Abstract
We report magnetotransport measurements on low-density, high-mobility two-dimensional (2D) electron systems in (Al,Ga)As/GaAs heterostructures down to Landau-level filling factors of . We observe a striking activated temperature dependence with onset near and continuing to smallest . The activation energy increase is approximately linear with decreasing and its slope depends monotonically on 2D density. While magnetic-field-induced localization cannot be ruled out, several features of the results are consistent with the formation of a pinned 2D Wigner crystal.
- Received 17 June 1988
DOI:https://doi.org/10.1103/PhysRevB.38.7881
©1988 American Physical Society