Comment on “Berry phase mechanism for optical gyrotropy in stripe-ordered cuprates”
Comment on “Berry phase mechanism for optical gyrotropy in stripe-ordered cuprates”
I comment on two recent papers on Kerr effect as evidence of gyrotropic order in cuprates, and I suggest that the arguments may not be sound. The difficulty is that in practically all cases the wave vector $k_{z}$ perpendicular to the copper-oxygen plane is not a good quantum number. This …