Giant frictional drag in strongly interacting bilayers near filling factor one

Details Giant frictional drag in strongly interacting bilayers near filling factor one Giant frictional drag in strongly interacting bilayers near filling factor one

2008-08-28

arxiv.org/abs/0808.3807v1

Phys. Rev. B 79, 041303 (2009)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 4 figures

Scientific paper

10.1103/PhysRevB.79.041303

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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