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

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...

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Published in:	Science (American Association for the Advancement of Science) Vol. 357; no. 6346; p. 71
Main Authors:	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
Format:	Journal Article
Language:	English
Published:	United States 07.07.2017
ISSN:	1095-9203, 1095-9203
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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.
AbstractList	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.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. 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.
Author	Dakovski, G L Jia, T Song, S Zhu, D Yang, S-L Jang, H Jia, C Lee, J J Soifer, H Kim, K W Rebec, S Leuenberger, D Nelson, S Shen, Z-X Chuang, Y-D Moore, R G Sobota, J A Moritz, B Zhang, Y Kirchmann, P S Gauthier, A Hussain, Z Gerber, S Lee, J-S Glownia, J M Chaix, L Li, Y Devereaux, T P Li, W Lee, W-S Yi, M
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Berkeley National Laboratory, Berkeley, CA 94720, USA – sequence: 6 givenname: S surname: Rebec fullname: Rebec, S organization: Geballe Laboratory for Advanced Materials, Departments of Physics and Applied Physics, Stanford University, Stanford, CA 94305, USA – sequence: 7 givenname: J J orcidid: 0000-0003-2004-5348 surname: Lee fullname: Lee, J J organization: Geballe Laboratory for Advanced Materials, Departments of Physics and Applied Physics, Stanford University, Stanford, CA 94305, USA – sequence: 8 givenname: T surname: Jia fullname: Jia, T organization: Geballe Laboratory for Advanced Materials, Departments of Physics and Applied Physics, Stanford University, Stanford, CA 94305, USA – sequence: 9 givenname: B orcidid: 0000-0002-3747-8484 surname: Moritz fullname: Moritz, B organization: Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory and Stanford University, Menlo Park, CA 94025, USA – sequence: 10 givenname: C orcidid: 0000-0001-7999-1932 surname: Jia fullname: Jia, C organization: Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory and Stanford University, Menlo Park, CA 94025, USA – sequence: 11 givenname: A surname: Gauthier fullname: Gauthier, A organization: Geballe Laboratory for Advanced Materials, Departments of Physics and Applied Physics, Stanford University, Stanford, CA 94305, USA – sequence: 12 givenname: Y orcidid: 0000-0003-1416-0825 surname: Li fullname: Li, Y organization: Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory and Stanford University, Menlo Park, CA 94025, USA – sequence: 13 givenname: D surname: Leuenberger fullname: Leuenberger, D organization: Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory and Stanford University, Menlo Park, CA 94025, USA – sequence: 14 givenname: Y surname: Zhang fullname: Zhang, Y organization: International Center for Quantum Materials, Peking University, Beijing 100871, China – sequence: 15 givenname: L surname: Chaix fullname: Chaix, L organization: Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory and Stanford University, Menlo Park, CA 94025, USA – sequence: 16 givenname: W surname: Li fullname: Li, W organization: Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory and Stanford University, Menlo Park, CA 94025, USA – sequence: 17 givenname: H surname: Jang fullname: Jang, H organization: Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA – sequence: 18 givenname: J-S orcidid: 0000-0001-7677-0421 surname: Lee fullname: Lee, J-S organization: Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA – sequence: 19 givenname: M orcidid: 0000-0001-8934-7905 surname: Yi fullname: Yi, M organization: Department of Physics, University of California-Berkeley, Berkeley, CA 94720, USA – sequence: 20 givenname: G L surname: Dakovski fullname: Dakovski, G L organization: Linac Coherent Light Source (LCLS), SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA – sequence: 21 givenname: S orcidid: 0000-0003-3493-1850 surname: Song fullname: Song, S organization: Linac Coherent Light Source (LCLS), SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA – sequence: 22 givenname: J M surname: Glownia fullname: Glownia, J M organization: Linac Coherent Light Source (LCLS), SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA – sequence: 23 givenname: S orcidid: 0000-0002-2937-6074 surname: Nelson fullname: Nelson, S organization: Linac Coherent Light Source (LCLS), SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA – sequence: 24 givenname: K W orcidid: 0000-0003-3833-5378 surname: Kim fullname: Kim, K W organization: Department of Physics, Chungbuk National University, Cheongju 28644, Korea – sequence: 25 givenname: Y-D surname: Chuang fullname: Chuang, Y-D organization: Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA – sequence: 26 givenname: Z surname: Hussain fullname: Hussain, Z organization: Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA – sequence: 27 givenname: R G surname: Moore fullname: Moore, R G organization: Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory and Stanford University, Menlo Park, CA 94025, USA – sequence: 28 givenname: T P orcidid: 0000-0001-8072-9237 surname: Devereaux fullname: Devereaux, T P organization: Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory and Stanford University, Menlo Park, CA 94025, USA – sequence: 29 givenname: W-S surname: Lee fullname: Lee, W-S email: leews@stanford.edu, kirchman@stanford.edu, zxshen@stanford.edu organization: Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory and Stanford University, Menlo Park, CA 94025, USA. leews@stanford.edu kirchman@stanford.edu zxshen@stanford.edu – sequence: 30 givenname: P S orcidid: 0000-0002-4835-0654 surname: Kirchmann fullname: Kirchmann, P S email: leews@stanford.edu, kirchman@stanford.edu, zxshen@stanford.edu organization: Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory and Stanford University, Menlo Park, CA 94025, USA. leews@stanford.edu kirchman@stanford.edu zxshen@stanford.edu – sequence: 31 givenname: Z-X orcidid: 0000-0002-1454-0281 surname: Shen fullname: Shen, Z-X email: leews@stanford.edu, kirchman@stanford.edu, zxshen@stanford.edu organization: Geballe Laboratory for Advanced Materials, Departments of Physics and Applied Physics, Stanford University, Stanford, CA 94305, USA
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Snippet	The interactions that lead to the emergence of superconductivity in iron-based materials remain a subject of debate. It has been suggested that...
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Title	Femtosecond electron-phonon lock-in by photoemission and x-ray free-electron laser
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