Dynamical density correlation function of one-dimensional Mott insulators in a magnetic field
Davide Controzzi, Fabian H. L. Eßler
We consider the one-dimensional extended Hubbard model at half filling in the presence of a magnetic field. Using field theory techniques we calculate the dynamical density-density correlation function ${\ensuremath{\chi}}_{\mathrm{nn}}(\ensuremath{\omega},q)$ in the low-energy limit. When excitons are formed, a singularity appears in ${\ensuremath{\chi}}_{\mathrm{nn}}(\ensuremath{\omega},q)$ at a particular energy and momentum transfer.
arXiv:cond-mat/0204594•Physical review. B, Condensed matter•Oct 29, 2002•18 citations