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:
- more »
- 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. https://doi.org/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. https://doi.org/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 = {Thu Jul 06 00:00:00 EDT 2017},
month = {Thu Jul 06 00:00:00 EDT 2017}
}
https://doi.org/10.1126/science.aak9946
Web of Science
Works referenced in this record:
Ultrafast Modulation of the Chemical Potential in by Coherent Phonons
journal, May 2014
- Yang, L. X.; Rohde, G.; Rohwer, T.
- Physical Review Letters, Vol. 112, Issue 20
Generalized Gradient Approximation Made Simple
journal, October 1996
- Perdew, John P.; Burke, Kieron; Ernzerhof, Matthias
- Physical Review Letters, Vol. 77, Issue 18, p. 3865-3868
Why Does Undoped FeSe Become a High- Superconductor under Pressure?
journal, April 2009
- Imai, T.; Ahilan, K.; Ning, F. L.
- Physical Review Letters, Vol. 102, Issue 17
Linac Coherent Light Source: The first five years
journal, March 2016
- Bostedt, Christoph; Boutet, Sébastien; Fritz, David M.
- Reviews of Modern Physics, Vol. 88, Issue 1
Direct characterization of photoinduced lattice dynamics in BaFe2As2
journal, June 2015
- Gerber, S.; Kim, K. W.; Zhang, Y.
- Nature Communications, Vol. 6, Issue 1
High-accuracy measurements of the refractive index and its temperature coefficient of calcium fluoride in a wide wavelength range from 138 to 2326 nm
journal, January 2002
- Daimon, Masahiko; Masumura, Akira
- Applied Optics, Vol. 41, Issue 25
Strong Electron Correlations in the Normal State of the Iron-Based Superconductor Observed by Angle-Resolved Photoemission Spectroscopy
journal, March 2010
- Tamai, A.; Ganin, A. Y.; Rozbicki, E.
- Physical Review Letters, Vol. 104, Issue 9
Structural and superconductivity study on α-FeSex
journal, April 2010
- Li, Zhaofei; Ju, Jing; Tang, Jun
- Journal of Physics and Chemistry of Solids, Vol. 71, Issue 4
Influence of pulse width and detuning on coherent phonon generation
journal, October 2015
- Nakamura, Kazutaka G.; Shikano, Yutaka; Kayanuma, Yosuke
- Physical Review B, Vol. 92, Issue 14
Interplay between lattice and spin states degree of freedom in the FeSe superconductor: Dynamic spin state instabilities
journal, April 2013
- Gnezdilov, Vladimir; Pashkevich, Yurii G.; Lemmens, Peter
- Physical Review B, Vol. 87, Issue 14
Theory for displacive excitation of coherent phonons
journal, January 1992
- Zeiger, H. J.; Vidal, J.; Cheng, T. K.
- Physical Review B, Vol. 45, Issue 2
QUANTUM ESPRESSO: a modular and open-source software project for quantum simulations of materials
journal, September 2009
- Giannozzi, Paolo; Baroni, Stefano; Bonini, Nicola
- Journal of Physics: Condensed Matter, Vol. 21, Issue 39, Article No. 395502
Theory of Superconductivity
journal, December 1957
- Bardeen, J.; Cooper, L. N.; Schrieffer, J. R.
- Physical Review, Vol. 108, Issue 5
Pressure evolution of the low-temperature crystal structure and bonding of the superconductor FeSe
journal, August 2009
- Margadonna, S.; Takabayashi, Y.; Ohishi, Y.
- Physical Review B, Vol. 80, Issue 6
Thickness-Dependent Coherent Phonon Frequency in Ultrathin FeSe/SrTiO 3 Films
journal, June 2015
- Yang, Shuolong; Sobota, Jonathan A.; Leuenberger, Dominik
- Nano Letters, Vol. 15, Issue 6
X-Ray Interactions: Photoabsorption, Scattering, Transmission, and Reflection at E = 50-30,000 eV, Z = 1-92
journal, July 1993
- Henke, B. L.; Gullikson, E. M.; Davis, J. C.
- Atomic Data and Nuclear Data Tables, Vol. 54, Issue 2, p. 181-342
Kinetic frustration and the nature of the magnetic and paramagnetic states in iron pnictides and iron chalcogenides
journal, September 2011
- Yin, Z. P.; Haule, K.; Kotliar, G.
- Nature Materials, Vol. 10, Issue 12
Angle-resolved photoemission spectroscopy of superconducting LiFeAs: Evidence for strong electron-phonon coupling
journal, April 2011
- Kordyuk, A. A.; Zabolotnyy, V. B.; Evtushinsky, D. V.
