Laser pulse waveform control of Dirac fermions in graphene

TL;DR

This paper theoretically investigates how ultrafast laser pulses with varying waveforms influence the dynamics of Dirac fermions in graphene, revealing control mechanisms for ultrafast electric currents and charge transfer.

Contribution

It introduces a theoretical framework for understanding how pulse waveform and carrier-envelope phase affect Dirac fermion dynamics in graphene.

Findings

Ultrafast pulse waveform controls Dirac fermion behavior.

Carrier-envelope phase significantly influences induced currents.

Finite charge transfer depends on pulse waveform.

Abstract

We theoretically study the Dirac fermion dynamics in a graphene monolayer in the presence of an applied ultrafast laser pulse. The pulse has the duration of a few femtoseconds and the amplitude of ~ 0.1 - 0.5 $\mathrm{V/\AA}$. The waveform of the pulse is described by Hermit Gaussian polynomials with varying carrier-envelope phase. We show that the ultrafast dynamics of Dirac fermions strongly depends on the carrier-envelope phase and the frequency of the applied pulse. The ultrafast pulse generates an electric current which results in a finite transferred charge. The ultrafast field-driven current and the corresponding net transferred charge depend on the waveform of the applied pulse. Our results pave the way for the development of ultrafast information processing in the terahertz domain.