Consistency between reflection M-EELS and optical spectroscopy measurements of the long-wavelength density response of Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+x}$

Jin Chen, Xuefei Guo, Christian Boyd +11

The density fluctuation spectrum captures many fundamental properties of strange metals. Using momentum-resolved electron energy-loss spectroscopy (M-EELS), we recently showed that…