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Condensed Matter > Materials Science
Title: Fingerprints of Ultrafast Hot Phonon Dynamics in MgB$_2$
(Submitted on 5 Apr 2019 (this version), latest version 30 Jan 2020 (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. In this Letter, we demonstrate via first-principles quantum-field theory calculations that, due to remarkably anisotropic electron-phonon interactions, a $\textit{hot-phonon}$ regime where the $E_{2g}$ phonons exhibit a higher effective temperature 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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