Current-voltage spectroscopy of the subband structure of strongly pinched-off quantum point contacts

J. Song; Y. Kawano; K. Ishibashi; J. Mikalopas; G. R. Aizin; N. Aoki; J. L. Reno; Y. Ochiai; J. P. Bird

doi:10.1063/1.3272677

Current-voltage spectroscopy of the subband structure of strongly pinched-off quantum point contacts

J. Song
, Y. Kawano
, K. Ishibashi
, J. Mikalopas
, G. R. Aizin
, N. Aoki
, J. L. Reno
, Y. Ochiai
, J. P. Bird

Department of Electrical Engineering

SUNY Buffalo
RIKEN
City University of New York
Chiba University
Sandia National Laboratories, New Mexico

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

6 Scopus citations

Abstract

We demonstrate current-voltage spectroscopy of the one-dimensional subband structure of pinched-off quantum point contacts (QPCs). This technique yields the full subband structure and effective barrier of the QPC, without the need to perform an undesirable average over a range of gate voltage. Our measurements reveal strong asymmetry in the potential drop across the QPC, and a significantly enhanced subband spacing, in the pinch-off regime.

Original language	English
Article number	233115
Journal	Applied Physics Letters
Volume	95
Issue number	23
DOIs	https://doi.org/10.1063/1.3272677
State	Published - 2009

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10.1063/1.3272677

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abstract = "We demonstrate current-voltage spectroscopy of the one-dimensional subband structure of pinched-off quantum point contacts (QPCs). This technique yields the full subband structure and effective barrier of the QPC, without the need to perform an undesirable average over a range of gate voltage. Our measurements reveal strong asymmetry in the potential drop across the QPC, and a significantly enhanced subband spacing, in the pinch-off regime.",

author = "J. Song and Y. Kawano and K. Ishibashi and J. Mikalopas and Aizin, \{G. R.\} and N. Aoki and Reno, \{J. L.\} and Y. Ochiai and Bird, \{J. P.\}",

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AU - Song, J.

AU - Kawano, Y.

AU - Ishibashi, K.

AU - Mikalopas, J.

AU - Aizin, G. R.

AU - Aoki, N.

AU - Reno, J. L.

AU - Ochiai, Y.

AU - Bird, J. P.

PY - 2009

Y1 - 2009

N2 - We demonstrate current-voltage spectroscopy of the one-dimensional subband structure of pinched-off quantum point contacts (QPCs). This technique yields the full subband structure and effective barrier of the QPC, without the need to perform an undesirable average over a range of gate voltage. Our measurements reveal strong asymmetry in the potential drop across the QPC, and a significantly enhanced subband spacing, in the pinch-off regime.

AB - We demonstrate current-voltage spectroscopy of the one-dimensional subband structure of pinched-off quantum point contacts (QPCs). This technique yields the full subband structure and effective barrier of the QPC, without the need to perform an undesirable average over a range of gate voltage. Our measurements reveal strong asymmetry in the potential drop across the QPC, and a significantly enhanced subband spacing, in the pinch-off regime.

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DO - 10.1063/1.3272677

M3 - Article

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SN - 0003-6951

VL - 95

JO - Applied Physics Letters

JF - Applied Physics Letters

IS - 23

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ER -

Current-voltage spectroscopy of the subband structure of strongly pinched-off quantum point contacts

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