Volume 126, Number 5, June 2019
|Number of page(s)||7|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||08 July 2019|
Self-oscillations and noise-induced flips of spontaneous electric field in microwave-induced zero resistance state
Department of Physics, University of Regensburg - 93040 Regensburg, Germany and Ioffe Physical Technical Institute - 194021 St. Petersburg, Russia
Received: 24 May 2019
Accepted: 20 June 2019
Experiments demonstrate that microwave illumination of a two-dimensional electron system in a perpendicular magnetic field can produce a state with vanishingly small dissipative response at low frequency. Such zero resistance state is attributed to the spontaneous formation of static electrical domains in an unstable uniform system with negative absolute conductivity. We show that the electrostatic coupling of this system to a weakly conducting doping layer leads to additional dynamic instabilities. In particular, the two-layer system can develop a limit cycle where the domain electric field periodically flips in time. The proposed model provides a natural explanation for quasiperiodic flips of internal spontaneous voltages observed in recent experiments.
PACS: 73.50.-h – Electronic transport phenomena in thin films / 73.50.Fq – High-field and nonlinear effects / 64.60.Ht – Dynamic critical phenomena
© EPLA, 2019
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