Year: 2014
Type: article
Abstract: For a series of samples with two-dimensional electron systems in dilute ${\text{Al}}_{x}$${\text{Ga}}_{1\ensuremath{-}x}$As, with varying $x$ from $0%$ to $0.85%$, we survey the pinning mode resonances of Wigner solids at the low Landau filling termination of the fractional quantum Hall effect series. For all $x$ studied, the pinning modes are present with frequencies ${f}_{\mathrm{pk}}$ that are consistent with collective weak pinning. For $x\ensuremath{\ge}0.22%$ we find ${f}_{\mathrm{pk}}$ vs $B$ exhibits a rapid increase that is not present for $x=0$. We find the observed ${f}_{\mathrm{pk}}$ is much smaller than values calculated with a simple Wigner solid model which neglects the effects of the disorder on the charge distribution of a carrier.
Source: Physical Review B
Institutions: National High Magnetic Field Laboratory, Princeton University
Language: English
Subfield: Condensed Matter Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2020299762