Fig. 3: Excitonic fluctuations and phonon lineshapes.
From: Direct observation of excitonic instability in Ta2NiSe5
a Mode 2 (blue) fitted with the Fano lineshape and QEP (red) with the damped harmonic oscillator lineshape. b Peak amplitude, energy, width, and absolute value of Fano asymmetry q extracted from the fitting, and the error bars represent the standard deviation in the fitting procedure. Black dashed line indicates TC. c Mode 2 remains asymmetric well below TC. d Mode 1 also becomes asymmetric in the low-temperature insulating phase. Black dashed lines in (c) and (d) represent the center energy of Mode 2 and Mode 1, respectively.
