Orbital momentum excitation by interband optical transitions in a 2D system illuminated by twisted light

TL;DR

This paper investigates how twisted light affects orbital momentum excitation in a 2D system, deriving generation rates and the mean orbital momentum through kinetic equations for interband transitions.

Contribution

It introduces a theoretical framework for analyzing orbital momentum excitation in 2D systems under twisted light illumination, focusing on interband transitions.

Findings

Derived generation rates of electron orbital momentum.

Formulated and solved a kinetic equation for orbital momentum distribution.

Calculated the mean electron orbital momentum.

Abstract

Illumination of a two-dimensional system by a twisted light beam is considered in order to find specific effects caused by twisting. Direct interband transitions between the valence and conduction bands are supposed. The generation rates of the electron orbital momentum is found. A kinetic equation for an orbital momentum distribution function is formulated and solved. The mean electron orbital momentum is found.