Giant frictional drag in strongly interacting bilayers near filling factor one

E. Tutuc, R. Pillarisetty, M. Shayegan

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Abstract

We study the frictional drag in high mobility, strongly interacting GaAs bilayer hole systems in the vicinity of the filling factor ν=1 quantum Hall state (QHS) at the same fillings where the bilayer resistivity displays a re-entrant insulating phase. Our measurements reveal a very large longitudinal drag resistivity (ρ xx D) in this regime, exceeding 15 kΩ/□ at filling factor ν=1.15. ρ xx D shows a weak temperature dependence and appears to saturate at a finite, large value at the lowest temperatures. Our observations are consistent with theoretical models positing a phase separation, e.g., puddles of ν=1 QHS embedded in a different state, when the system makes a transition from the coherent ν=1 QHS to the weakly coupled ν=2 QHS.

Original languageEnglish (US)
Article number041303
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume79
Issue number4
DOIs
StatePublished - Jan 5 2009

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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