Observation of High Harmonics of the Cyclotron Resonance in Microwave Transmission of a High-Mobility Two-Dimensional Electron System

Abstract

In this supplemental material we provide details of transmittance measurements, additional transmission data for different radiation frequencies, dependence of MIRO and transmittance on the radiation power and dc current, magnetotransport in the absence and presence of radiation, MIRO measurements using double modulation technique, full expression for the MIRO amplitude, summary of the fitting procedure including table of obtained sample parameters, discussion of the low-B decay of oscillations in transmission and MIRO, and conditions for observation of transmittance oscillations in high-mobility 2DES.

Dependences of the Transport Scattering Time and Quantum Lifetime on the Two-Dimensional Electron Gas Density in Modulation-Doped Single GaAs Quantum Wells with AlAs/GaAs Short-Period Superlattice Barriers

“…In this case, in addition to the factor of the spatial separation of the doping and transport regions, electron scattering by the random potential of dopants is further suppressed owing to the screening action of X-valley electrons confined in the AlAs layers [4][5][6][7]. This approach makes it possible to obtain a highmobility 2D electron gas with a high density in a single QW with SPSL barriers, thereby offering new possibilities for experimental studies of the fundamental properties of low-dimensional semiconductor systems [8][9][10][11].…”

“…-1- The investigation of the mechanisms of electron scattering in single GaAs QWs with AlAs/GaAs SPSL barriers is an attractive field of research because the 2D electron gas in these heterostructures can possess a unique combination of parameters such as ne, μ, and the quantum lifetime τq: the density of electrons ne is considerably higher and their mobility μ is considerably lower than they are in modern ultrahigh-mobility heterostructures [3,6,7]. At the same time, although the mobility is not extremely high, the time τq in single QWs with SPSL barriers is quite long, which, in combination with a high density ne, means that fundamental results of general significance can be obtained in these 2D systems [8][9][10][11].…”