Theory of Excitons in Insulating Cu-Oxide Plane

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dc.creatorZhang, Fu Chun
dc.creatorNg, Kwai-Kong
dc.date1998-04-06
dc.date.accessioned2026-07-07T03:10:17Z
dc.date.available2026-07-07T03:10:17Z
dc.descriptionWe use a local model to study the formation and the structure of the low energy charge transfer excitations in the insulating Cu-O$_2$ plane. The elementary excitation is a bound exciton of spin singlet, consisting of a Cu$^+$ and a neighboring spin singlet of Cu-O holes. The exciton can move through the lattice freely without disturbing the antiferromagnetic spin background, in contrast to the single hole motion. There are four eigen-modes of excitons with different symmetry. The p-wave-like exciton has a large dispersion width. The s-wave-like exciton mixes with p-state at finite momentum, and its dipole transition intensity is strongly anisotropic. The model is in excellent agreement with the electron energy loss spectra in the insulating Sr$_2$CuO$_2$Cl$_2$.
dc.description5 pages, 5 figures and 1 table. Submitted to Phys. Rev. B
dc.identifierhttps://arxiv.org/abs/cond-mat/9804072
dc.identifierhttp://arxiv.org/abs/cond-mat/9804072
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/28190
dc.subjectStrongly Correlated Electrons
dc.titleTheory of Excitons in Insulating Cu-Oxide Plane
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