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Title: Ultrafast optical currents in gapped graphene

Journal Article · · Journal of Physics. Condensed Matter

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.

Sponsoring Organization:
USDOE
Grant/Contract Number:
FG02-01ER15213
OSTI ID:
1573114
Journal Information:
Journal of Physics. Condensed Matter, Journal Name: Journal of Physics. Condensed Matter Journal Issue: 6 Vol. 32; ISSN 0953-8984
Publisher:
IOP PublishingCopyright Statement
Country of Publication:
United Kingdom
Language:
English

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