Mode-Selective Coupling of Coherent Phonons to the Bi2212 Electronic Band Structure
| Autor: | Hadas Soifer, D. Leuenberger, Zhi-Xun Shen, Hiroshi Eisaki, Shuolong Yang, Yu He, Patrick S. Kirchmann, Jonathan Sobota |
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| Rok vydání: | 2018 |
| Předmět: |
General Physics
Phonon Photoemission spectroscopy General Physics and Astronomy FOS: Physical sciences 01 natural sciences Mathematical Sciences Superconductivity (cond-mat.supr-con) Condensed Matter - Strongly Correlated Electrons symbols.namesake Engineering Condensed Matter::Superconductivity 0103 physical sciences Cuprate 010306 general physics Electronic band structure Superconductivity Physics Condensed matter physics Strongly Correlated Electrons (cond-mat.str-el) Condensed Matter - Superconductivity Coupling (probability) Physical Sciences symbols Condensed Matter::Strongly Correlated Electrons Raman spectroscopy Energy (signal processing) |
| Zdroj: | Physical review letters, vol 122, iss 17 |
| ISSN: | 1079-7114 |
| Popis: | Cuprate superconductors host a multitude of low-energy optical phonons. Using time- and angle-resolved photoemission spectroscopy, we study coherent phonons in Bi$_{2}$Sr$_{2}$Ca$_{0.92}$Y$_{0.08}$Cu$_{2}$O$_{8+\delta}$. Sub-meV modulations of the electronic band structure are observed at frequencies of $3.94\pm 0.01$ and $5.59\pm 0.06$ 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 CuO$_{2}$-derived $A_{1g}$ phonons. The Bi- and Sr-derived $A_{1g}$ 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 CuO$_{2}$ planes and dictate thermodynamic properties. Comment: 7 pages, 3 figures |
| Databáze: | OpenAIRE |
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