Ta2Ni(Se,S)5 exhibits strong long-wavelength electron-phonon coupling with g/ω0 ~10 in the normal state, indicating the phase transition is driven by interband coupling rather than pure excitonic insulation.
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Strong long-wavelength electron-phonon coupling in Ta$_2$Ni(Se,S)$_5$
Ta2Ni(Se,S)5 exhibits strong long-wavelength electron-phonon coupling with g/ω0 ~10 in the normal state, indicating the phase transition is driven by interband coupling rather than pure excitonic insulation.