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

Details Ground state and excitation spectra of a strongly correlated lattice by the coupled cluster method Ground state and excitation spectra of a strongly correlated lattice by the coupled cluster method

2012-02-16

arxiv.org/abs/1202.3537v3

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

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 certain class of probe operators. 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.

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