Infrared spectroscopy with DFT shows that in RbTi3Bi5 and CsTi3Bi5, bismuth p-states contribute substantially to the low-energy optical response, correlations are strong, and a 150 K phonon plus localization-peak anomaly may mark the onset of bulk electronic nematicity.
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Interplay of $d$- and $p$-states in RbTi$_3$Bi$_5$ and CsTi$_3$Bi$_5$ flat-band kagome metals
Infrared spectroscopy with DFT shows that in RbTi3Bi5 and CsTi3Bi5, bismuth p-states contribute substantially to the low-energy optical response, correlations are strong, and a 150 K phonon plus localization-peak anomaly may mark the onset of bulk electronic nematicity.