Photoconductivity Response at Cyclotron-Resonance Harmonics in a Nondegenerate Two-Dimensional Electron Gas on Liquid Helium

We report the first observation of an oscillatory photoconductivity response at the cyclotron-resonance harmonics in a nondegenerate 2D electron system formed on the free surface of liquid helium. The dc conductivity oscillations are detected for electrons occupying the ground surface subband. Their...

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Published in:Physical review letters 2015-12, Vol.115 (25), p.256802-256802, Article 256802
Main Authors: Yamashiro, R, Abdurakhimov, L V, Badrutdinov, A O, Monarkha, Yu P, Konstantinov, D
Format: Article
Language:English
Subjects:
Cyclotrons
Grounds
Harmonics
Inelastic scattering
Liquid helium
Oscillations
Photoconductivity
Two dimensional
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description We report the first observation of an oscillatory photoconductivity response at the cyclotron-resonance harmonics in a nondegenerate 2D electron system formed on the free surface of liquid helium. The dc conductivity oscillations are detected for electrons occupying the ground surface subband. Their period is governed by the ratio of the microwave frequency to the cyclotron frequency. Theoretical analysis of the photoresponse in a strongly interacting electron system indicates that the observation can be explained by an oscillatory correction to the electron distribution function that appears for a large inelastic relaxation time because of photon-assisted scattering.
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subjects Cyclotrons
Grounds
Harmonics
Inelastic scattering
Liquid helium
Oscillations
Photoconductivity
Two dimensional
title Photoconductivity Response at Cyclotron-Resonance Harmonics in a Nondegenerate Two-Dimensional Electron Gas on Liquid Helium
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