|
Hokkaido University Collection of Scholarly and Academic Papers >
Graduate School of Science / Faculty of Science >
Peer-reviewed Journal Articles, etc >
Electron self-energy from quantum charge fluctuations in the layered t-J model with long-range Coulomb interaction
| Title: | Electron self-energy from quantum charge fluctuations in the layered t-J model with long-range Coulomb interaction |
| Authors: | Yamase, Hiroyuki Browse this author | | Bejas, Matias Browse this author | | Greco, Andres Browse this author |
| Issue Date: | 26-Jul-2021 |
| Publisher: | American Physical Society (APS) |
| Journal Title: | Physical Review B |
| Volume: | 104 |
| Issue: | 4 |
| Start Page: | 045141 |
| Publisher DOI: | 10.1103/PhysRevB.104.045141 |
| Abstract: | Employing a large-N scheme of the layered t-J model with the long-range Coulomb interaction, which captures the fine details of the charge excitation spectra recently observed in cuprate superconductors, we explore the role of charge fluctuations on the electron self-energy. We fix the temperature at zero and focus on quantum charge fluctuations. We find a pronounced asymmetry of the imaginary part of the self-energy Im Sigma(k, omega) with respect to omega = 0, which is driven by strong electron correlation effects. The quasiparticle weight is reduced dramatically, which occurs almost isotropically along the Fermi surface. Concomitantly, an incoherent band and a sharp side band are generated and acquire sizable spectral weight. All these features are driven by the usual on-site charge fluctuations, which are realized in a rather high-energy region and yield plasmon excitations. On the other hand, the low-energy region with the scale of the superexchange interaction J is dominated by bond-charge fluctuations. Surprisingly, compared with the effect of on-site charge fluctuations, their effect on the electron self-energy is much weaker, even if the system approaches close to bond-charge instabilities. Furthermore, quantum charge dynamics does not produce a clear kink nor a pseudogap in the electron dispersion. |
| Rights: | ©2021 American Physical Society |
| Type: | article |
| URI: | http://hdl.handle.net/2115/82622 |
| Appears in Collections: | 理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
|
Submitter: 山瀬 博之
|
