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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


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
Issue number17
StatePublished - 3 May 2019
Externally publishedYes


FundersFunder number
Division of Materials Sciences and EngineeringDE-AC02-76SF00515
Gordon and Betty Moore FoundationGBMF4546
Cornell University
U.S. Department of Energy
Stanford University
Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen ForschungP300P2151328
Basic Energy Sciences
Office of Science


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