Physics – Condensed Matter – Materials Science
Scientific paper
2000-08-23
Phys. Rev. B 62, 11460 (2000)
Physics
Condensed Matter
Materials Science
20 pages, 7 eps figures. Accepted, Phys. Rev. B
Scientific paper
10.1103/PhysRevB.62.11460
Using an efficient optimal control scheme to determine the exciting fields, we theoretically demonstrate the optical creation of vibrational intrinsic localized modes (ILMs) in anharmonic perfect lattices with realistic interatomic potentials. For systems with finite size, we show that ILMs can be excited directly by applying a sequence of femtosecond visible laser pulses at THz repetition rates. For periodic lattices, ILMs can be created indirectly via decay of an unstable extended lattice mode which is excited optically either by a sequence of pulses as described above or by a single picosecond far-infrared laser pulse with linearly chirped frequency. In light of recent advances in experimental laser pulse shaping capabilities, the approach is experimentally promising.
Page J.-B.
Roessler T.
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