Dynamic conductivity of doped graphene in post-linear response

TL;DR

This paper investigates the nonlinear optical conductivity of doped graphene, revealing how strong electric fields influence current saturation, transparency, and the effects of temperature and chemical potential on these properties.

Contribution

It provides a theoretical analysis of doped graphene's nonlinear conductivity beyond linear response, including new dependencies on frequency, amplitude, temperature, and chemical potential.

Findings

Saturation of induced currents at high electric fields.

Nonlinear increase of optical transparency with wave intensity.

Transmission coefficient decreases with higher chemical potential and temperature.

Abstract

The interband and intraband conductivities of doped graphene were theoretically investigated beyond the linear response. The new dependences of induced currents on frequency and amplitude of external electric field, the graphene temperature and chemical potential were determined for sufficiently strong electric fields in the resonant approximation. Particularly, the saturation of induced currents and the non-linear increase of optical transparency with wave intensity growth were obtained for arbitrary temperatures and doped situation. As contrasted to increase for the interband transitions at fixed intensity, the transmission coefficient of intraband mechanism decreases with rise of the chemical potential and temperature.