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Electron-phonon interactions and photoemission kink in cuprates: A <i>GW</i> perturbation theory study

ORAL

Abstract

The nexus of electron-phonon (e-ph) and many-electron interactions plays an important role in shaping the electron spectral function. We present first-principles calculations of the observed photoemission kink in cuprates using our recently developed method for e-ph coupling, the GW perturbation theory (GWPT) [1]. In this approach, the e-ph coupling is calculated using linear-response theory within the ab initio GW method, combined with Wannier interpolation technique. We find that self-energy effects significantly renormalize the e-ph interactions in the cuprates, giving rise to dramatic changes in the strength of the photoemission kink as compared with results from standard density-functional perturbation theory.

[1] Z. Li, G. Antonius, M. Wu, F. H. da Jornada, and S. G. Louie, Phys. Rev. Lett. 122, 186402 (2019).

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Presenters

  • Zhenglu Li

    Department of Physics, University of California, Berkeley, Berkeley, California 94720, USA and Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, C, Lawrence Berkeley National Laboratory and University of California at Berkeley, Department of Physics, University of California at Berkeley and Lawrence Berkeley National Laboratory

Authors

  • Zhenglu Li

    Department of Physics, University of California, Berkeley, Berkeley, California 94720, USA and Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, C, Lawrence Berkeley National Laboratory and University of California at Berkeley, Department of Physics, University of California at Berkeley and Lawrence Berkeley National Laboratory

  • Meng Wu

    University of California, Berkeley, Lawrence Berkeley National Laboratory and University of California at Berkeley, Department of Physics, University of California at Berkeley and Lawrence Berkeley National Laboratory

  • Yang-hao Chan

    Lawrence Berkeley National Laboratory and University of California at Berkeley, Lawrence Berkeley National Laboratory

  • Steven Louie

    University of California at Berkeley, and Lawrence Berkeley National Laboratory, Department of Physics, University of California, Berkeley, Berkeley, California 94720, USA and Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, C, University of California, Berkeley, Department of Physics, University of California, Berkeley, Lawrence Berkeley National Laboratory and University of California at Berkeley, Department of Physics, University of California at Berkeley and Lawrence Berkeley National Laboratory, Department of Physics, UC Berkeley, Physics, Unviersyt of Calfornia, Berkeley, Physics, University of California, Berkeley, Physics, University of California, Berkeley and Lawrence Berkeley National Lab