia Corporation, a Lockheed-Martin Company, for the U. S. Department of Energy under Contract No. DE-AC04-94AL85000.

PY - 2007

Y1 - 2007

N2 - The conductance of quantum point contacts (QPCs) subject to strongly nonlinear source-drain biasing is investigated with transient pulses. The authors investigations reveal the presence of a characteristic fixed point, at which the transient conductance (Gt) is bias independent. This point corresponds to the situation where the unbiased QPC is almost depopulated and can apparently be accounted for by considering the unidirectional population of QPC subbands by the transient voltage. To discuss the variations of Gt away from the fixed point, it is necessary to consider the influence of the applied bias on the QPC profile and electron-phonon scattering.

AB - The conductance of quantum point contacts (QPCs) subject to strongly nonlinear source-drain biasing is investigated with transient pulses. The authors investigations reveal the presence of a characteristic fixed point, at which the transient conductance (Gt) is bias independent. This point corresponds to the situation where the unbiased QPC is almost depopulated and can apparently be accounted for by considering the unidirectional population of QPC subbands by the transient voltage. To discuss the variations of Gt away from the fixed point, it is necessary to consider the influence of the applied bias on the QPC profile and electron-phonon scattering.

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ER -

Pulsed measurements of the nonlinear conductance of quantum point contacts

Abstract

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