2013/03/31 by Sergey S. Pershoguba, Kostyantyn Kechedzhi, Victor M. Yakovenko · 2 citations
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Condensed matter physics #Cuprate #Dielectric #Ferroelectricity #Kerr effect #Loop (graph theory) #Magnetic and transport properties of perovskites and related materials #Magnetic moment #Magnetoelectric effect #Multiferroics #Physics #Physics of Superconductivity and Magnetism #Point reflection #Polar #Pseudogap #Quantum mechanics #Superconductivity #Symmetry breaking #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevlett.111.047005
published as Phys. Rev. Lett. 111, 047005 (2013) · 5 pages, 3 figures; Supplemental Material added; corresponds to the published version
arxiv created 2013/07/25 · openalex publication_date 2013/07/25 · arxiv updated 2013/07/26 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We propose a novel chiral order parameter to explain the unusual polar Kerr effect in underdoped cuprates. It is based on the loop-current model by Varma, which is characterized by the in-plane anapole moment N and exhibits the magnetoelectric effect. We propose a helical structure where the vector N(n) in the layer n is twisted by the angle π/2 relative to N(n-1), thus breaking inversion symmetry. We show that coupling between magnetoelectric terms in the neighboring layers for this structure produces optical gyrotropy, which results in circular dichroism and the polar Kerr effect.