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  Electronic-structural dynamics in graphene

Gierz, I., & Cavalleri, A. (2016). Electronic-structural dynamics in graphene. Structural Dynamics, 3(5): 051301. doi:10.1063/1.4964777.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002B-21C1-5 Version Permalink: http://hdl.handle.net/21.11116/0000-0004-93F1-5
Genre: Journal Article

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2016
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http://arxiv.org/abs/1608.02750 (Preprint)
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http://dx.doi.org/10.1063/1.4964777 (Publisher version)
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 Creators:
Gierz, Isabella1, 2, Author              
Cavalleri, Andrea2, 3, 4, Author              
Affiliations:
1Ultrafast Electron Dynamics, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_1938295              
2Center for Free-Electron Laser Science, 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, ou_persistent22              

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Free keywords: Condensed Matter; Materials Science; Mesoscale and Nanoscale Physics; Graphene; Phonons; Conduction bands; Ionization; Band structure
 Abstract: We review our recent time- and angle-resolved photoemission spectroscopy experiments, which measure the transient electronic structure of optically driven graphene. For pump photon energies in the near infrared (ℏωpump = 950 meV), we have discovered the formation of a population-inverted state near the Dirac point, which may be of interest for the design of THz lasing devices and optical amplifiers. At lower pump photon energies (ℏωpump < 400 meV), for which interband absorption is not possible in doped samples, we find evidence for free carrier absorption. In addition, when mid-infrared pulses are made resonant with an infrared-active in-plane phonon of bilayer graphene (ℏωpump = 200 meV), a transient enhancement of the electron-phonon coupling constant is observed, providing interesting perspective for experiments that report light-enhanced superconductivity in doped fullerites in which a similar lattice mode was excited. All the studies reviewed here have important implications for applications of graphene in optoelectronic devices and for the dynamical engineering of electronic properties with light.

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Language(s): eng - English
 Dates: 2016-08-092016-08-092016-09-302016-10-17
 Publication Status: Published online
 Pages: 8
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: arXiv: 1608.02750
DOI: 10.1063/1.4964777
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Title: Structural Dynamics
Source Genre: Journal
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Publ. Info: Melville, NY : American Institute of Physics
Pages: - Volume / Issue: 3 (5) Sequence Number: 051301 Start / End Page: - Identifier: Other: 2329-7778
CoNE: https://pure.mpg.de/cone/journals/resource/2329-7778