Electron–phonon-driven three-dimensional metallicity in an insulating cuprate
- Baldini, Edoardo Institute of Physics, Laboratory for Ultrafast Microscopy and Electron Scattering, E´ cole Polytechnique Fe´de´ rale de Lausanne, CH-1015 Lausanne, Switzerland and Institute of Chemical Sciences and Engineering, Laboratory of Ultrafast Spectroscopy, E´ cole Polytechnique Fe´de´ rale de Lausanne, CH-1015 Lausanne, Switzerland
- Sentef, Michael A. Max Planck Institute for the Structure and Dynamics of Matter, D-22761 Hamburg, Germany
- Acharya, Swagata Department of Physics, King’s College London, London WC2R 2LS, United Kingdom
- Brumme, Thomas Max Planck Institute for the Structure and Dynamics of Matter, D-22761 Hamburg, Germany and Wilhelm Ostwald Institut of Physical and Theoretical Chemistry, University of Leipzig, D-04103 Leipzig, Germany
- Sheveleva, Evgeniia Department of Physics, University of Fribourg, CH-1700 Fribourg, Switzerland
- Lyzwa, Fryderyk Department of Physics, University of Fribourg, CH-1700 Fribourg, Switzerland
- Pomjakushina, Ekaterina Solid State Chemistry Group, Laboratory for Multiscale Materials Experiments, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
- Bernhard, Christian Department of Physics, University of Fribourg, CH-1700 Fribourg, Switzerland
- van Schilfgaarde, Mark Department of Physics, King’s College London, London WC2R 2LS, United Kingdom
- Carbone, Fabrizio Institute of Physics, Laboratory for Ultrafast Microscopy and Electron Scattering, E´ cole Polytechnique Fe´de´ rale de Lausanne, CH-1015 Lausanne, Switzerland
- Rubio, Angel Max Planck Institute for the Structure and Dynamics of Matter, D-22761 Hamburg, Germany
- Weber, Cédric Department of Physics, King’s College London, London WC2R 2LS, United Kingdom
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24.03.2020
Published in:
- Proceedings of the National Academy of Sciences. - 2020, vol. 117, no. 12, p. 6409-6416
English
The role of the crystal lattice for the electronic properties of cuprates and other high-temperature superconductors remains controversial despite decades of theoretical and experimental efforts. While the paradigm of strong electronic correlations suggests a purely electronic mechanism behind the insulator-to-metal transition, recently the mutual enhancement of the electron–electron and the electron–phonon interaction and its relevance to the formation of the ordered phases have also been emphasized. Here, we combine polarization-resolved ultrafast optical spectroscopy and state-of-the-art dynamical mean-field theory to show the importance of the crystal lattice in the breakdown of the correlated insulating state in an archetypal undoped cuprate. We identify signatures of electron–phonon coupling to specific fully symmetric optical modes during the buildup of a three-dimensional (3D) metallic state that follows charge photodoping. Calculations for coherently displaced crystal structures along the relevant phonon coordinates indicate that the insulating state is remarkably unstable toward metallization despite the seemingly large charge-transfer energy scale. This hitherto unobserved insulator-to-metal transition mediated by fully symmetric lattice modes can find extensive application in a plethora of correlated solids.
- Faculty
- Faculté des sciences et de médecine
- Department
- Département de Physique
- Language
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- English
- Classification
- Physics
- License
- License undefined
- Identifiers
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- RERO DOC 328315
- DOI 10.1073/pnas.1919451117
- Persistent URL
- https://folia.unifr.ch/unifr/documents/308595
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