Driven electronic states at the surface of a topological insulator
Name
Fregoso-2013-Driven electronic states.pdf
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1.29 MB
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Author(s)
Fregoso, Benjamin M.
Wang, Y. H.
Galitski, Victor
Gedik, Nuh
Date Issued
October 2013
Journal
Physical Review B
Publisher
American Physical Society
Citation
Fregoso, Benjamin M., Y. H. Wang, N. Gedik, and Victor Galitski. “Driven Electronic States at the Surface of a Topological Insulator.” Phys. Rev. B 88, no. 15 (October 2013). © 2013 American Physical Society
Version
Final published version
Abstract
Motivated by recent photoemission experiments on the surface of topological insulators we compute the spectrum of driven topological surface excitations in the presence of an external light source. We completely characterize the spectral function of these nonequilibrium electron excitations for both linear and circular polarizations of the incident light. We find that in the latter case, the circularly polarized light gaps out the surface states, whereas linear polarization gives rise to an anisotropic metal with multiple Dirac cones. We compare the sizes of the gaps with recent pump-probe photoemission measurements and find good agreement. We also identify theoretically several new features in the time-dependent spectral function, such as shadow Dirac cones.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1103/PhysRevB.88.155129
