Interaction of few-cycle optical pulses in thin film of topological insulator
Abstract
Interaction of few-cycle optical pulses in thin film of topological insulator
Incoming article date: 10.11.2017The aim of the paper is to investigate the interaction of two such pulses when they propagate through the sample. The urgency of few-cycle pulses study is associated with a large number of possible practical applications in various fields of science and technology (from medicine to the study of ultrafast processes). The modeling of the electromagnetic field evolution based on the Maxwell`s equations supplemented by an equation determining the behavior of the electric current in the system. Electrons were described in the long-wave effective Hamiltonian in the case of low temperatures. As a result of the study, the dependence of the shape of the few-cycle optical pulse on its initial velocity and initial amplitude was revealed. When a pair of few-cycle optical pulses interacts in the film of a topological insulator, several new pulses are formed. After a collision, they begin to propagate fairly stable with conservation of the acquired amplitudes. The effect, associated with the steady spread of pulses after the collision, may be useful in the development of hybrid devices based on the effect of light interaction with electrons of the topological insulator.
Keywords: few-cycle pulses, topological insulator, collision