Competition between a fractional quantum hall liquid and bubble and Wigner crystal phases in the third Landau level.
Magnetotransport measurements were performed in an ultrahigh mobility GaAs/AlGaAs quantum well of density approximately 3.0 x 10(11) cm(-2). The temperature dependence of the magnetoresistance Rxx was studied in detail in the vicinity of nu=9/2. In particular, we discovered new minima in Rxx at a filling factor nu approximately 41/5 and 44/5, but only at intermediate temperatures 80 approximately less than T approximately less than 120 mK. We interpret these as evidence for a fractional quantum Hall liquid forming in the N=2 Landau level and competing with bubble and Wigner crystal phases favored at lower temperatures. Our data suggest that a magnetically driven insulator-insulator quantum phase transition occurs between the bubble and Wigner crystal phases at T=0.
Gervais
G
G
Department of Physics and Department of Applied Physics, Columbia University, New York, New York 10027, USA.
Engel
L W
LW
Stormer
H L
HL
Tsui
D C
DC
Baldwin
K W
KW
West
K W
KW
Pfeiffer
L N
LN