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.
Highlights
The availability of ultrashort laser pulses with the duration of a few femtoseconds provides effective tools to manipulate and study the electron dynamics in solids at ultrafast time scale with high temporal resolution[1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21]
One of such materials is a monolayer of transition metal dichalcogenides (TMDCs) that has a direct bandgap with nonzero Berry curvature around the K and K valleys
Sublattices A and B are unequivalent, which results in broken inversion symmetry
Summary
The availability of ultrashort laser pulses with the duration of a few femtoseconds provides effective tools to manipulate and study the electron dynamics in solids at ultrafast time scale with high temporal resolution[1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21]. To find the coherent electron dynamics in gapped graphene we solve time-dependent Schrodinger equation (TDSE) If the linear optical pulse is polarized along the y-axis, the CB population distribution in the reciprocal space is symmetric with respect to the y-axis and the electric current is generated only along the yaxis, and not along the x-axis.
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