Experimental and numerical exploration of intrinsic localized modes in an atomic lattice |
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Authors: | M Sato A J Sievers |
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Institution: | (1) Graduate School of Natural Science and Technology, Kanazawa University, Kanazawa Ishikawa, 920-1192, Japan;(2) Laboratory of Atomic and Solid State Physics, Cornell University, Ithaca, NY 14853-2501, USA |
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Abstract: | This review focuses attention on the experimental studies of intrinsic localized modes (ILMs) produced in driven atomic lattices.
Production methods involve the application of modulational instability under carefully controlled conditions. One experimental
approach is to drive the atomic lattice far from equilibrium to produce ILMs, the second is to apply a driver of only modest
strength but nearby in frequency to a plane wave mode so that a slow transformation from large amplitude standing waves to
ILMs takes place. Since, in either case, the number of ILMs produced is small, the experimental observation tool appropriate
for this task is four-wave mixing. This nonlinear detection technique makes use of the nonlinearity associated with an ILM
to enhance its signal over that produced by the more numerous, but linear, spin waves. The final topic deals with numerical
simulations of a nonlinear nanoscale atomic lattice where the new feature is running ILMs. |
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Keywords: | Intrinsic localized modes Discrete breathers Nonlinear atomic lattices Modulational instability Nonlinear mode locking |
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