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Condensed Matter > Materials Science
Title: Ultrafast Hot Phonon Dynamics in MgB$_2$ Driven by Anisotropic Electron-Phonon Coupling
(Submitted on 5 Apr 2019 (v1), last revised 30 Jan 2020 (this version, v2))
Abstract: The zone-center $E_{2g}$ modes play a crucial role in MgB$_2$, controlling the scattering mechanisms in the normal state as well the superconducting pairing. Here, we demonstrate via first-principles quantum-field theory calculations that, due to the anisotropic electron-phonon interaction, a $hot$-$phonon$ regime where the $E_{2g}$ phonons can achieve significantly larger effective populations than other modes, is triggered in MgB$_2$ by the interaction with an ultra-short laser pulse. Spectral signatures of this scenario in ultrafast pump-probe Raman spectroscopy are discussed in detail, revealing also a fundamental role of nonadiabatic processes in the optical features of the $E_{2g}$ mode.
Submission history
From: Dino Novko [view email][v1] Fri, 5 Apr 2019 13:38:43 GMT (494kb,AD)
[v2] Thu, 30 Jan 2020 10:06:19 GMT (990kb,AD)
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