title: Zero-differential resistance state of two-dimensional electron systems in strong magnetic fields.
abstract: We report the observation of a zero-differential resistance state (ZDRS) in response to a direct current above a threshold value I>I th applied to a two-dimensional system of electrons at low temperatures in a strong magnetic field. Entry into the ZDRS, which is not observable above several Kelvins, is accompanied by a sharp dip in the differential resistance. Additional analysis reveals an instability of the electrons for I>I th and an inhomogeneous, nonstationary pattern of the electric current. We suggest that the dominant mechanism leading to the new electron state is a redistribution of electrons in energy space induced by the direct current.
authors.affiliation: Physics Department, City College of the City University of New York, New York 10031, USA.
authors.forename: A A
authors.initials: AA
authors.lastname: Bykov
authors.forename: Jing-qiao
authors.initials: JQ
authors.lastname: Zhang
authors.forename: Sergey
authors.initials: S
authors.lastname: Vitkalov
authors.forename: A K
authors.initials: AK
authors.lastname: Kalagin
authors.forename: A K
authors.initials: AK
authors.lastname: Bakarov