- Physical Review B, Vol. 83, Issue 13
Electron-Phonon Interaction in the Model
journal, April 2004
- Rösch, O.; Gunnarsson, O.
- Physical Review Letters, Vol. 92, Issue 14
Strong interplay between stripe spin fluctuations, nematicity and superconductivity in FeSe
journal, December 2015
- Wang, Qisi; Shen, Yao; Pan, Bingying
- Nature Materials, Vol. 15, Issue 2
Electronic and magnetic phase diagram of β-Fe1.01Se with superconductivity at 36.7 K under pressure
journal, June 2009
- Medvedev, S.; McQueen, T. M.; Troyan, I. A.
- Nature Materials, Vol. 8, Issue 8
Strong spin fluctuations in observed by neutron spectroscopy
journal, May 2015
- Rahn, M. C.; Ewings, R. A.; Sedlmaier, S. J.
- Physical Review B, Vol. 91, Issue 18
Femtosecond optical/hard X-ray timing diagnostics at an FEL: implementation and performance
conference, May 2013
- Lemke, Henrik T.; Weaver, Matt; Chollet, Matthieu
- SPIE Optics + Optoelectronics, SPIE Proceedings
Ultrafast Structural Dynamics of the Fe-Pnictide Parent Compound
journal, February 2015
- Rettig, L.; Mariager, S. O.; Ferrer, A.
- Physical Review Letters, Vol. 114, Issue 6
Coherent excitations and electron–phonon coupling in Ba/EuFe 2 As 2 compounds investigated by femtosecond time- and angle-resolved photoemission spectroscopy
journal, February 2013
- Avigo, I.; Cortés, R.; Rettig, L.
- Journal of Physics: Condensed Matter, Vol. 25, Issue 9
The X-ray Pump–Probe instrument at the Linac Coherent Light Source
journal, April 2015
- Chollet, Matthieu; Alonso-Mori, Roberto; Cammarata, Marco
- Journal of Synchrotron Radiation, Vol. 22, Issue 3
Tetragonal-to-Orthorhombic Structural Phase Transition at 90 K in the Superconductor
journal, July 2009
- McQueen, T. M.; Williams, A. J.; Stephens, P. W.
- Physical Review Letters, Vol. 103, Issue 5
Interfacial mode coupling as the origin of the enhancement of Tc in FeSe films on SrTiO3
journal, November 2014
- Lee, J. J.; Schmitt, F. T.; Moore, R. G.
- Nature, Vol. 515, Issue 7526
Performance of a beam-multiplexing diamond crystal monochromator at the Linac Coherent Light Source
journal, June 2014
- Zhu, Diling; Feng, Yiping; Stoupin, Stanislav
- Review of Scientific Instruments, Vol. 85, Issue 6, Article No. 063106
Crystal structure of the new FeSe1−x superconductor
journal, January 2008
- Margadonna, Serena; Takabayashi, Yasuhiro; McDonald, Martin T.
- Chemical Communications, Issue 43
Strong pressure-dependent electron-phonon coupling in FeSe
journal, June 2014
- Mandal, Subhasish; Cohen, R. E.; Haule, K.
- Physical Review B, Vol. 89, Issue 22
Electron-Phonon Coupling and a Polaron in the Model: From the Weak to the Strong Coupling Regime
journal, July 2004
- Mishchenko, A. S.; Nagaosa, N.
- Physical Review Letters, Vol. 93, Issue 3
An iterative technique for the rectification of observed distributions
journal, June 1974
- Lucy, L. B.
- The Astronomical Journal, Vol. 79
The puzzle of high temperature superconductivity in layered iron pnictides and chalcogenides
journal, October 2010
- Johnston, David C.
- Advances in Physics, Vol. 59, Issue 6
Tunneling phonon structures and the calculated phonon density of states for Bi2Sr2CaCu2O8
journal, April 1998
- Shimada, D.; Tsuda, N.; Paltzer, U.
- Physica C: Superconductivity, Vol. 298, Issue 3-4
Ultrafast transient generation of spin-density-wave order in the normal state of BaFe2As2 driven by coherent lattice vibrations
journal, April 2012
- Kim, K. W.; Pashkin, A.; Schäfer, H.
- Nature Materials, Vol. 11, Issue 6
Angle-resolved photoemission studies of the cuprate superconductors
journal, April 2003
- Damascelli, Andrea; Hussain, Zahid; Shen, Zhi-Xun
- Reviews of Modern Physics, Vol. 75, Issue 2