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, Z. X. Shen

Research output: Contribution to journalArticlepeer-review

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±0.06 THz. 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.

Original languageEnglish
Article number176403
JournalPhysical Review Letters
Volume122
Issue number17
DOIs
StatePublished - 3 May 2019
Externally publishedYes

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