In the Jahn-Teller-Hubbard molecule, conventional quadrupoles vanish but composite two-body electron-phonon quadrupoles emerge that are selection-rule decoupled from them, and the ground-state entanglement involves phonon angular momenta L_ph=2,3 superposed with electron L=1,2 states.
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A two-photon resonant process in the driven Hubbard-like model of K3C60 produces enhanced pair correlations whose resonance frequency scales downward with cluster size, supporting an electronic origin for the observed 10 THz light-induced response.
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Spherical-tensor description of the Jahn--Teller--Hubbard molecule and local electron--phonon entanglement
In the Jahn-Teller-Hubbard molecule, conventional quadrupoles vanish but composite two-body electron-phonon quadrupoles emerge that are selection-rule decoupled from them, and the ground-state entanglement involves phonon angular momenta L_ph=2,3 superposed with electron L=1,2 states.
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Microscopic mechanism for resonant light-enhanced pair correlations in K$_3$C$_{60}$
A two-photon resonant process in the driven Hubbard-like model of K3C60 produces enhanced pair correlations whose resonance frequency scales downward with cluster size, supporting an electronic origin for the observed 10 THz light-induced response.