Ultrafast Valley polarization in gapped graphene
ORAL
Abstract
We study numerically the ultrafast valley polarization in gapped graphene that can be accessed and controlled by a single cycle of a circularly polarized intense pulse. The amplitude of the pulse is about 0.5 V/\AA and its duration is 5 fs. Depending on the polarization of the pulse, right or left handed, one valley, K or Kâ, is significantly populated, resulting in significant residual valley polarization of gapped graphene. The unequal valley population in the reciprocal space is due to topological resonance, which is caused by the mutual cancellation of the topological and dynamic phases. The ultrafast valley polarization, generated in gapped graphene-like materials, can be used in ultrafast quantum memory devices.
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Presenters
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Seyyedeh Azar Oliaeimotlagh
Georgia State University
Authors
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Seyyedeh Azar Oliaeimotlagh
Georgia State University
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Vadym Apalkov
Georgia State University
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Mark I Stockman
Georgia State University