Observation of Spin-Charge Separation in One-Dimensional SrCuO2

Angle-resolved photoemission data from one-dimensional SrCu${\mathrm{O}}_2$ compounds are found to be qualitatively different from that of two-dimensional S${\mathrm{r}}_2$Cu${\mathrm{O}}_2$C${\mathrm{l}}_2$. The data can be quantitatively accounted for by the exact diagonalization calculation based on the t-J model. We identify the two underlying bands having approximately 1.2 and 0.3 eV energy dispersion as that of holon and spinon, with their energy scaled by t and J, respectively.