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

Published inPhysical review letters, vol. 119, no. 9, 097002
Publication date2017-08-31
First online date2017-08-31

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.

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BALDINI, E. et al. Real-Time Observation of Phonon-Mediated σ − π Interband Scattering in MgB<sub>2</sub>. In: Physical review letters, 2017, vol. 119, n° 9, p. 097002. doi: 10.1103/PhysRevLett.119.097002
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ISSN of the journal0031-9007

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