Figure 4: Longitudinal transport, comparison with microwave resonance spectroscopy.
From: Microwave spectroscopic observation of distinct electron solid phases in wide quantum wells
(a,b) Longitudinal resistance versus partial Landau level filling v* measured for the 54 nm (a) and the 65 nm (b) wells at different densities n as marked, vertically offset for clarity. Arrows mark 
*, the critical partial filling factor. Where Rxx is small, the trace in the region of 
* are duplicated and magnified 10 times for clarity. (c) |
*| versus n on a log–log scale deduced from d.c. transport measurements (open symbols) and microwave spectra (solid symbols) for the 54 nm (squares) and 65 nm (circles). Error bars are based on the width of 
*. Power law fits of the form 
*∝n−α are also shown on the plot, where α=1.35±0.1 and 0.87±0.07 for the 54 and 65 nm wells, respectively.
