Motivated by the recent experiments reporting the doping dependence of the short-range charge order (CO) in electron-doped cuprates, we study the resonant x-ray scattering spectrum from d-wave bond-charge fluctuations obtained in the two-dimensional t-J model. We find that (i) the CO is short-range, (ii) the CO peak is pronounced at low temperature, (iii) the peak intensity increases with decreasing carrier doping δ down to δ≈ 0.10 and is substantially suppressed below δ≈ 0.10 due to strong damping, and (iv) the momentum of the CO decreases monotonically down to δ≈ 0.10 and goes up below δ≈ 0.10. These results reasonably capture the major features of the experimental data, and the observed short-range CO can be consistently explained in terms of bond-charge fluctuations with an internal d-wave symmetry.
@article{arxiv.1808.03618,
title = {Doping dependence of d-wave bond-charge excitations in electron-doped cuprates},
author = {Hiroyuki Yamase and Matías Bejas and Andrés Greco},
journal= {arXiv preprint arXiv:1808.03618},
year = {2019}
}
Comments
19 pages, 6 figures; some sections rewritten, appendix added, author name corrected; minor changes