Detailed results of ρxx and ρxy at low T. The B dependences of ρxx and ρxy at various T ranging from 0.3 to 1.5 K for (a)Vg = −0.125 V, (b)Vg =−0.145 V, and (c)Vg = −0.165 V. The insets are the zoom-ins of low-field ρxx(B). The dashed lines are the fits to Equation 4 at the lowest T. For comparison, the results at the lowest T for each Vg are re-plotted in (d). The T-independent points corresponding to the direct I-QH transition are indicated by vertical lines, and those for the crossings of ρxx and ρxy are denoted by arrows. Other T-independent points are indicated by circles.
Lo et al. Nanoscale Research Letters 2013 8:307 doi:10.1186/1556-276X-8-307