TITLE

Radio-frequency reflectometry on large gated two-dimensional systems

AUTHOR(S)
Taskinen, L. J.; Starrett, R. P.; Martin, T. P.; Micolich, A. P.; Hamilton, A. R.; Simmons, M. Y.; Ritchie, D. A.; Pepper, M.
PUB. DATE
December 2008
SOURCE
Review of Scientific Instruments;Dec2008, Vol. 79 Issue 12, p123901
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
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.
ACCESSION #
35982719

 

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