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Termination of the series of fractional quantum Hall states at small filling factors
- Source :
- Physical review. B, Condensed matter. 38(11)
- Publication Year :
- 1988
-
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 $v\ensuremath{\sim}\frac{1}{18}$. We observe a striking activated temperature dependence with onset near $v\ensuremath{\sim}\frac{1}{5}$ and continuing to smallest $v$. The activation energy increase is approximately linear with decreasing $v$ 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.
Details
- ISSN :
- 01631829
- Volume :
- 38
- Issue :
- 11
- Database :
- OpenAIRE
- Journal :
- Physical review. B, Condensed matter
- Accession number :
- edsair.doi.dedup.....cbcd185780bf5a500d076e1f99970208