2008/08/28 by E. Tutuc, Emanuel Tutuc, R. Pillarisetty +1
Physics and Astronomy · #Physics of Superconductivity and Magnetism #Quantum and electron transport phenomena #Theoretical and Computational Physics #cond-mat.mes-hall #cond-mat.mtrl-sci
paper · pdf · doi:10.1103/physrevb.79.041303
published as Phys. Rev. B 79, 041303 (2009) · 4 pages, 4 figures
arxiv created 2008/08/28 · openalex publication_date 2009/01/16 · arxiv updated 2010/11/03 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We study the frictional drag in high mobility, strongly interacting GaAs bilayer hole systems in the vicinity of the filling factor \ensuremathν=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 (\ensuremathρxxD) in this regime, exceeding 15 k\ensuremathΩ/◻ at filling factor \ensuremathν=1.15. \ensuremathρxxD 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 \ensuremathν=1 QHS embedded in a different state, when the system makes a transition from the coherent \ensuremathν=1 QHS to the weakly coupled \ensuremathν=2 QHS.