Lopez, Alexander and Scholz, Andreas and Santos, Benjamin and Schliemann, John (2015) Photoinduced pseudospin effects in silicene beyond the off-resonant condition. PHYSICAL REVIEW B, 91 (12): 125105. ISSN 1098-0121, 1550-235X
Full text not available from this repository. (Request a copy)Abstract
We study the photoinduced manipulation of charge carriers in monolayer silicene subject to intense electromagnetic terahertz radiation. Considering the Dirac cone approximation and going beyond the off-resonant condition for large frequencies of the radiation field, where only virtual photon processes are allowed, we present the exact zero-momentum pseudospin polarization and numerical results for the quasienergy band structure and time-averaged density of states. We find that resonant processes, due to real photon emission and absorbtion processes, induce a band inversion that qualitatively modifies the quasienergy spectrum. These band-structure changes manifest themselves as an inversion of the averaged pseudospin polarization. Through the analysis of the time-averaged density of states we find that effective photoinduced gap manipulation can only be achieved in the intermediate and strong matter-radiation coupling regime where the off-resonant approximation breaks down.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | TOPOLOGICAL INSULATORS; BERRYS PHASE; GRAPHENE; MAGNUS; SPIN; CONVERGENCE; FIELDS; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics > Chair Professor Grifoni > Group John Schliemann |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 22 Jul 2019 14:24 |
| Last Modified: | 22 Jul 2019 14:24 |
| URI: | https://pred.uni-regensburg.de/id/eprint/5812 |
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