Nonlinear regimes of the resonant acoustic transparency for longitudinal–transverse elasticwaves in low-temperature paramagnetic crystals

Abstract

Nonlinear propagation of longitudinal–transverse acoustic pulses in the system of resonantparamagnetic impurities is theoretically investigated. It is shown that, under a largetransverse pulse component and propagation along an external magnetic field, a regime ofacoustic self-induced transparency is realized. A new soliton mode, following by reductionin the propagation velocity, similar to the case of self-induced transparency is realized inthe opposite limit. Then, however, populations of the quantum Zeeman sublevels staypractically unchanged and the transverse component of the pulse suffers phase modulation.