paper

Multiphoton processes in microwave photoresistance of 2D electron system

arXiv:cond-mat/0512479 · doi:10.1103/PhysRevB.73.041303

Abstract

We extend our studies of microwave photoresistance of ultra-high mobility two-dimensional electron system (2DES) into the high-intensity, non-linear regime employing both monochromatic and bichromatic radiation. Under high-intensity monochromatic radiation we observe new zero-resistance states (ZRS) which correspond to rational values of ( is the cyclotron frequency) and can be associated with multiphoton processes. %Formation of these rational ZRS is accompanied by a dramatic reconstruction of the photoresistance spectrum which reveals diminishing, narrowing, and phase reduction of the resistance peaks, as well as overall suppression of resistance at . Under bichromatic radiation we discover new resistance minimum, possibly a precursor of bichromatic ZRS, which seems to originate from a frequency mixing process, . These findings indicate that multiphoton processes play important roles in the physics of non-equilibrium transport of microwave-driven 2DES, and suggest new directions for theoretical and experimental studies.

4.5 pages, 3 figures

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