title: Electron correlation in the second Landau level: a competition between many nearly degenerate quantum phases.
abstract: At a very low-temperature of 9 mK, electrons in the second Landau level of an extremely high-mobility two-dimensional electron system exhibit a very complex electronic behavior. With a varying filling factor, quantum liquids of different origins compete with several insulating phases leading to an irregular pattern in the transport parameters. We observe a fully developed nu=2+2/5 state separated from the even-denominator nu=2+1/2 state by an insulating phase and a nu=2+2/7 and nu=2+1/5 state surrounded by such phases. A developing plateau at nu=2+3/8 points to the existence of other even-denominator states.
authors.affiliation: University of Florida, Gainesville, Florida 32611, USA.
authors.forename: J S
authors.initials: JS
authors.lastname: Xia
authors.forename: W
authors.initials: W
authors.lastname: Pan
authors.forename: C L
authors.initials: CL
authors.lastname: Vicente
authors.forename: E D
authors.initials: ED
authors.lastname: Adams
authors.forename: N S
authors.initials: NS
authors.lastname: Sullivan
authors.forename: H L
authors.initials: HL
authors.lastname: Stormer
authors.forename: D C
authors.initials: DC
authors.lastname: Tsui
authors.forename: L N
authors.initials: LN
authors.lastname: Pfeiffer
authors.forename: K W
authors.initials: KW
authors.lastname: Baldwin
authors.forename: K W
authors.initials: KW
authors.lastname: West