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Title: Femtosecond electron-phonon lock-in by photoemission and x-ray free-electron laser

Abstract

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.

Authors:
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Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1436819
Grant/Contract Number:  
award262821; AC02-76SF00515; award301362; AC02-05CH11231
Resource Type:
Published Article
Journal Name:
Science
Additional Journal Information:
Journal Name: Science Journal Volume: 357 Journal Issue: 6346; Journal ID: ISSN 0036-8075
Publisher:
American Association for the Advancement of Science (AAAS)
Country of Publication:
United States
Language:
English

Citation Formats

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., and Shen, Z. -X. Femtosecond electron-phonon lock-in by photoemission and x-ray free-electron laser. United States: N. p., 2017. Web. doi:10.1126/science.aak9946.
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. Femtosecond electron-phonon lock-in by photoemission and x-ray free-electron laser. United States. doi:10.1126/science.aak9946.
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., and Shen, Z. -X. Thu . "Femtosecond electron-phonon lock-in by photoemission and x-ray free-electron laser". United States. doi:10.1126/science.aak9946.
@article{osti_1436819,
title = {Femtosecond electron-phonon lock-in by photoemission and x-ray free-electron laser},
author = {Gerber, S. and Yang, S. -L. and Zhu, D. and Soifer, H. and Sobota, J. A. and Rebec, S. and Lee, J. J. and Jia, T. and Moritz, B. and Jia, C. and Gauthier, A. and Li, Y. and Leuenberger, D. and Zhang, Y. and Chaix, L. and Li, W. and Jang, H. and Lee, J. -S. and Yi, M. and Dakovski, G. L. and Song, S. and Glownia, J. M. and Nelson, S. and Kim, K. W. and Chuang, Y. -D. and Hussain, Z. and Moore, R. G. and Devereaux, T. P. and Lee, W. -S. and Kirchmann, P. S. and Shen, Z. -X.},
abstractNote = {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.},
doi = {10.1126/science.aak9946},
journal = {Science},
number = 6346,
volume = 357,
place = {United States},
year = {2017},
month = {7}
}

Journal Article:
Free Publicly Available Full Text
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DOI: 10.1126/science.aak9946

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Cited by: 31 works
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