Magnon Raman spectra in the half-filled two-dimensional Hubbard model are calculated by using the exact diagonalization of a X/-8 x v'-8 lattice. Theoretical results of the peak positions and relative intensities of the B~, A~ and B 2 spectra agree with the observed ones. The frequency dependence of
Raman scattering in unconventional superconductors: Vertex corrections in the Hubbard and Coulomb models
β Scribed by D. Manske; C. T. Rieck; D. Fay
- Publisher
- Springer US
- Year
- 1996
- Tongue
- English
- Weight
- 237 KB
- Volume
- 105
- Category
- Article
- ISSN
- 0022-2291
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π SIMILAR VOLUMES
The vertex corrections of the dynamical spin susceptibility are calculated for a Hubbard model with intermediate coupling strength (U/t --7) and a Fermi surface approximating that of YBa2Cu307. The resulting q-dispersion of the coupling J(q) yields below TΒ’ for d~2\_y2-wave pairing a resonant-like p
Two-magnon Raman scattering intensity is obtained for a two-dimensional (2D) spin-1/2 antiferromagnet in presence of hopping (off-diagonal) and on-site (diagonal) disorder. For hopping disorder it is seen that a minute amount of disorder leads to a substantial broadening of the Raman lineshape. Wher