Abstract
We present a detailed theoretical investigation of the radiation induced giantmagnetoresistance oscillations recently discovered in high-mobility two-dimensional electrongas. Electron interactions with impurities, and transverse and longitudinal acousticphonons in GaAs-based heterosystems are considered simultaneously. Multiphoton-assistedimpurity scatterings are shown to be the primary origin of the resistance oscillation.Based on the balance-equation theory developed for magnetotransport in Faradaygeometry, we are able not only to reproduce the observed period, phase and thenegative resistivity of the main oscillations, but also to predict the secondarypeak/valley structures relating to two-photon and three-photon processes. Thedependence of the magnetoresistance oscillation on microwave intensity, the role ofdc bias current and the effect of elevated electron temperature are discussed.Furthermore, we propose that the temperature dependence of the resistance oscillationstems from the growth of the Landau level broadening due to the enhancement ofacoustic phonon scattering with increasing lattice temperature. The calculatedtemperature variation of the oscillation agrees well with experimental observations.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
