Microwave photo-excited transport in the GaAs/AlGaAs 2DES
ORAL
Abstract
Collective bulk plasmon excitations of a two dimensional electronic system (2DES) evolve into magnetoplasmons in the presence of a perpendicular magnetic field, with a low frequency cutoff determined by the dispersion relation ωMP = (ωC2 + ωP2)1/2, where the plasmon frequency ωP2 = (ne2 /2εeffεom*)k, with k the plasmon wave vector, and ωc the cyclotron resonance frequency. Studies of narrow Hall bar type GaAs/AlGaAs specimens of width, w, have long ago suggested that localization of the plasmon within the boundaries of the sample can lead to the wave vector selection k = π/w and the observation of the corresponding resonance in magnetotransport under photoexcitation. The observation of zero-resistance states and associated radiation induced magnetoresistance oscillations under microwave/mm-wave/terahertz photoexcitation has brought new interest in the role of the magnetoplasmon, if any, in the ultra high mobility GaAs/AlGaAs 2DES and its interaction with this photo-excited transport phenomena mentioned above. In this study, we re-examine through experiment the role of the magnetoplasmon in the GaAs/AlGaAs magnetotransport and report the results.
*NSF ECCS-1710302, and ARO W911NF-14-2-0076, W911NF-15-1-0433.
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Presenters
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Ramesh Mani
- Physics and Astronomy, Georgia State University
- Department of Physics and Astronomy, Georgia State University, Atlanta, Georgia 30303, USA
- Georgia State University
- Department of Physics and Astronomy, Georgia State University
- Physics & Astronomy, Georgia State University