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Photonic analog of a spin-polarized system with Rashba spin-orbit coupling

by: Vassilios Yannopapas
Physical Review B, Vol. 83 (Mar 2011), 113101, doi:10.1103/physrevb.83.113101  Key: citeulike:11191474

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Abstract

We show that a gyrotropic (chiral) medium supporting a longitudinal-wave excitation exhibits a Dirac point in the corresponding photon dispersion lines. By breaking the time-reversal symmetry in such a medium, the dispersion relation resembles the energy dispersion of a spin-polarized two-dimensional electron gas with Rashba spin-orbit coupling. The resulting split bands of the dispersion relation correspond to nonzero Chern numbers implying the existence of nontrivial topological states of the electromagnetic field.


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