Mode-Selective Coupling of Coherent Phonons to the Bi2212 Electronic Band Structure

S.-L. Yang, J. A. Sobota, Y. He, D. Leuenberger, H. Soifer, H. Eisaki, P. S. Kirchmann, and Z.-X. Shen
Phys. Rev. Lett. 122, 176403 – Published 3 May 2019
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Abstract

Cuprate superconductors host a multitude of low-energy optical phonons. Using time- and angle-resolved photoemission spectroscopy, we study coherent phonons in Bi2Sr2Ca0.92Y0.08Cu2O8+δ. Sub-meV modulations of the electronic band structure are observed at frequencies of 3.94±0.01 and 5.59±0.06THz. For the dominant mode at 3.94 THz, the amplitude of the band energy oscillation weakly increases as a function of momentum away from the node. Theoretical calculations allow identifying the observed modes as CuO2-derived A1g phonons. The Bi- and Sr-derived A1g modes which dominate Raman spectra in the relevant frequency range are absent in our measurements. This highlights the mode selectivity for phonons coupled to the near-Fermi-level electrons, which originate from CuO2 planes and dictate thermodynamic properties.

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  • Received 26 September 2017
  • Revised 17 November 2018

DOI:https://doi.org/10.1103/PhysRevLett.122.176403

© 2019 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

S.-L. Yang1,2,*, J. A. Sobota1,3, Y. He1,2, D. Leuenberger1,2, H. Soifer1, H. Eisaki4, P. S. Kirchmann1,†, and Z.-X. Shen1,2,‡

  • 1Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
  • 2Geballe Laboratory for Advanced Materials, Departments of Physics and Applied Physics, Stanford University, Stanford, California 94305, USA
  • 3Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
  • 4Electronics and Photonics Research Institute, National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki 305-8558, Japan

  • *Present address: Kavli Institute at Cornell for Nanoscale Science; Laboratory of Atomic and Solid State Physics, Department of Physics; Department of Materials Science and Engineering. Cornell University, Ithaca, New York 14853, USA.
  • kirchman@slac.stanford.edu
  • zxshen@stanford.edu

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Issue

Vol. 122, Iss. 17 — 3 May 2019

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