Experimental Study of the Infrared and MM-Wave Dynamics of Nonlinear Solid State Systems

摘要

It has been realized for decades that spatially localized modes can occur in purely harmonic lattices only when disorder is introduced so that the translational invariance of the underlying lattice is broken. In recent years it has been noted that some vibrations in perfectly periodic lattices containing both nonlinearity and discreteness appear to localize and the study of this intrinsic localization in various nonlinear periodic lattices is proving quite fruitful. Recently, this earlier work has been formalized in terms of a number of useful existence and stability criteria, and many physically exciting contexts are currently emerging - in nonlinear lattice dynamics (including fracture and friction), magnetic systems, molecular crystals, electron-phonon and magnon-phonon systems, structural biology, and nonlinear optics. The potential for these self-localized oscillatory excitations in equilibrium and nonequilibrium classical and quantum discrete lattices is now extensive and such nonlinear condensed matter research has become our major activity.