title: Canted antiferromagnetic phase in a double quantum well in a tilted quantizing magnetic field.
abstract: We investigate the double-layer electron system in a parabolic quantum well at filling factor nu=2 in a tilted magnetic field using capacitance spectroscopy. The competition between two ground states is found at the Zeeman splitting appreciably smaller than the symmetric-antisymmetric splitting. Although at the transition point the system breaks up into domains of the two competing states, the activation energy turns out to be finite, signaling the occurrence of a new insulator-insulator quantum phase transition. We interpret the obtained results in terms of a predicted canted antiferromagnetic phase.
authors.affiliation: Institute of Solid State Physics, Chernogolovka, Moscow District 142432, Russia.
authors.forename: V S
authors.initials: VS
authors.lastname: Khrapai
authors.forename: E V
authors.initials: EV
authors.lastname: Deviatov
authors.forename: A A
authors.initials: AA
authors.lastname: Shashkin
authors.forename: V T
authors.initials: VT
authors.lastname: Dolgopolov
authors.forename: F
authors.initials: F
authors.lastname: Hastreiter
authors.forename: A
authors.initials: A
authors.lastname: Wixforth
authors.forename: K L
authors.initials: KL
authors.lastname: Campman
authors.forename: A C
authors.initials: AC
authors.lastname: Gossard