2008/07/16 by T. Xiang, Tao Xiang, H. G. Luo +7 · 2 citations
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Angle-resolved photoemission spectroscopy #Antiferromagnetism #Band gap #Charge (physics) #Condensed matter physics #Cuprate #Doping #Electron #Electronic band structure #Electronic structure #Fermi surface #Hubbard model #Magnetic and transport properties of perovskites and related materials #Physics #Physics of Superconductivity and Magnetism #Quantum mechanics #Superconductivity #cond-mat.str-el #cond-mat.supr-con #t-J model
paper · pdf · doi:10.1103/physrevb.79.014524
4 pages 3 figures
arxiv created 2008/07/16 · openalex publication_date 2009/01/30 · arxiv updated 2013/05/29 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We propose that the upper Hubbard band (electronlike) and the Zhang-Rice singlet band (holelike) are two essential components in describing low-energy excitations of electron-doped cuprate superconductors. We find that the gap between these two bands is significantly smaller than the charge-transfer gap measured by optics and is further reduced upon doping. This indicates that the charge fluctuation is strong and the system is in the intermediate correlation regime. A two-band model is derived. In the limit that the intraband and interband hopping integrals are equal to each other, this model is equivalent to the unconstrained t\text\ensuremath-J model with on-site Coulomb repulsions.