Critical charge fluctuations and quantum coherent state in excitonic insulator Ta2NiSe5

Pavel A. Volkov, Mai Ye, Himanshu Lohani, Irena Feldman, Amit Kanigel, Kristjan Haule, Girsh Blumberg (A) and (B): Raman response χ”aa and χ”ac in the aa and ac scattering geometries, respectively. (C) and (D): χ”aa and χ”ac in the range enclosed by the dashed white boxes in (A) and (B) on a linear frequency scale. Attraction between electrons in metals drives superconductivity – …

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