1202.3537 (Alessandro Mirone)

Ground state and excitation spectra of a strongly correlated lattice by
the coupled cluster method    [PDF]

Alessandro Mirone

We apply Coupled Cluster Method to a strongly correlated lattice and develop
the Spectral Coupled Cluster equations by finding an approximation to the
resolvent operator, that gives the spectral response for an arbitrary probe
operator. We apply the method to a $MnO_2$ plane model with a parameters choice
which corresponds to previous experimental works and which gives a non-nominal
symmetry ground state.
We show that this state can be observed using our Spectral Coupled Cluster
Method by probing the Coupled Cluster solution obtained from the nominal
reference state. In this case one observes a negative energy resonance which
corresponds to the true ground state.

View original: http://arxiv.org/abs/1202.3537