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  Theory of light-enhanced phonon-mediated superconductivity

Sentef, M. A., Kemper, A. F., Georges, A., & Kollath, C. (2016). Theory of light-enhanced phonon-mediated superconductivity. Physical Review B, 93(14): 144506. doi:10.1103/PhysRevB.93.144506.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0028-4EAA-D Version Permalink: http://hdl.handle.net/21.11116/0000-0004-915C-1
Genre: Journal Article

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PhysRevB.93.144506.pdf (Publisher version), 945KB
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2016
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© American Physical Society

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Locator:
http://arxiv.org/abs/1505.07575 (Preprint)
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Locator:
http://dx.doi.org/10.1103/PhysRevB.93.144506 (Publisher version)
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 Creators:
Sentef, Michael A.1, 2, 3, Author              
Kemper, A. F.4, 5, Author
Georges, A.6, 7, 8, Author
Kollath, C.1, Author
Affiliations:
1HISKP, University of Bonn, Nussallee 14-16, D-53115 Bonn, Germany, ou_persistent22              
2Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_2074320              
3Center for Free Electron Laser Science, 22761 Hamburg, Germany, ou_persistent22              
4Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720, USA, ou_persistent22              
5Department of Physics, North Carolina State University, Raleigh, North Carolina 27695, USA, ou_persistent22              
6Centre de Physique Théorique, École Polytechnique, CNRS, 91128 Palaiseau Cedex, France, ou_persistent22              
7Collège de France, 11 place Marcelin Berthelot, 75005 Paris, France, ou_persistent22              
8Department of Quantum Matter Physics, University of Geneva, 24 Quai Ernest-Ansermet, 1211 Geneva 4, Switzerland, ou_persistent22              

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Free keywords: Condensed Matter; Superconductivity
 Abstract: We investigate the dynamics of a phonon-mediated superconductor driven out of equilibrium. The electronic hopping amplitude is ramped down in time, resulting in an increased electronic density of states. The dynamics of the coupled electron-phonon model is investigated by solving Migdal-Eliashberg equations for the double-time Keldysh Green's functions. The increase of the density of states near the Fermi level leads to an enhancement of superconductivity when the system thermalizes to the new state at the same temperature. We provide a time- and momentum-resolved view on this thermalization process and show that it involves fast processes associated with single-particle scattering and much slower dynamics associated with the superconducting order parameter. The importance of electron-phonon coupling for the rapid enhancement and the efficient thermalization of superconductivity is demonstrated, and the results are compared to a BCS time-dependent mean-field approximation.

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Language(s): eng - English
 Dates: 2015-05-282016-03-092015-05-182016-04-082016-04-01
 Publication Status: Published in print
 Pages: 10
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: arXiv: 1505.07575
DOI: 10.1103/PhysRevB.93.144506
 Degree: -

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Title: Physical Review B
  Abbreviation : Phys. Rev. B
Source Genre: Journal
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Publ. Info: Woodbury, NY : American Physical Society
Pages: - Volume / Issue: 93 (14) Sequence Number: 144506 Start / End Page: - Identifier: ISSN: 1098-0121
CoNE: /journals/resource/954925225008