Pump Frequency Resonances for Light-Induced Incipient Superconductivity in YBa_{2}Cu_{3}O_{6.5}

Optical excitation in the cuprates has been shown to induce transient superconducting correlations above the thermodynamic transition temperature T_{C}, as evidenced by the terahertz-frequency optical properties in the nonequilibrium state. In YBa_{2}Cu_{3}O_{6+x}, this phenomenon has so far been as...
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Autor*in:	B. Liu [verfasserIn] M. Först [verfasserIn] M. Fechner [verfasserIn] D. Nicoletti [verfasserIn] J. Porras [verfasserIn] T. Loew [verfasserIn] B. Keimer [verfasserIn] A. Cavalleri [verfasserIn]

Format:	E-Artikel
Sprache:	Englisch

Erschienen:	2020

Übergeordnetes Werk:	In: Physical Review X - American Physical Society, 2011, 10(2020), 1, p 011053
Übergeordnetes Werk:	volume:10 ; year:2020 ; number:1, p 011053

Links:	Link aufrufen Link aufrufen Link aufrufen Link aufrufen Journal toc

DOI / URN:	10.1103/PhysRevX.10.011053

Katalog-ID:	DOAJ062372564

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author	B. Liu
spellingShingle	B. Liu misc QC1-999 misc Physics Pump Frequency Resonances for Light-Induced Incipient Superconductivity in YBa_{2}Cu_{3}O_{6.5}
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topic_title	QC1-999 Pump Frequency Resonances for Light-Induced Incipient Superconductivity in YBa_{2}Cu_{3}O_{6.5}
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title	Pump Frequency Resonances for Light-Induced Incipient Superconductivity in YBa_{2}Cu_{3}O_{6.5}
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title_full	Pump Frequency Resonances for Light-Induced Incipient Superconductivity in YBa_{2}Cu_{3}O_{6.5}
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title_sort	pump frequency resonances for light-induced incipient superconductivity in yba_{2}cu_{3}o_{6.5}
callnumber	QC1-999
title_auth	Pump Frequency Resonances for Light-Induced Incipient Superconductivity in YBa_{2}Cu_{3}O_{6.5}
abstract	Optical excitation in the cuprates has been shown to induce transient superconducting correlations above the thermodynamic transition temperature T_{C}, as evidenced by the terahertz-frequency optical properties in the nonequilibrium state. In YBa_{2}Cu_{3}O_{6+x}, this phenomenon has so far been associated with the nonlinear excitation of certain lattice modes and the creation of new crystal structures. In other compounds, like La_{2−x}Ba_{x}CuO_{4}, similar effects were reported also for excitation at near-infrared frequencies, and were interpreted as a signature of the melting of competing orders. However, to date, it has not been possible to systematically tune the pump frequency widely in any one compound, to comprehensively compare the frequency-dependent photosusceptibility for this phenomenon. Here, we make use of a newly developed nonlinear optical device, which generates widely tunable high-intensity femtosecond pulses, to excite YBa_{2}Cu_{3}O_{6.5} throughout the entire optical spectrum (3–750 THz). In the far-infrared region (3–24 THz), signatures of nonequilibrium superconductivity are induced only for excitation of the 16.4- and 19.2-THz vibrational modes that drive c-axis apical oxygen atomic positions. For higher driving frequencies (25–750 THz), a second resonance is observed around the charge transfer band edge at approximately 350 THz. These findings highlight the importance of coupling to the electronic structure of the CuO_{2} planes, mediated either by a phonon or by charge transfer.
abstractGer	Optical excitation in the cuprates has been shown to induce transient superconducting correlations above the thermodynamic transition temperature T_{C}, as evidenced by the terahertz-frequency optical properties in the nonequilibrium state. In YBa_{2}Cu_{3}O_{6+x}, this phenomenon has so far been associated with the nonlinear excitation of certain lattice modes and the creation of new crystal structures. In other compounds, like La_{2−x}Ba_{x}CuO_{4}, similar effects were reported also for excitation at near-infrared frequencies, and were interpreted as a signature of the melting of competing orders. However, to date, it has not been possible to systematically tune the pump frequency widely in any one compound, to comprehensively compare the frequency-dependent photosusceptibility for this phenomenon. Here, we make use of a newly developed nonlinear optical device, which generates widely tunable high-intensity femtosecond pulses, to excite YBa_{2}Cu_{3}O_{6.5} throughout the entire optical spectrum (3–750 THz). In the far-infrared region (3–24 THz), signatures of nonequilibrium superconductivity are induced only for excitation of the 16.4- and 19.2-THz vibrational modes that drive c-axis apical oxygen atomic positions. For higher driving frequencies (25–750 THz), a second resonance is observed around the charge transfer band edge at approximately 350 THz. These findings highlight the importance of coupling to the electronic structure of the CuO_{2} planes, mediated either by a phonon or by charge transfer.
abstract_unstemmed	Optical excitation in the cuprates has been shown to induce transient superconducting correlations above the thermodynamic transition temperature T_{C}, as evidenced by the terahertz-frequency optical properties in the nonequilibrium state. In YBa_{2}Cu_{3}O_{6+x}, this phenomenon has so far been associated with the nonlinear excitation of certain lattice modes and the creation of new crystal structures. In other compounds, like La_{2−x}Ba_{x}CuO_{4}, similar effects were reported also for excitation at near-infrared frequencies, and were interpreted as a signature of the melting of competing orders. However, to date, it has not been possible to systematically tune the pump frequency widely in any one compound, to comprehensively compare the frequency-dependent photosusceptibility for this phenomenon. Here, we make use of a newly developed nonlinear optical device, which generates widely tunable high-intensity femtosecond pulses, to excite YBa_{2}Cu_{3}O_{6.5} throughout the entire optical spectrum (3–750 THz). In the far-infrared region (3–24 THz), signatures of nonequilibrium superconductivity are induced only for excitation of the 16.4- and 19.2-THz vibrational modes that drive c-axis apical oxygen atomic positions. For higher driving frequencies (25–750 THz), a second resonance is observed around the charge transfer band edge at approximately 350 THz. These findings highlight the importance of coupling to the electronic structure of the CuO_{2} planes, mediated either by a phonon or by charge transfer.
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title_short	Pump Frequency Resonances for Light-Induced Incipient Superconductivity in YBa_{2}Cu_{3}O_{6.5}
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