Ultrafast optical currents in gapped graphene
Abstract
We theoretically study the interaction of ultrashort optical pulses with gapped graphene. Such a strong pulse results in a finite conduction band population and a corresponding electric current, both during and after the pulse. Since gapped graphene has broken inversion symmetry, it has an axial symmetry about the y -axis but not about the x-axis. We show that, in this case, if the linear pulse is polarized along the x-axis, the rectified electric current is generated in the y direction. At the same time, the conduction band population distribution in the reciprocal space is symmetric about the x-axis. Thus, the rectified current in gapped graphene has an inter-band origin, while the intra-band contribution to the rectified current is zero.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Nov 04, 2019
- Source ID
- 10.1088/1361-648x/ab4fc7
Entities
People
- Ahmal Jawad Zafar
- Aranyo Mitra
- Fatemeh Nematollahi
- Mark I Stockman
- Seyyedeh Azar Oliaei Motlagh
- Vadym Apalkov
Organizations
- Air Force Office of Scientific Research
- National Science Foundation
- Office of Naval Research
- United States Department of Energy