Back-gated point contact

Katsushi Hashimoto; Sen Miyashita; Tadashi Saku; Yoshiro Hirayama

doi:10.1143/jjap.40.3000

Back-gated point contact

Katsushi Hashimoto, Sen Miyashita, Tadashi Saku, Yoshiro Hirayama

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

19 Citations (Scopus)

Abstract

In this study, we fabricated split gates on a back-gated undoped heterostructure to perform transport measurements on a quantum point contact (QPC). Using this back-gated QPC system, we obtained clear quantized conductance plateaus over a wide range of electron densities (1.2 × 10¹⁵ m^-2 to 3.3 × 10¹⁵ m^-2) without being affected by imperfections. We also observed a clear 0.7 G₀ (G₀ = 2e²/h) anomaly. The shape of the anomaly varies with electron density. Furthermore, the conductance value at which this anomaly appears is not precisely 0.7 G₀ but changes with electron density.

Original language	English
Pages (from-to)	3000-3002
Number of pages	3
Journal	Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Volume	40
Issue number	4 B
DOIs	https://doi.org/10.1143/jjap.40.3000
Publication status	Published - 2001 Apr
Externally published	Yes

Keywords

0.7 G anomaly
Back-gate
Point contact
Quantized conductance
Undoped GaAs/AlGaAs single heterostructure

ASJC Scopus subject areas

Engineering(all)
Physics and Astronomy(all)

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10.1143/jjap.40.3000

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title = "Back-gated point contact",

abstract = "In this study, we fabricated split gates on a back-gated undoped heterostructure to perform transport measurements on a quantum point contact (QPC). Using this back-gated QPC system, we obtained clear quantized conductance plateaus over a wide range of electron densities (1.2 × 1015 m-2 to 3.3 × 1015 m-2) without being affected by imperfections. We also observed a clear 0.7 G0 (G0 = 2e2/h) anomaly. The shape of the anomaly varies with electron density. Furthermore, the conductance value at which this anomaly appears is not precisely 0.7 G0 but changes with electron density.",

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author = "Katsushi Hashimoto and Sen Miyashita and Tadashi Saku and Yoshiro Hirayama",

year = "2001",

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doi = "10.1143/jjap.40.3000",

language = "English",

volume = "40",

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T1 - Back-gated point contact

AU - Hashimoto, Katsushi

AU - Miyashita, Sen

AU - Saku, Tadashi

AU - Hirayama, Yoshiro

PY - 2001/4

Y1 - 2001/4

N2 - In this study, we fabricated split gates on a back-gated undoped heterostructure to perform transport measurements on a quantum point contact (QPC). Using this back-gated QPC system, we obtained clear quantized conductance plateaus over a wide range of electron densities (1.2 × 1015 m-2 to 3.3 × 1015 m-2) without being affected by imperfections. We also observed a clear 0.7 G0 (G0 = 2e2/h) anomaly. The shape of the anomaly varies with electron density. Furthermore, the conductance value at which this anomaly appears is not precisely 0.7 G0 but changes with electron density.

AB - In this study, we fabricated split gates on a back-gated undoped heterostructure to perform transport measurements on a quantum point contact (QPC). Using this back-gated QPC system, we obtained clear quantized conductance plateaus over a wide range of electron densities (1.2 × 1015 m-2 to 3.3 × 1015 m-2) without being affected by imperfections. We also observed a clear 0.7 G0 (G0 = 2e2/h) anomaly. The shape of the anomaly varies with electron density. Furthermore, the conductance value at which this anomaly appears is not precisely 0.7 G0 but changes with electron density.

KW - 0.7 G anomaly

KW - Back-gate

KW - Point contact

KW - Quantized conductance

KW - Undoped GaAs/AlGaAs single heterostructure

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DO - 10.1143/jjap.40.3000

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JO - Japanese Journal of Applied Physics, Part 1: Regular Papers & Short Notes

JF - Japanese Journal of Applied Physics, Part 1: Regular Papers & Short Notes

SN - 0021-4922

IS - 4 B

ER -

Back-gated point contact

Abstract

Keywords

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