Abstract Details
| Computational Study of the High Energy Anomaly in Electron- and Hole-doped High Tc Superconductors | |
|---|---|
| Abstract ID | MAT-22 |
| Presenter | Brian Moritz |
| Presentation Type | Poster |
| Full Author List | B. Moritz (1) , F. Schmitt (2) , W. Meevasana (3) , S. Johnston (1,4) , E. M. Motoyama (3) , M. Greven (1,2,5) , D. H. Lu (5) , C. Kim (6) , R. T. Scalettar (7) , Z.-X. Shen (1,2,3,5) , T. P. Devereaux (1) |
| Affiliations | (1) Stanford Institute for Materials and Energy Sciences, Stanford Linear Accelerator Center and Stanford University (2) Department of Applied Physics, Stanford University (3) Department of Physics, Stanford University (4) Department of Physics and Astronomy, University of Waterloo (5) Stanford Synchrotron Radiation Laboratory, Stanford Linear Accelerator Center (6) Institute of Physics and Applied Physics, Yonsei University (7) Physics Department, University of California - Davis |
| Category | Materials Science |
| Abstract | In a recent series of experiments, high resolution angle-resolved photoemission spectroscopy at binding energies up to ~1 – 1.5 eV reveals the presence of a dispersion anomaly in the high Tc superconductors. This universal anomaly appears at an energy ~ 300 meV in hole-doped compounds and a similar feature also has been observed in the half-filled parent insulators. Newer experiments on the electron-doped compound Nd2-xCexCuO4 reveal a similar feature, but at a higher energy scale ~ 500 – 600 meV. Using quantum Monte Carlo simulations of the single-band Hubbard model, we demonstrate that this simple model captures, qualitatively and quantitatively, the evolution of the anomaly under either hole or electron doping away from the parent insulator. We conclude that strong correlations play a key role in the development of the anomaly and describe how the appearance of the anomaly is affected by spectral weight transfers that accompany the doping. |
| Footnotes | |
| Funding Acknowledgement | The authors acknowledge support from DOE DE-FG03-01ER45929-A001, DOE DE-FC02-06ER25793 (SciDac), DOE DE-AC02-76SF00515, NSF DMR-0705086 and NSERC. This work was made possible, in part, by computational support from NERSC under DOE Contract No. DE-AC02-05CH11231, NSF through TeraGrid resources provided by NCSA, RQCHP through Mammouth-parallele at the University of Sherbrooke and the facilities of SHARCNET. |