Circular polarization immunity of the cyclotron resonance photoconductivity in two-dimensional electron systems

Two-dimensional electron systems (2DES) subjected to a perpendicular magnetic field absorb electromagnetic radiation via cyclotron resonance (CR). Here we report a qualitative deviation from this well-known behavior. Our measurements in large-sized 2DES based on GaAs and HgTe reveal that the CR-enha...

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Bibliographic Details
Main Authors: Monch, E., Euringer, P., Huttner, G.-M., Dmitriev, I. A., Schuh, D., Marocko, M., Mikhailov, N. N., Dvoretsky, S. A., Watanabe, K., Taniguchi, T., Eroms, J., Bougeard, D., Weiss, D., Ganichev, S. D.
Format: Conference Proceeding
Language:English
Subjects:
Magnetic field measurement
Magnetic liquids
Polarization
Temperature dependence
Temperature distribution
Temperature measurement
Two dimensional displays
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Summary:Two-dimensional electron systems (2DES) subjected to a perpendicular magnetic field absorb electromagnetic radiation via cyclotron resonance (CR). Here we report a qualitative deviation from this well-known behavior. Our measurements in large-sized 2DES based on GaAs and HgTe reveal that the CR-enhanced photoconductivity becomes insensitive to the radiation helicity, showing almost the same signal amplitude for both CR active and inactive polarities of B, when the temperature T is lowered to that of liquid helium or below. Strikingly, the simultaneously measured CR in the transmission demonstrates a conventional strong helicity dependence for all T. In contrast similar photoconductivity measurements in graphene show no anomalies indicating an ordinary helicity-sensitivity in the whole investigated temperature range.
ISSN:2162-2035
DOI:10.1109/IRMMW-THz50927.2022.9895950