Universality and Phase Diagram around Half-filled Landau Level
L. W. Wong, H. W. Jiang, W. J. Schaff
Abstract
Gated GaAs/AlGaAs heterostructures were used to determine the low-temperature behavior of the two-dimensional electron gas near filling factor nu=1/2 in the disorder-magnetic-field plane. We identify a line on which sigmaxy is temperature independent, has value sigmaxy=0.5 (e2/h), and a distinct line on which rhoxy=2 (h/e2). The phase boundaries between the Hall insulator and the principal quantum Hall liquids at nu=1 and 1/3 show levitation of the delocalized states of the first Landau levels for electrons and composite fermions. Finally, the data suggest that there is no true metallic phase around nu=1/2.
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