Observation of High Harmonics of the Cyclotron Resonance in Microwave Transmission of a High-Mobility Two-Dimensional Electron System
arXiv:2008.11114 · doi:10.1103/PhysRevResearch.3.L012013
Abstract
We report an observation of magnetooscillations of the microwave power transmitted through the high mobility two-dimensional electron system hosted by a GaAs quantum well. The oscillations reflect an enhanced absorption of radiation at high harmonics of the cyclotron resonance and follow simultaneously measured microwave-induced resistance oscillations (MIRO) in the dc transport. While the relative amplitude (up to 1%) of the transmittance oscillations appears to be small, they represent a significant (>50%) modulation of the absorption coefficient. The analysis of obtained results demonstrates that the low-B decay, magnitude, and polarization dependence of the transmittance oscillations accurately follow the theory describing photon-assisted scattering between distant disorder-broadened Landau levels. The extracted sample parameters reasonably well describe the concurrently measured MIRO. Our results provide an insight into the MIRO polarization immunity problem and pave the way to probe diverse high-frequency transport properties of high-mobility systems using precise transmission measurements.
arXiv commentManuscript (7 pages, 1 figure) and Supplemental Material (12 pages, 9 figures)
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- Demonstration of high sensitivity of microwave-induced resistance oscillations to circular polarization
- Circular polarization immunity of the cyclotron resonance photoconductivity in two-dimensional electron systems
- Low-energy excitations in multiple modulation-doped CdTe/(CdMg)Te quantum wells
- Strongly nonlinear Bernstein modes in graphene reveal plasmon-enhanced near-field magnetoabsorption