Phase diagram of interacting composite fermions in the bilayer nu=2/3 quantum hall effect.
We study the phase diagram of composite fermions (CFs) in the presence of spin and pseudospin degrees of freedom in the bilayer nu=2/3 quantum Hall (QH) state. Activation studies elucidate the existence of three different QH states with two different types of hysteresis in the magnetotransport. While a noninteracting CF model provides a qualitative account of the phase diagram, the observed renormalization of tunneling gap and a non-QH state at high densities are not explained in the noninteracting CF model, and are suggested to be manifestations of interactions between CFs.
Kumada
N
N
Department of Physics, Tohoku University, Sendai 980-8578, Japan.
Terasawa
D
D
Shimoda
Y
Y
Azuhata
H
H
Sawada
A
A
Ezawa
Z F
ZF
Muraki
K
K
Saku
T
T
Hirayama
Y
Y