We theoretically explore the optical properties of a bulk Rashba conductor by calculating the transport coefficients at
finite frequencies. It is demonstrated that the combination of direct and inverse Edelstein effects leads to a softening of
the plasma frequency for the electric field perpendicular to the Rashba field, resulting in a hyperbolic electromagnetic
metamaterial. In the presence of magnetization, a significant enhancement of anisotropic propagation (directional
dichroism) is predicted because of the interband transition edge singularity. On the basis of an effective Hamiltonian
analysis, the dichroism is demonstrated to be driven by toroidal and quadratic moments of the magnetic Rashba system.
The effective theory of the cross-correlation effects has the same mathematical structure as that of insulating
Gen Tatara, "Anomalous optical properties of Rashba conductor (Conference Presentation)," Proc. SPIE 10357, Spintronics X, 103571R (Presented at SPIE Nanoscience + Engineering: August 09, 2017; Published: 21 September 2017); https://doi.org/10.1117/12.2277502.5583430683001.
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