Polar Kerr effect from chiral-nematic charge order

Abstract

We analyze the polar Kerr effect in an itinerant electron system on a square lattice in the presence of a composite charge order proposed for the pseudogap state in underdoped cuprates. This composite charge order preserves discrete translational symmetries, and is "chiral-nematic" in the sense that it breaks time-reversal symmetry, mirror symmetries in $x$ and $y$ directions, and $C_4$ lattice rotation symmetry. The Kerr angle ${\theta }_K$ in $C_4$-symmetric system is proportional to the antisymmetric component of the anomalous Hall conductivity ${\sigma }_{xy}-{\sigma }_{yx}$. We show that this result holds when $C_4$ symmetry is broken. We show that in order for ${\sigma }_{xy}$ and ${\sigma }_{yx}$ to be non-zero the mirror symmetries in $x$ and $y$ directions have to be broken, and that for ${\sigma }_{xy}-{\sigma }_{yx}$ to be non-zero time-reversal symmetry has to be broken. The chiral-nematic charge order satisfies all these conditions, such that a non-zero signal in a polar Kerr effect experiment is symmetry allowed. We further show that to get a non-zero ${\theta }_K$ in a one-band spin-fluctuation scenario, in the absence of disorder, one has to extend the spin-mediated interaction to momenta away from $(\pi ,\pi )$ and has to include particle-hole asymmetry. Alternatively, in the presence of disorder one can get a non-zero ${\theta }_K$ from impurity scattering: either due to skew scattering (with non-Gaussian disorder) or due to particle-hole asymmetry in case of Gaussian disorder. The impurity analysis in our case is similar to that in earlier works on Kerr effect in $p_x+i{p}_y$ superconductor, however in our case the magnitude of ${\theta }_K$ is enhanced by the flattening of the Fermi surface in the "hot" regions which mostly contribute to charge order.

arXiv comment16 pages, 6 figures, replaced with published version

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