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  Optically induced coherent transport far above Tc in underdoped YBa2Cu3O6+δ

Kaiser, S., Hunt, C. R., Nicoletti, D., Hu, W., Gierz, I., Liu, H., et al. (2014). Optically induced coherent transport far above Tc in underdoped YBa2Cu3O6+δ . Phys. Rev. B, 89(18): 184516. doi:10.1103/PhysRevB.89.184516.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-001A-3382-D Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0028-2D5C-9
Genre: Journal Article

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PhysRevB.89.184516.pdf (Publisher version), 3MB
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http://dx.doi.org/10.1103/PhysRevB.89.184516 (Publisher version)
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http://arxiv.org/abs/1205.4661 (Preprint)
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 Creators:
Kaiser, Stefan1, Author              
Hunt, Cassandra R.1, 2, Author              
Nicoletti, Daniele1, Author              
Hu, Wanzheng1, Author              
Gierz, Isabella3, Author              
Liu, Haiyun1, Author              
Le Tacon, M.4, Author
Loew, T.4, Author
Haug, D.4, Author
Keimer, B.4, Author
Cavalleri, Andrea1, 5, Author              
Affiliations:
1Quantum Condensed Matter Dynamics, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, Luruper Chaussee 149, Geb. 99 (CFEL), 22761 Hamburg, DE, ou_1938293              
2Department of Physics, University of Illinois at Urbana-Champaign, Urbana, Illinois, USA, ou_persistent22              
3Ultrafast Electron Dynamics, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, Luruper Chaussee 149, Geb. 99 (CFEL), 22761 Hamburg, DE, ou_1938295              
4Max Planck Institute for Solid State Research, Stuttgart, Germany, ou_persistent22              
5Department of Physics, Oxford University, Clarendon Laboratory, Oxford, United Kingdom, ou_persistent22              

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Free keywords: PACS numbers: 74.25.N−, 74.25.Gz, 74.72.−h, 74.81.−g
 Abstract: We report on a photoinduced transient state of YBa2Cu3O6+δ in which transport perpendicular to the Cu-O planes becomes highly coherent. This effect is achieved by excitation with mid-infrared optical pulses, tuned to the resonant frequency of apical oxygen vibrations, which modulate both lattice and electronic properties. Below the superconducting transition temperature Tc, the equilibrium signatures of superconducting interlayer coupling are enhanced. Most strikingly, the optical excitation induces a new reflectivity edge at higher frequency than the equilibrium Josephson plasma resonance, with a concomitant enhancement of the low-frequency imaginary conductivity σ2(ω). Above Tc, the incoherent equilibrium conductivity becomes highly coherent, with the appearance of a reflectivity edge and a positive σ2(ω) that increases with decreasing frequency. These features are observed up to room temperature in YBa2Cu2O6.45 and YBa2Cu2O6.5. The data above Tc can be fitted by hypothesizing that the light establishes a transient superconducting state over only a fraction of the solid, with a lifetime of a few picoseconds. Non-superconducting transport could also explain these observations, although one would have to assume transient carrier mobilities near 104 cm2/V sec at 100 K, with a density of charge carriers similar to the below-Tc superfluid density. Our results are indicative of highly unconventional nonequilibrium physics and open new prospects for optical control of complex solids.

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Language(s): eng - English
 Dates: 2014-04-252014-03-182014-05-302014-05
 Publication Status: Published in print
 Pages: 9
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1103/PhysRevB.89.184516
BibTex Citekey: PhysRevB.89.184516
arXiv: 1205.4661
 Degree: -

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Title: Phys. Rev. B
Source Genre: Journal
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Publ. Info: American Physical Society
Pages: - Volume / Issue: 89 (18) Sequence Number: 184516 Start / End Page: - Identifier: -