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Ultrafast Hot Phonon Dynamics in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>MgB</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math> Driven by Anisotropic Electron-Phonon Coupling
The zone-center ${E}_{2g}$ modes play a crucial role in ${\mathrm{MgB}}_{2}$, 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 …