Radio-frequency reflectometry on large gated two-dimensional systems

We have embedded an AlGaAs/GaAs based, gated two-dimensional (2D) hole system (2DHS) into an impedance transformer LC circuit and show that by using radio-frequency reflectometry it is possible to perform sensitive, large bandwidth, electrical resistance measurements of 2D systems at millikelvin tem...

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Published inReview of scientific instruments Vol. 79; no. 12; p. 123901
Main Authors Taskinen, L J, Starrett, R P, Martin, T P, Micolich, A P, Hamilton, A R, Simmons, M Y, Ritchie, D A, Pepper, M
Format Journal Article
LanguageEnglish
Published United States 01.12.2008
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Summary:We have embedded an AlGaAs/GaAs based, gated two-dimensional (2D) hole system (2DHS) into an impedance transformer LC circuit and show that by using radio-frequency reflectometry it is possible to perform sensitive, large bandwidth, electrical resistance measurements of 2D systems at millikelvin temperatures. We construct a simple lumped element model where the gated 2DHS is described as a resistive transmission line. The model gives a qualitative understanding of the experimental results. As an example, we use our method to map out the Landau level evolution in a 2DHS as a function of magnetic field and gate voltage.
ISSN:1089-7623
DOI:10.1063/1.3030860