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Electron-Phonon-Driven Three-Dimensional Metallicity in an Insulating Cuprate

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Electron-Phonon-Driven Three-Dimensional Metallicity in an Insulating Cuprate. / Van Schilfgaarde, Mark.

In: Proceedings of the National Academy of Sciences of the United States of America, Vol. 117, No. 12, 24.03.2020, p. 6409-6416.

Research output: Contribution to journalArticle

Harvard

Van Schilfgaarde, M 2020, 'Electron-Phonon-Driven Three-Dimensional Metallicity in an Insulating Cuprate', Proceedings of the National Academy of Sciences of the United States of America, vol. 117, no. 12, pp. 6409-6416. https://doi.org/10.1073/pnas.1919451117

APA

Van Schilfgaarde, M. (2020). Electron-Phonon-Driven Three-Dimensional Metallicity in an Insulating Cuprate. Proceedings of the National Academy of Sciences of the United States of America, 117(12), 6409-6416. https://doi.org/10.1073/pnas.1919451117

Vancouver

Van Schilfgaarde M. Electron-Phonon-Driven Three-Dimensional Metallicity in an Insulating Cuprate. Proceedings of the National Academy of Sciences of the United States of America. 2020 Mar 24;117(12):6409-6416. https://doi.org/10.1073/pnas.1919451117

Author

Van Schilfgaarde, Mark. / Electron-Phonon-Driven Three-Dimensional Metallicity in an Insulating Cuprate. In: Proceedings of the National Academy of Sciences of the United States of America. 2020 ; Vol. 117, No. 12. pp. 6409-6416.

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@article{b120cdc3565243ec8f4448df8444c4c6,
title = "Electron-Phonon-Driven Three-Dimensional Metallicity in an Insulating Cuprate",
abstract = "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.",
keywords = "Cuprates, Electron-phonon coupling, Insulator-metal transition, Ultrafast optics",
author = "{Van Schilfgaarde}, Mark",
year = "2020",
month = mar,
day = "24",
doi = "https://doi.org/10.1073/pnas.1919451117",
language = "English",
volume = "117",
pages = "6409--6416",
journal = "Proceedings of the National Academy of Sciences of the United States of America",
issn = "0027-8424",
publisher = "National Academy of Sciences",
number = "12",

}

RIS (suitable for import to EndNote) Download

TY - JOUR

T1 - Electron-Phonon-Driven Three-Dimensional Metallicity in an Insulating Cuprate

AU - Van Schilfgaarde, Mark

PY - 2020/3/24

Y1 - 2020/3/24

N2 - 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.

AB - 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.

KW - Cuprates

KW - Electron-phonon coupling

KW - Insulator-metal transition

KW - Ultrafast optics

UR - http://www.scopus.com/inward/record.url?scp=85082298293&partnerID=8YFLogxK

U2 - https://doi.org/10.1073/pnas.1919451117

DO - https://doi.org/10.1073/pnas.1919451117

M3 - Article

VL - 117

SP - 6409

EP - 6416

JO - Proceedings of the National Academy of Sciences of the United States of America

JF - Proceedings of the National Academy of Sciences of the United States of America

SN - 0027-8424

IS - 12

ER -

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