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  Transiently enhanced interlayer tunneling in optically driven high-Tc superconductors

Okamoto, J., Hu, W., Cavalleri, A., & Mathey, L. (2017). Transiently enhanced interlayer tunneling in optically driven high-Tc superconductors. Physical Review B, 96(14), 144505. doi:10.1103/PhysRevB.96.144505.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002E-7740-6 Version Permalink: http://hdl.handle.net/21.11116/0000-0003-2250-C
Genre: Journal Article

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 Creators:
Okamoto, J.1, 2, Author
Hu, Wanzheng3, Author              
Cavalleri, A.3, 4, Author              
Mathey, L.1, 2, Author
Affiliations:
1Zentrum für Optische Quantentechnologien and Institut für Laserphysik, Universität Hamburg, 22761 Hamburg, Germany, ou_persistent22              
2The Hamburg Centre for Ultrafast Imaging, Luruper Chaussee 149, 22761 Hamburg, Germany, ou_persistent22              
3Quantum Condensed Matter Dynamics, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_1938293              
4Department of Physics, Clarendon Laboratory, University of Oxford, Oxford OX1 3PU, United Kingdom, ou_persistent22              

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 Abstract: Recent pump-probe experiments reported an enhancement of superconducting transport along the c axis of underdoped YBa2Cu3O6+δ (YBCO), induced by a midinfrared optical pump pulse tuned to a specific lattice vibration. To understand this transient nonequilibrium state, we develop a pump-probe formalism for a stack of Josephson junctions, and we consider the tunneling strengths in the presence of modulation with an ultrashort optical pulse. We demonstrate that a transient enhancement of the Josephson coupling can be obtained for pulsed excitation and that this can be even larger than in a continuously driven steady state. Especially interesting is the conclusion that the effect is largest when the material is parametrically driven at a frequency immediately above the plasma frequency, in agreement with what is found experimentally. For bilayer Josephson junctions, an enhancement similar to that experimentally is predicted below the critical temperature Tc. This model reproduces the essential features of the enhancement measured below Tc. To reproduce the experimental results above Tc, we will explore extensions of this model, such as in-plane and amplitude fluctuations, elsewhere.

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Language(s): eng - English
 Dates: 2017-10-10
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1103/PhysRevB.96.144505
arXiv: 1706.04554
 Degree: -

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Project name : We acknowledge the support from the Deutsche Forschungsgemeinschaft (through SFB 925 and EXC 1074) and from the Landesexzellenzinitiative Hamburg, which is supported by the Joachim Herz Stiftung. J.O. thanks S. A. Sato for helpful discussions about details of the pump-probe formalism.
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Title: Physical Review B
  Alternative Title : Phys. Rev. B
Source Genre: Journal
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Publ. Info: American Physical Society
Pages: - Volume / Issue: 96 (14) Sequence Number: - Start / End Page: 144505 Identifier: -