title: Radio-frequency reflectometry on large gated two-dimensional systems.
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.
authors.affiliation: School of Physics, University of New South Wales, Sydney, New South Wales 2052, Australia.
authors.forename: L J
authors.initials: LJ
authors.lastname: Taskinen
authors.forename: R P
authors.initials: RP
authors.lastname: Starrett
authors.forename: T P
authors.initials: TP
authors.lastname: Martin
authors.forename: A P
authors.initials: AP
authors.lastname: Micolich
authors.forename: A R
authors.initials: AR
authors.lastname: Hamilton
authors.forename: M Y
authors.initials: MY
authors.lastname: Simmons
authors.forename: D A
authors.initials: DA
authors.lastname: Ritchie
authors.forename: M
authors.initials: M
authors.lastname: Pepper