Fig. 2
Crystal and electronic structures of ReO2. a Crystal structure of ReO2. b 1/8 Brillouin zone. The red lines indicate the paths where bands are four-fold degenerate. c Electronic band structure along with PDOS. d–f The enlarged band structure around the four-fold-degenerate neck-crossing points. The hourglass dispersion along U–R is somewhat distorted, as schematically shown in the inset of e
