The influence of sub-cycle electric field pulse parameters on the excitation spectrum in boron nitride and its model analogues

Abstract

The nonlinear interaction of high-intensity electromagnetic pulses with condensed matter is currently the subject of intense research. Of particular interest is the influence of field pulse parameters on the spectrum of generated excited states. Advances in generating extremely short single-cycle or even sub-cycle pulses have raised the question of the causes of inhomogeneities (bands) in excitation spectra, even in the absence of a carrier in the time dependence of the acting field. Modeling the action of sub-cycle pulses also faces the problem of permissible arbitrariness in determining the explicit form of the pulse's electric field versus time, known as the prohibition on the formation of purely unipolar pulses.
A method based on the quantum kinetic equation has demonstrated the feasibility of modeling the ultrafast electron dynamics of solid-state materials under the action of strong electric fields. This paper presents the results of its use to study the relationship between the shape of short sub-cycle pulses and the spectrum of generated excitations in boron nitride and model media that differ from boron nitride only in their band gap. The possibility of bypassing the ban on unipolar pulses and the results of the used modification of the pulse shape on the excitation spectrum are considered and demonstrated.

Speaker

Anatolii Panferov
Saratov State University, Saratov
Russia

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