Dual structure in the charge excitation spectrum of electron-doped cuprates
| Autor: | Andrés Greco, Hiroyuki Yamase, Matías Bejas |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
RXS
RIXS Ciencias Físicas FOS: Physical sciences 02 engineering and technology Electron doped Otras Ciencias Físicas 01 natural sciences purl.org/becyt/ford/1 [https] Superconductivity (cond-mat.supr-con) 0103 physical sciences Coulomb Cuprate CHARGE ORDER 010306 general physics Plasmon Physics Condensed matter physics Scattering Condensed Matter - Superconductivity CUPRATES purl.org/becyt/ford/1.3 [https] 021001 nanoscience & nanotechnology 0210 nano-technology CIENCIAS NATURALES Y EXACTAS Excitation |
| Zdroj: | CONICET Digital (CONICET) Consejo Nacional de Investigaciones Científicas y Técnicas instacron:CONICET |
| DOI: | 10.48550/arxiv.1709.09468 |
| Popis: | Motivated by the recent resonant x-ray scattering (RXS) and resonant inelastic x-ray scattering (RIXS) experiments in electron-doped cuprates, we study the charge excitation spectrum in a layered t-J model with the long-range Coulomb interaction. We show that the spectrum is not dominated by a specific type of charge excitations, but by different kinds of charge fluctuations, and is characterized by a dual structure in the energy space. Low-energy charge excitations correspond to various types of bond-charge fluctuations driven by the exchange term (J-term) whereas high-energy charge excitations are due to usual on-site charge fluctuations and correspond to plasmon excitations above the particle-hole continuum. The interlayer coupling, which is frequently neglected in many theoretical studies, is particularly important to the high-energy charge excitations. Comment: 28 pages, 9 figures; [v3] slight change in title to match published version |
| Databáze: | OpenAIRE |
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