Disorder-enhanced nuclear spin relaxation at Landau level filling factor one*
Guan Tonga), Benedikt Friessb), Li Yong-Qinga)†, Yan Shi-Shenc), Vladimir Umanskyd), Klaus von Klitzingb), Jurgen H. Smetb)‡
       
(a) Temperature dependence of the nuclear spin relaxation rate 1/ T 1 at ν = 0.85 (squares), 1.00 (circles), and 0.76 (triangles) with B = 9 T. The solid lines are Arrhenius fits to the data. The gray dotted lines illustrate linear temperature dependence expected from the Korringa law. (b) Filling factor dependence of R xx at four temperatures between 20 mK and 100 mK.