Enhanced electron-phonon coupling in graphene with periodically distorted 
lattice

Pomarico, Enrico; Mitrano, Matteo; Bromberger, Hubertus; Sentef, M. A.; Al-Temimy, A.; Coletti, C.; Stöhr, A.; Link, S.; Starke, U.; Cacho, C.; Chapman, R.; Springate, E.; Cavalleri, Andrea; Gierz, Isabella

doi:10.1103/PhysRevB.95.024304

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Enhanced electron-phonon coupling in graphene with periodically distorted lattice

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Pomarico, Enrico
Quantum Condensed Matter Dynamics, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
Laboratory for Ultrafast Microscopy and Electron Scattering, Institute of Physics, Ecole Polytechnique Federale de Lausanne (EPFL);

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Mitrano, Matteo
Quantum Condensed Matter Dynamics, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
Department of Physics and Frederick Seitz Materials Research Laboratory, University of Illinois;

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Bromberger, Hubertus
Quantum Condensed Matter Dynamics, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;

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Sentef, M. A.
Theoretical Description of Pump-Probe Spectroscopies in Solids, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;

/persons/resource/persons133811

Cavalleri, Andrea
Quantum Condensed Matter Dynamics, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
Department of Physics, Clarendon Laboratory, University of Oxford, Oxford, United Kingdom;

/persons/resource/persons133795

Gierz, Isabella
Ultrafast Electron Dynamics, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;

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https://dx.doi.org/10.1103/PhysRevB.95.024304
(Publisher version)

https://arxiv.org/abs/1607.02314
(Preprint)

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cmd-2017-Pomarico-PhyRB.95.024304.pdf
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Citation

Pomarico, E., Mitrano, M., Bromberger, H., Sentef, M. A., Al-Temimy, A., Coletti, C., et al. (2017). Enhanced electron-phonon coupling in graphene with periodically distorted lattice. Physical Review B, 95(2): 024304. doi:10.1103/PhysRevB.95.024304.

Cite as: https://hdl.handle.net/11858/00-001M-0000-002B-0790-0

Abstract

Electron-phonon coupling directly determines the stability of cooperative order in solids, including
superconductivity, charge, and spin density waves. Therefore, the ability to enhance or reduce electron-phonon
coupling by optical driving may open up new possibilities to steer materials’ functionalities, potentially at high
speeds. Here, we explore the response of bilayer graphene to dynamical modulation of the lattice, achieved by
driving optically active in-plane bond stretching vibrations with femtosecond midinfrared pulses. The driven state
is studied by two different ultrafast spectroscopic techniques. First, terahertz time-domain spectroscopy reveals
that the Drude scattering rate decreases upon driving. Second, the relaxation rate of hot quasiparticles, as measured
by time- and angle-resolved photoemission spectroscopy, increases. These two independent observations are
quantitatively consistent with one another and can be explained by a transient threefold enhancement of the
electron-phonon coupling constant. The findings reported here provide useful perspective for related experiments,
which reported the enhancement of superconductivity in alkali-doped fullerites when a similar phonon mode was
driven.