@article{oai:repo.qst.go.jp:00048715,
 author = {Ishii, Kenji and Tohyama, Takami and Asano, Shun and Sato, Kentro and Fujita, Masaki and Wakimoto, Shuichi and Tustsui, Kenji and Sota, Shigetoshi and Miyawaki, Jun and Niwa, Hideharu and Harada, Yoshihisa and Pelliciari, Jonathan and Huang, Yaobo and Schmitt, Thorsten and Yamamoto, Yoshiya and Mizuki, Jun'ichiro and 石井 賢司 and 筒井 健二 and 水木 純一郎},
 issue = {11},
 journal = {Physical Review B},
 month = {Sep},
 note = {We investigate electronic excitations in La2−x (Br,Sr)x CuO4 using resonant inelastic x-ray scattering (RIXS) at the oxygen K edge. RIXS spectra of the hole-doped cuprates show clear momentum dependence below 1 eV. The broad spectral weight exhibits positive dispersion and shifts to higher energy with increasing hole concentration. Theoretical calculation of the dynamical charge structure factor on oxygen orbitals in a three-band Hubbard model is consistent with the experimental observation of the momentum and doping dependence, and therefore the momentum-dependent spectral weight is ascribed to intraband charge excitations which have been observed in electron-doped cuprates. Our results confirm that the momentum-dependent charge excitations exist on the order of the transfer energy (t), and the broad spectral line shape indicates damped and incoherent character of the charge excitations at the energy range in the doped Mott insulators.},
 pages = {115148-1--115148-8},
 title = {Observation of momentum-dependent charge excitations in hole-doped cuprates using resonant inelastic x-ray scattering at the oxygen K edge},
 volume = {96},
 year = {2017}
}