Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 2015, Vol. 26 ›› Issue (3): 030501 doi: 10.13538/j.1001-8042/nst.26.030501

• NUCLEAR PHYSICS AND INTERDISCIPLINARY RESEARCH • Previous Articles     Next Articles

Angle-resolved photoemission spectroscopy in Hubbard model based on cluster perturbation

XUE Bing , 1, 2 REN Cui-Lan ,1 ZHANG Wei, 1 and ZHU Zhi-Yuan 1   

  1. 1Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
    2Graduate University of Chinese Academy of Sciences, Beijing 100049, China
  • Contact: ZHU Zhi-Yuan E-mail:zhuzhiyuan@sinap.ac.cn
  • Supported by:

    Supported by the National Natural Science Foundation of China (No. 11075196)

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XUE Bing, REN Cui-Lan, ZHANG Wei, and ZHU Zhi-Yuan . Angle-resolved photoemission spectroscopy in Hubbard model based on cluster perturbation.Nuclear Science and Techniques, 2015, 26(3): 030501     doi: 10.13538/j.1001-8042/nst.26.030501

Abstract:

Angle-resolved photoemission spectra (ARPES) are calculated in the Hubbard model by using cluster perturbation method. It is found that in a cluster of 12 sites, the local density of states displays the phase transition from normal conductor to Mott insulator with the increase of the electron-electron coupling. We show that a pseudogap develops from the metallic phase to the insulating phase. Evidence of spin-charge separation is also verified in the calculated single particle spectral functions.

Key words: Angle-resolved photoemission spectra, Cluster perturbation theory, Exact diagonalization