Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2005-12-19
Phys. Rev. B 73, 041303(R) (2006)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
4.5 pages, 3 figures
Scientific paper
10.1103/PhysRevB.73.041303
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 $\omega$ we observe new zero-resistance states (ZRS) which correspond to rational values of $\epsilon=\omega/\omega_C$ ($\omega_C$ 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 $\epsilon<1/2$. Under bichromatic radiation $\omega_1,\omega_2$ we discover new resistance minimum, possibly a precursor of bichromatic ZRS, which seems to originate from a frequency mixing process, $\omega_1+\omega_2$. 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.
Du Rui-Rui
Pfeiffer Loren N.
West Ken. W.
Zudov M. A.
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