Ultrafast optical currents in gapped graphene
Mesoscale and Nanoscale Physics
2019-08-27 v1
Abstract
We study theoretically the interaction of ultrashort optical pulses with gapped graphene. Such strong pulse results in finite conduction band population and corresponding electric current both during and after the pulse. Since gapped graphene has broken inversion symmetry, it has an axial symmetry about the -axis but not about the -axis. We show that, in this case, if the linear pulse is polarized along the -axis, the rectified electric current is generated in the direction. At the same time, the conduction band population distribution in the reciprocal space is symmetric about the -axis. Thus, the rectified current in gapped graphene has inter-band origin, while the intra-band contribution to the rectified current is zero.
Cite
@article{arxiv.1908.09019,
title = {Ultrafast optical currents in gapped graphene},
author = {S. Azar Oliaei Motlagh and Fatemeh Nematollahi and Aranyo Mitra and Ahmal Jawad Zafar and Vadym Apalkov and Mark I. Stockman},
journal= {arXiv preprint arXiv:1908.09019},
year = {2019}
}