Transport measurements in SISNSIS single-electron transistors

Mika Sillanpää; Jari S. Penttilä; Mikko A. Paalanen; Pertti J. Hakonen

doi:10.1016/S0921-4526(99)03037-9

Transport measurements in SISNSIS single-electron transistors

Mika Sillanpää, Jari S. Penttilä, Mikko A. Paalanen, Pertti J. Hakonen

Aalto University

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

Abstract

We have measured IV-characteristics of a superconducting single-electron transistor (SET) whose island consists of SNS (Al-Cu-Al or Al-Cr-Al) structure with lengths 0.4, 0.15 and 0.4 μm, respectively. In samples with copper, a supercurrent as well as resonances are observed at small bias, and the samples behave like regular SSS SETs. The amplitude of Josephson-quasiparticle (JQP) peaks, however, displays strong variation with gate modulation, even though the Coulomb energy is small (island capacitance ∼1 fF). Chrome sections on the island result in a smooth, exponentially varying sub-gap current that can be modeled with the voltage fluctuation theory.

Original language	English
Pages (from-to)	1826-1827
Number of pages	2
Journal	Physica B: Condensed Matter
Volume	284-288
Issue number	PART II
DOIs	https://doi.org/10.1016/S0921-4526(99)03037-9
Publication status	Published - 2000
Externally published	Yes

Keywords

JQP cycle
Johnson noise
Proximity effect
Single electron transistor

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Electrical and Electronic Engineering

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10.1016/S0921-4526(99)03037-9

Cite this

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title = "Transport measurements in SISNSIS single-electron transistors",

abstract = "We have measured IV-characteristics of a superconducting single-electron transistor (SET) whose island consists of SNS (Al-Cu-Al or Al-Cr-Al) structure with lengths 0.4, 0.15 and 0.4 μm, respectively. In samples with copper, a supercurrent as well as resonances are observed at small bias, and the samples behave like regular SSS SETs. The amplitude of Josephson-quasiparticle (JQP) peaks, however, displays strong variation with gate modulation, even though the Coulomb energy is small (island capacitance ∼1 fF). Chrome sections on the island result in a smooth, exponentially varying sub-gap current that can be modeled with the voltage fluctuation theory.",

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T1 - Transport measurements in SISNSIS single-electron transistors

AU - Sillanpää, Mika

AU - Penttilä, Jari S.

AU - Paalanen, Mikko A.

AU - Hakonen, Pertti J.

PY - 2000

Y1 - 2000

N2 - We have measured IV-characteristics of a superconducting single-electron transistor (SET) whose island consists of SNS (Al-Cu-Al or Al-Cr-Al) structure with lengths 0.4, 0.15 and 0.4 μm, respectively. In samples with copper, a supercurrent as well as resonances are observed at small bias, and the samples behave like regular SSS SETs. The amplitude of Josephson-quasiparticle (JQP) peaks, however, displays strong variation with gate modulation, even though the Coulomb energy is small (island capacitance ∼1 fF). Chrome sections on the island result in a smooth, exponentially varying sub-gap current that can be modeled with the voltage fluctuation theory.

AB - We have measured IV-characteristics of a superconducting single-electron transistor (SET) whose island consists of SNS (Al-Cu-Al or Al-Cr-Al) structure with lengths 0.4, 0.15 and 0.4 μm, respectively. In samples with copper, a supercurrent as well as resonances are observed at small bias, and the samples behave like regular SSS SETs. The amplitude of Josephson-quasiparticle (JQP) peaks, however, displays strong variation with gate modulation, even though the Coulomb energy is small (island capacitance ∼1 fF). Chrome sections on the island result in a smooth, exponentially varying sub-gap current that can be modeled with the voltage fluctuation theory.

KW - JQP cycle

KW - Johnson noise

KW - Proximity effect

KW - Single electron transistor

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VL - 284-288

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JO - Physica B: Condensed Matter

JF - Physica B: Condensed Matter

IS - PART II

ER -

Transport measurements in SISNSIS single-electron transistors

Abstract

Keywords

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