Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2012-01-30
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
8 pages, 3 figures
Scientific paper
We study a plasma instability in semiconductor superlattices irradiated by a monochromatic, pure AC electric field. The instability leads to sustained oscillations at a frequency \omega 2 that is either incommensurate to the drive, or frequency-locked to it, \omega 2 = (p/q) \omega. A spontaneously generated DC bias is found when either p or q in the locking ratio are even integers. Frequency locked regions form Arnol'd tongues in parameter space and the ratio \omega 2 / \omega\ exhibits a Devil's staircase. A transition to chaotic motion is observed as resonances overlap.
Alekseev Kirill N.
Isohätälä Jukka
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