Activated Transport in Magnetic-Field Induced Insulating Phase in Two-Dimensional Electron Gas in InGaAs/InP Heterostructures
B. Pődör, G. Gombos
Research Institute for Technical Physics of the Hungarian Academy of Sciences Budapest, Hungary

G. Reményi
CNRS Centre de Recherche sur les Tres Basses Températures et Laboratoire des Champs Magnétiques Intenses, Grenoble, France

Gy. Kovács
Applied Physics Research Group, Department of General Physics, Loránd Eötvös University, Budapest, Hungary

I.G. Savel'ev and S.V. Novikov
Ioffe Physical-Technical Institute of the Russian Academy of Sciences, St. Petersburg, Russia
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We report on experiments on low temperature (millikelvin range) activated magnetotransport on low-density two-dimensional electron systems in InGaAs/InP for Landau level filling factors 0.25 ≤ ν ≤ 0.55. The activation energy increases approximately linearly with decreasing filling factor. The observations are discussed in the light of the formation of the Wigner solid.
DOI: 10.12693/APhysPolA.92.945
PACS numbers: 73.20.Dx