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APS » Journals » Phys. Rev. B » Volume 54 » Issue 24
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Phys. Rev. B 54, R17269–R17272 (1996)

Dynamical density-density correlations in one-dimensional Mott insulators

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Walter Stephan and Karlo Penc*
Max-Planck-Institut für Physik Komplexer Systeme, Bayreuther Strasse 40, D-01187 Dresden, Germany

Received 11 September 1996; published in the issue dated 15 December 1996

The dynamical density-density correlation function is calculated for the one-dimensional, half-filled Hubbard model extended with nearest-neighbor repulsion using the Lánczos algorithm for finite-size systems and analytically for large on-site repulsion compared to hopping amplitudes. At the zone boundary an excitonic feature exists for any finite nearest-neighbor repulsion and exhausts most of the spectral weight, even for parameters where no exciton is visible at zero momentum.

© 1996 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.54.R17269
DOI:
10.1103/PhysRevB.54.R17269

*On leave from the Research Institute for Solid State Physics, Budapest, Hungary.

 
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