Fractional quantum Hall effect of composite fermions.
In a GaAs/AlGaAs quantum well of density 1 x 10(11) cm(-2) we observed a fractional quantum Hall effect (FQHE) at nu = 4/11 and 5/13, and weaker states at nu = 6/17, 4/13, 5/17, and 7/11. These sequences of fractions do not fit into the standard series of integral quantum Hall effects of composite fermions (CF) at nu = p/(2mp +/- 1). They rather can be regarded as the FQHE of CFs attesting to residual interactions between these composite particles. In tilted magnetic fields the nu = 4/11 state remains unchanged, strongly suggesting it to be spin polarized. The weak nu = 7/11 state vanishes quickly with tilt.
Pan
W
W
Department of Electrical Engineering, Princeton University, Princeton, New Jersey 08544, USA.
Stormer
H L
HL
Tsui
D C
DC
Pfeiffer
L N
LN
Baldwin
K W
KW
West
K W
KW