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Gerber, S.; Yang, S.-L.; Zhu, D.; Soifer, H.; Sobota, J. A.; Rebec, S.; Lee, J. J.; Jia, T.; Moritz, B.; Jia, C.; Gauthier, A.; Li, Y.; Leuenberger, D.; Zhang, Y.; Chaix, L.; Li, W.; Jang, H.; Lee, J.-S.; Yi, M.; Dakovski, G. L.; Song, S.; Glownia, J. M.; Nelson, S.; Kim, K. W.; Chuang, Y.-D.; Hussain, Z.; Moore, R. G.; Devereaux, T. P.; Lee, W.-S.; Kirchmann, P. S.; Shen, Z.-X.
Science (American Association for the Advancement of Science), 07/2017, Volume: 357, Issue: 6346Journal Article
The interactions that lead to the emergence of superconductivity in iron-based materials remain a subject of debate. It has been suggested that electron-electron correlations enhance electron-phonon coupling in iron selenide (FeSe) and related pnictides, but direct experimental verification has been lacking. Here we show that the electron-phonon coupling strength in FeSe can be quantified by combining two time-domain experiments into a “coherent lock-in” measurement in the terahertz regime. X-ray diffraction tracks the light-induced femtosecond coherent lattice motion at a single phonon frequency, and photoemission monitors the subsequent coherent changes in the electronic band structure.Comparison with theory reveals a strong enhancement of the coupling strength in FeSe owing to correlation effects. Given that the electron-phonon coupling affects superconductivity exponentially, this enhancement highlights the importance of the cooperative interplay between electron-electron and electron-phonon interactions.
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