Effect of carrier heating on diffusion induced modulational instability in semiconductor plasmas

Abstract

The purpose of the present paper is to report the study on modulational amplification in diffusive semiconductors including hot carrier effects. Considering that the origin of modulational interaction lies in the third-order optical susceptibility c (3) arising from the nonlinear diffusion current density and using coupled mode theory, an analytical investigation of frequency modulational interaction between co-propagating laser beams and internally generated acoustic mode is presented. We have studied the steady state and transient amplification characteristics of modulated waves arising in diffusive semiconductor plasmas. The effect of carrier heating adds new dimensions to the present study. The heating effect reduces the required threshold amplitude of wave and enhances steady-state as well as transient gain of the generated acoustic mode.Keywords : High-field and nonlinear effects (Hot carrier), nonlinear phenomena : waves, wave propagation, and other interactions (including parametric effects, mode coupling, ponderomotive effects, etc.), diffusion in solids, Piezo-, elasto-, and acousto-optical effects.

Polaron-induced parametric interactions in semiconductors: influence of band nonparabolicity and carrier heating

“…Inclusion of appropriate collision mechanisms, the effect of Hall field and nonparabolicity of the conduction band have shown the ways to more realistic studies on convective instability [22]. Refinement effects arise from the carrier heating by high-intensity pump in high-mobility semiconductors captured the interest of researchers [23,24]. Reasonably, good transparency of medium with a large amplification of third harmonic and attenuation of the pump has been reported while studying influence of magnetic field on the optical parameters [24].…”

“…Refinement effects arise from the carrier heating by high-intensity pump in high-mobility semiconductors captured the interest of researchers [23,24]. Reasonably, good transparency of medium with a large amplification of third harmonic and attenuation of the pump has been reported while studying influence of magnetic field on the optical parameters [24]. Recently, effect of hot carriers on amplitude modulation and demodulation of an electromagnetic wave [25] and frequency modulational instability in semiconductor plasmas has been studied [26].…”

“…Reasonably, good transparency of medium with a large amplification of third harmonic and attenuation of the pump has been reported while studying influence of magnetic field on the optical parameters [24]. Recently, effect of hot carriers on amplitude modulation and demodulation of an electromagnetic wave [25] and frequency modulational instability in semiconductor plasmas has been studied [26]. In a recent work, presence of superthermal electrons is found to modify conditions for the occurrence of modulational instability as well as threshold and growth rate [27] in magnetized plasma.…”

“…Enhancement in the dispersion and gain profiles has been reported while studying parametric interaction (PI) in acousto-optical semiconductors in presence of hot carriers [24]. In polar semiconductors, highly excited electrons transfer their energy to the crystal lattice primarily by emission of longitudinal optical (LO) phonons [28].…”

Effects of energy bias and s-wave scattering length on tunneling dynamics of Fermi superfluid gases in a double-well

“…It is possible to study the dynamics of many-body quantum states for bosons [1][2][3][4][5][6][7], fermions [8][9][10][11][12] and Bose-Fermi mixture [13] by controlling the confined ultracold atomic gases. Especially, double-well potential gives us opportunity to investigate important quantum effects [14][15][16], such as Josephson oscillation [17][18][19][20][21][22][23][24], Landau-Zener tunneling [25,26], Rosen-Zener tunneling [9,27,28], etc.…”