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- W3040447684 abstract "Ta2NiSe5 became one of the most investigated candidate materials for hosting an excitonic insulator ground state. Many studies describe the corresponding phase transition as a condensation of excitons breaking a continuous symmetry. This view got challenged recently pointing out the importance of the loss of two mirror symmetries at a structural phase transition that occurs together with the semiconductor - excitonic insulator transition. For such a scenario an unstable optical zone-center phonon at low energy is proposed to drive the transition. Here we report on the experimental observation of such a soft mode behavior using Raman spectroscopy. In addition we find a novel spectral feature, likely of electronic or joint electronic and phononic origin, that is clearly distinct from the lattice dynamics and that becomes dominant at Tc." @default.
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- W3040447684 date "2020-07-03" @default.
- W3040447684 modified "2023-09-27" @default.
- W3040447684 title "Observation of the soft mode behavior across the structural phase transition in the excitonic insulator Ta2NiSe5" @default.
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