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    Real-Time Observation of Phonon-Mediated σ-π Interband Scattering in MgB2

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    1701.04795v1.pdf
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    Genre
    Journal Article
    Date
    2017-08-31
    Author
    Baldini, E
    Mann, A
    Benfatto, L
    Cappelluti, E
    Acocella, A
    Silkin, VM
    Eremeev, SV
    Kuzmenko, AB
    Borroni, S
    Tan, T
    Xi, XX
    Zerbetto, F
    Merlin, R
    Carbone, F
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    Subject
    cond-mat.supr-con
    cond-mat.supr-con
    Permanent link to this record
    http://hdl.handle.net/20.500.12613/5683
    
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    DOI
    10.1103/PhysRevLett.119.097002
    Abstract
    © 2017 American Physical Society. In systems having an anisotropic electronic structure, such as the layered materials graphite, graphene, and cuprates, impulsive light excitation can coherently stimulate specific bosonic modes, with exotic consequences for the emergent electronic properties. Here we show that the population of E2g phonons in the multiband superconductor MgB2 can be selectively enhanced by femtosecond laser pulses, leading to a transient control of the number of carriers in the σ-electronic subsystem. The nonequilibrium evolution of the material optical constants is followed in the spectral region sensitive to both the a- and c-axis plasma frequencies and modeled theoretically, revealing the details of the σ-π interband scattering mechanism in MgB2.
    Citation to related work
    American Physical Society (APS)
    Has part
    Physical Review Letters
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    ae974a485f413a2113503eed53cd6c53
    http://dx.doi.org/10.34944/dspace/5665
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