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) R xx at ν = 1/2 as a function of the total magnetic field, B tot, at the base temperature for perpendicular fields B = 6, 9, and 12 T. Increasing of B tot leads to transitions from partial to full spin polarization, which are marked by short vertical lines. The arrows denote regions of full spin polarization. (b) A fraction of the measurement sequence for the nuclear spin relaxation measurements. The bottom panel shows an example of an R xx – t trace (circles) and the exponential decay fit to Eq. ( 1 ) (line). (c) An example of how to extract time constant τ 1 with a fit of the Δ R xx data extracted from the procedure illustrated in panel (b) to Eq. ( 2 ).