Orbital Dependent Band Renormalization in Fe$_{1+y}$Te$_{1-x}$Se$_{x}$

ORAL

Abstract

One of the important factors in understanding the Fe-based superconductor is their multi-orbital nature. In this study we present ARPES results on the iron chalcogenide Fe$_{1+y}$Te$_{1-x}$Se$_{x}$ (known as the 11 system), the structurally simplest member in Fe-based superconductors. Our result shows that as Te substitutes Se, the Fe dxy orbital has seen a significant increase in the band renormalization while the other orbitals stay unchanged. Our discovery indicates that different orbitals in Fe-based superconductors have different correlation levels, evolve distinctively with crystal parameters and may play different roles in the emergence of superconductivity.

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Authors

  • Zhongkai Liu

    • Stanford University

  • Ming Yi

    • Stanford University

  • Donghui Lu

    • SLAC National Accelerator Laboratory

  • Ruihua He

    • Boston College

  • Jin Hu

    • Tulane University

  • Makoto Hashimoto

    • SLAC National Accelerator Laboratory

  • Sung-kwan Mo

    • Lawrence Berkeley National Laboratory

  • Tom Devereaux

    • SLAC National Accelerator Laboratory

  • Zhiqiang Mao

    • Tulane University

  • Zahid Hussain

    • Lawrence Berkeley National Laboratory

  • Zhi-Xun Shen

    • Stanford University