Creation of particle-hole superposition states in graphene at multiphoton resonant excitation by laser radiation

TL;DR

This paper investigates how multiphoton resonant laser excitation can create electron-hole superposition states in graphene, analyzing the dynamics of Rabi oscillations and their dependence on various parameters.

Contribution

It introduces a theoretical model for electron-hole superpositions in graphene under multiphoton excitation, including calculations of the density matrix and Rabi oscillations.

Findings

Rabi oscillations depend on time, momentum, and photon number.

The density matrix approach captures the nonlinear dynamics.

Multiphoton processes enable coherent superpositions in graphene.

Abstract

Nonlinear dynamics of establishment of electron-hole coherent superpositions states in graphene by multiphoton resonant excitation of interband transitions in laser fields is considered. The single-particle time dependent density matrix for such a quantized system is calculated in the multiphoton resonant approximation. The dependence of Rabi oscillations of Fermi-Dirac sea in graphene on the time, momentum, and photon number at multiphoton laser-excitation is analyzed.