title: Random flips of electric field in microwave-induced states with spontaneously broken symmetry.
abstract: In a two-dimensional electron system subject to microwaves and a magnetic field, photovoltages emerge. They can be separated into two components originating from built-in electric fields and electric field domains arising from spontaneous symmetry breaking. The latter occurs in the zero resistance regime only and manifests itself in pulsed behavior, synchronous across the sample. The pulses show sign reversal. This implies a flip of the field in each domain, consistent with the existence of two equally probable electric field domain configurations due to the spontaneous symmetry breaking.
authors.affiliation: Institute of Solid State Physics, Chernogolovka, Moscow District 142432, Russia.
authors.forename: S I
authors.initials: SI
authors.lastname: Dorozhkin
authors.affiliation: Department of Physics, Weizmann Institute of Science, 76100 Rehovot, Israel.
authors.forename: V
authors.initials: V
authors.lastname: Umansky
authors.affiliation: Bell Laboratories, Lucent Technologies, Murray Hill, New Jersey 07974, USA.
authors.forename: L N
authors.initials: LN
authors.lastname: Pfeiffer
authors.affiliation: Bell Laboratories, Lucent Technologies, Murray Hill, New Jersey 07974, USA.
authors.forename: K W
authors.initials: KW
authors.lastname: West
authors.affiliation: Bell Laboratories, Lucent Technologies, Murray Hill, New Jersey 07974, USA.
authors.forename: K
authors.initials: K
authors.lastname: Baldwin
authors.affiliation: Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, D-70569 Stuttgart, Germany.
authors.forename: K
authors.initials: K
authors.lastname: von Klitzing
authors.affiliation: Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, D-70569 Stuttgart, Germany.
authors.forename: J H
authors.initials: JH
authors.lastname: Smet