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Pierre-Francois Loos 2020-12-01 14:50:57 +01:00
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Manuscript/EPAWTFT.tex
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@ -1405,7 +1405,7 @@ This swapping process can also be represented as a double excitation, and thus a
for $\lambda \geq 1$ (Fig.~\ref{subfig:ump_cp}). for $\lambda \geq 1$ (Fig.~\ref{subfig:ump_cp}).
While this appears to be an avoided crossing between the ground and first-excited state, While this appears to be an avoided crossing between the ground and first-excited state,
the presence of an earlier excited-state avoided crossing means that the first-excited state qualitatively the presence of an earlier excited-state avoided crossing means that the first-excited state qualitatively
represents the reference double excitation for $\lambda > 0.5.$ represents the reference double excitation for $\lambda > 1/2$ (see Fig.~\ref{subfig:ump_cp}).
% SHARPNESS AND QPT % SHARPNESS AND QPT
The ``sharpness'' of the avoided crossing is controlled by the correlation strength $U/t$. The ``sharpness'' of the avoided crossing is controlled by the correlation strength $U/t$.