Ultrafast optical currents in gapped graphene

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 sym...

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Bibliographic Details
Published in:Journal of physics. Condensed matter 2020-02, Vol.32 (6), p.065305-065305
Main Authors: Oliaei Motlagh, S Azar, Nematollahi, Fatemeh, Mitra, Aranyo, Zafar, Ahmal Jawad, Apalkov, Vadym, Stockman, Mark I
Format: Article
Language:English
Subjects:
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
current
gapped graphene
graphene
topological resonances
transferred charge
ultrafast electron dynamics
ultrafast laser pulse
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Summary: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.
ISSN:0953-8984
1361-648X
DOI:10.1088/1361-648X/ab4fc7