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  Light-enhanced electron-phonon coupling from nonlinear electron-phonon coupling

Sentef, M. A. (2017). Light-enhanced electron-phonon coupling from nonlinear electron-phonon coupling. Physical Review B, 95(20): 205111. doi:10.1103/PhysRevB.95.205111.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0001-9C74-D Version Permalink: http://hdl.handle.net/21.11116/0000-0002-A4AB-4
Genre: Journal Article

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PhysRevB.95.205111.pdf (Publisher version), 278KB
 
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https://dx.doi.org/10.1103/PhysRevB.95.205111 (Publisher version)
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 Creators:
Sentef, M. A.1, 2, Author              
Affiliations:
1Center for Free Electron Laser Science, ou_persistent22              
2Theoretical Description of Pump-Probe Spectroscopies in Solids, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_3012828              

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 Abstract: We investigate an exact nonequilibrium solution of a two-site electron-phonon model, where an infrared-active phonon that is nonlinearly coupled to the electrons is driven by a laser field. The time-resolved electronic spectrum shows coherence-incoherence spectral weight transfer, a clear signature of light-enhanced electron-phonon coupling. The present study is motivated by recent evidence for enhanced electron-phonon coupling in pump-probe terahertz and angle-resolved photoemission spectroscopy in bilayer graphene when driven near resonance with an infrared-active phonon mode [E. Pomarico et al., Phys. Rev. B 95, 024304 (2017)], and by a theoretical study suggesting that transient electronic attraction arises from nonlinear electron-phonon coupling [D. M. Kennes et al., Nat. Phys. 13, 479 (2017)]. We show that a linear scaling of light-enhanced electron-phonon coupling with the pump field intensity emerges, in accordance with a time-nonlocal self-energy based on a mean-field decoupling using quasiclassical phonon coherent states. Finally, we demonstrate that this leads to enhanced double occupancies in accordance with an effective electron-electron attraction. Our results suggest that materials with strong phonon nonlinearities provide an ideal playground to achieve light-enhanced electron-phonon coupling and possibly light-induced superconductivity.

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Language(s): eng - English
 Dates: 2017-02-132017-02-032017-05-082017-05-08
 Publication Status: Published in print
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 Rev. Method: Peer
 Identifiers: DOI: 10.1103/PhysRevB.95.205111
arXiv: 1702.00952
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Project name : Stimulating discussions with A. Cavalleri, M. Eckstein, M. Fechner, I. Gierz, D. Kennes, A. Millis, T. Oka, E. Pomarico, and A. Rubio are gratefully acknowledged. This work was financially supported by the DFG (Grant No. SE 2558/2-1) through the Emmy Noether program.
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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: 95 (20) Sequence Number: 205111 Start / End Page: - Identifier: ISSN: 1098-0121
CoNE: /journals/resource/954925225008