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 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.
Taskinen
L J
LJ
School of Physics, University of New South Wales, Sydney, New South Wales 2052, Australia.
Starrett
R P
RP
Martin
T P
TP
Micolich
A P
AP
Hamilton
A R
AR
Simmons
M Y
MY
Ritchie
D A
DA
Pepper
M
M