Quadrupolar charge dynamics in the nonmagnetic FeSe${}_{1-x}$S${}_x$ superconductors

W. -L. Zhang, S. -F. Wu, S. Kasahara +3

We use polarization-resolved electronic Raman spectroscopy to study charge dynamics in non-magnetic FeSe${}_{1-x}$S${}_x$ superconductor. We observe two features of the $XY$ quadrupole…