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- Seitenbereich
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0738 - 0754
- Schlagwort(e)
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<KWD><i>t - t´ - J</i> model
Hole spectral function
Spin waves
- Zusammenfsg.
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The coupling of antiferromagnetic spin excitations and propagating holes has been studied theoretically on a square lattice in order to investigate the dependence of antiferromagnetic order on hole doping, being of relevance, e.g., for the Cu - 3 <I>d</I><sup>9</sup> system in antiferromagnetic CuO<sub>2</sub>-planes of high-<I>T<sub>c</sub></I> superconductors. An effective Hamiltonian has been used, which results from a 2D Hubbard model (hopping integral <I>t</I>) with holes and with strong on-site Coulomb repulsion <I>U</I>. Bare antiferromagnetic excitations and holes with energies of the same order of magnitude <I>t</I><sup>2</sup>/<I>U</I> are interacting via a coupling term being proportional to <I>t</I> and allowing holes to hop by emitting and absorbing spinwaves. In terms of a self-consistent one-loop approximation the renormalization of the spectral function both of holes and antiferromagnetic spin excitations are calculated.
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- Forschungsartikel