We have embedded an AlGaAs/GaAs based, gated 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 mK 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.
@article{arxiv.0810.5184,
title = {Radio-frequency reflectometry on large gated 2-dimensional systems},
author = {L. J. Taskinen and R. P. Starrett and T. P. Martin and A. P. Micolich and A. R. Hamilton and M. Y. Simmons and D. A. Ritchie and M. Pepper},
journal= {arXiv preprint arXiv:0810.5184},
year = {2009}
}
Comments
8 pages, 8 figures. Accepted for publication in Review of Scientific Instruments