Extracting correlation effects from momentum-resolved electron energy loss spectroscopy: Synergistic origin of the dispersion kink in Bi2.1Sr1.9CaCu2O8+x

Edwin W. Huang, Kridsanaphong Limtragool, Chandan Setty, Ali A. Husain, Matteo Mitrano, Peter Abbamonte, and Philip W. Phillips
Phys. Rev. B 103, 035121 – Published 15 January 2021

Abstract

We employ momentum-resolved electron energy loss spectroscopy (M-EELS) on Bi2.1Sr1.9CaCu2O8+x to resolve the issue of the kink feature in the electron dispersion widely observed in the cuprates. To this end, we utilize the GW approximation to relate the density response function measured in M-EELS to the self-energy, isolating contributions from phonons, electrons, and the momentum dependence of the effective interaction to the decay rates. The phononic contributions, present in the M-EELS spectra due to electron-phonon coupling, lead to kink features in the corresponding single-particle spectra at energies between 40 and 80 meV, independent of the doping level. We find that a repulsive interaction constant in momentum space is able to yield the kink attributed to phonons in ARPES. Hence, our analysis of the M-EELS spectra points to local repulsive interactions as a factor that enhances the spectroscopic signatures of electron-phonon coupling in cuprates. We conclude that the strength of the kink feature in cuprates is determined by the combined action of electron-phonon coupling and electron-electron interactions.

  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Received 6 October 2020
  • Revised 20 December 2020
  • Accepted 4 January 2021

DOI:https://doi.org/10.1103/PhysRevB.103.035121

©2021 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Edwin W. Huang*

  • Department of Physics and Institute for Condensed Matter Theory, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA

Kridsanaphong Limtragool

  • Department of Physics, Faculty of Science, Mahasarakham University, Khamriang Sub-District, Kantharawichai District, Maha-Sarakham 44150, Thailand

Chandan Setty

  • Department of Physics, Rice University, Houston, Texas 77005, USA

Ali A. Husain

  • Department of Physics and Astronomy and Quantum Matter Institute, University of British Columbia, Vancouver, BC V6T 1Z4, Canada

Matteo Mitrano

  • Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA

Peter Abbamonte and Philip W. Phillips

  • Department of Physics, University of Illinois at Urbana–Champaign, Urbana, Illinois 61820, USA

  • *edwinwhuang@gmail.com

Article Text (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 103, Iss. 3 — 15 January 2021

Reuse & Permissions
Access Options
CHORUS

Article Available via CHORUS

Download Accepted Manuscript
Author publication services for translation and copyediting assistance advertisement

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review B

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×