Polar Kerr effect from a time-reversal symmetry breaking unidirectional charge density wave

Martin Gradhand, Ilya Eremin, Johannes Knolle

We analyze the Hall conductivity ${\sigma }_{xy}(\omega )$ of a charge ordered state with momentum $\mathbf{Q}=(0,2Q)$ and calculate the intrinsic contribution to the Kerr angle ${\Theta }_K$ using the…