Anisotropic and tunable optical conductivity of a two-dimensional semi-Dirac system in the presence of elliptically polarized radiation

TL;DR

This study explores how elliptically polarized light influences the anisotropic optical conductivity of a 2D semi-Dirac system, revealing tunable optoelectronic properties relevant for infrared and terahertz applications.

Contribution

It demonstrates the impact of ellipticity ratio, temperature, and carrier density on optical conductivity, highlighting the tunability of 2D semi-Dirac systems for optoelectronic devices.

Findings

Anisotropic optical absorption in xx and yy directions.

Ellipticity ratio and other parameters can tune conductivity spectrum.

Potential for 2D semi-Dirac systems in infrared and terahertz devices.

Abstract

We investigate the effect of ellipticity ratio of the polarized radiation field on optoelectronic properties of a two-dimensional (2D) semi-Dirac (SD) system. The optical conductivity is calculated within the energy balance equation approach derived from the semiclassical Boltzmann equation. We find that there exists the anisotropic optical absorption induced via both the intra- and interband electronic transition channels in the perpendicular $xx$ and $yy$ directions. Furthermore, we examine the effects of the ellipticity ratio, the temperature, the carrier density, and the band-gap parameter on the optical conductivity of the 2D SD system placed in transverse and vertical directions, respectively. It is shown that the ellipticity ratio, temperature, carrier density, and band-gap parameter can play the important roles in tuning the strength, peak position, and shape of the optical conductivity spectrum. The results obtained from this study indicate that the 2D SD system can be a promising anisotropic and tunable optical and optoelectronic material for applications in innovative 2D optical and optoelectronic devices, which are active in the infrared and terahertz bandwidths.