تقرير
Ultrafast Hot Phonon Dynamics in MgB$_2$ Driven by Anisotropic Electron-Phonon Coupling
| العنوان: | Ultrafast Hot Phonon Dynamics in MgB$_2$ Driven by Anisotropic Electron-Phonon Coupling |
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| المؤلفون: | Novko, D., Caruso, F., Draxl, C., Cappelluti, E. |
| المصدر: | Phys. Rev. Lett. 124, 077001 (2020) |
| سنة النشر: | 2019 |
| المجموعة: | Condensed Matter |
| مصطلحات موضوعية: | Condensed Matter - Materials Science, Condensed Matter - Superconductivity |
| الوصف: | 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. Comment: Article as accepted for publication in Physical Review Letters; 6 pages, 3 figures |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1103/PhysRevLett.124.077001 |
| URL الوصول: | http://arxiv.org/abs/1904.03062 |
| رقم الأكسشن: | edsarx.1904.03062 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1103/PhysRevLett.124.077001 |
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