Mapping the unoccupied state dispersions in Ta2NiSe5 with resonant inelastic x-ray scattering

  title={Mapping the unoccupied state dispersions in 
 with resonant inelastic x-ray scattering},
  author={Claude Monney and Marc Herzog and Aki Pulkkinen and Y B Huang and Jonathan Pelliciari and Paul Olalde-Velasco and Naoyuki Katayama and Minoru Nohara and H. Takagi and Thorsten Schmitt and Takashi Mizokawa},
  journal={Physical Review B},
The transition metal chalcogenide ${\mathrm{Ta}}_{2}{\mathrm{NiSe}}_{5}$ undergoes a second-order phase transition at ${T}_{c}=328\phantom{\rule{0.16em}{0ex}}\text{K}$ involving a small lattice distortion. Below ${T}_{c}$, a band gap at the center of its Brillouin zone increases up to about 0.35 eV. In this work, we study the electronic structure of ${\mathrm{Ta}}_{2}{\mathrm{NiSe}}_{5}$ in its low-temperature semiconducting phase, using resonant inelastic x-ray scattering (RIXS) at the Ni ${L… 

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