title: Phase diagram of interacting composite fermions in the bilayer nu=2/3 quantum hall effect.
abstract: 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.
authors.affiliation: Department of Physics, Tohoku University, Sendai 980-8578, Japan.
authors.forename: N
authors.initials: N
authors.lastname: Kumada
authors.forename: D
authors.initials: D
authors.lastname: Terasawa
authors.forename: Y
authors.initials: Y
authors.lastname: Shimoda
authors.forename: H
authors.initials: H
authors.lastname: Azuhata
authors.forename: A
authors.initials: A
authors.lastname: Sawada
authors.forename: Z F
authors.initials: ZF
authors.lastname: Ezawa
authors.forename: K
authors.initials: K
authors.lastname: Muraki
authors.forename: T
authors.initials: T
authors.lastname: Saku
authors.forename: Y
authors.initials: Y
authors.lastname: Hirayama