Dr
Simon Gerber
(Paul Scherrer Institut)
Identifying the degrees of freedom that lead to the emergence of superconductivity in iron-based materials remains the subject of active research. Amongst spin-driven scenarios, it has also been suggested that electron-electron correlations enhance the electron-phonon coupling in iron chalcogenides and related pnictides, but direct experimental verification has been lacking. We show that the electron-phonon coupling strength in FeSe can be quantified by combining two ultrafast experiments into a “coherent lock-in” measurement in the terahertz regime: x-ray diffraction tracks the light-induced coherent lattice motion, while photoemission monitors the coherent changes in the electronic band structure. Comparison with theory reveals an enhancement of the coupling strength owing to correlation effects, highlighting the importance of a cooperative interplay between electron-electron and electron-phonon interactions.
Dr
Simon Gerber
(Paul Scherrer Institut)
Dr
Shuolong Yang
(Cornell University)
Dr
Diling Zhu
(SLAC National Accelerator Laboratory)
Dr
Hadas Soifer
(SLAC National Accelerator Laboratory & Stanford University)
Dr
Jonathan Sobota
(SLAC National Accelerator Laboratory & Stanford University)
Mr
Slavko Rebec
(SLAC National Accelerator Laboratory & Stanford University)
Dr
James Lee
(SLAC National Accelerator Laboratory & Stanford University)
Mr
Tao Jia
(SLAC National Accelerator Laboratory & Stanford University)
Dr
Brian Moritz
(SLAC National Accelerator Laboratory & Stanford University)
Dr
Chunjing Jia
(SLAC National Accelerator Laboratory & Stanford University)
Mr
Alexandre Gauthier
(SLAC National Accelerator Laboratory & Stanford University)
Dr
Yilei Li
(SLAC National Accelerator Laboratory & Stanford University)
Dr
Dominik Leuenberger
(University of Zürich)
Prof.
Yan Zhang
(Peking University)
Dr
Laura Chaix
(Laboratoire Léon Brillouin)
Prof.
Wei Li
(Tsinghua University)
Dr
Hoyoung Jang
(Pohang Accelerator Laboratory)
Dr
Jun-Sik Lee
(SLAC National Accelerator Laboratory)
Dr
Ming Yi
(University of California - Berkeley)
Dr
Georgi Dakoski
(SLAC National Accelerator Laboratory)
Dr
Sanghoon Song
(SLAC National Accelerator Laboratory)
Dr
James Glownia
(SLAC National Accelerator Laboratory)
Dr
Silke Nelson
(SLAC National Accelerator Laboratory)
Prof.
Kyungwan Kim
(Chungbuk National University)
Dr
Yi-De Chuang
(University of California - Berkeley)
Dr
Zahid Hussain
(University of California - Berkeley)
Dr
Robert Moore
(SLAC National Accelerator Laboratory & Stanford University)
Prof.
Thomas Devereaux
(SLAC National Accelerator Laboratory & Stanford University)
Dr
Wei-Sheng Lee
(SLAC National Accelerator Laboratory & Stanford University)
Dr
Patrick Kirchmann
(SLAC National Accelerator Laboratory & Stanford University)
Prof.
Zhi-Xun Shen
(SLAC National Accelerator Laboratory & Stanford University)
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