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Giant frictional drag in strongly interacting bilayers near filling factor one

Authors
  • Tutuc, E.
  • Pillarisetty, R.
  • Shayegan, M.
Type
Published Article
Publication Date
Aug 27, 2008
Submission Date
Aug 27, 2008
Identifiers
DOI: 10.1103/PhysRevB.79.041303
Source
arXiv
License
Yellow
External links

Abstract

We study the frictional drag in high mobility, strongly interacting GaAs bilayer hole systems in the vicinity of the filling factor $\nu=1$ quantum Hall state (QHS), at the same fillings where the bilayer resistivity displays a reentrant insulating phase. Our measurements reveal a very large longitudinal drag resistivity ($\rho^{D}_{xx}$) in this regime, exceeding 15 k$\Omega/\Box$ at filling factor $\nu=1.15$. $\rho^{D}_{xx}$ 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 $\nu=1$ QHS embedded in a different state, when the system makes a transition from the coherent $\nu=1$ QHS to the weakly coupled $\nu=2$ QHS.

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