Journal
PHYSICAL REVIEW B
Volume 89, Issue 8, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.89.087101
Keywords
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Funding
- Direct For Mathematical & Physical Scien [1004520] Funding Source: National Science Foundation
- Division Of Materials Research [1004520] Funding Source: National Science Foundation
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I comment on two recent papers on the 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 appears to be problematic for Orenstein and Moore [Phys. Rev. B 87, 165110 (2013)], whereas, in Hosur et al. [Phys. Rev. B 87, 115116 (2013)], the symmetry arguments may turn out to be robust, but the microscopic picture is wanting. Thus, the Kerr effect in cuprates remains a puzzle as there is little doubt that the arguments presented against time-reversal symmetry breaking appear to be rather strong on experimental grounds in both of these papers.
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