Fingerprints of hot-phonon physics in time-resolved correlated quantum lattice dynamics
Emmanuele Cappelluti, Dino Novko
SciPost Phys. 12, 173 (2022) · published 24 May 2022
- doi: 10.21468/SciPostPhys.12.5.173
- Submissions/Reports
Abstract
The time dynamics of the energy flow from electronic to lattice degrees of freedom in pump-probe setups could be strongly affected by the presence of a hot-phonon bottleneck, which can sustain longer coherence of the optically excited electronic states. Recently, hot-phonon physics has been experimentally observed and theoretically described in MgB$_2$, the electron-phonon based superconductor with $T_{\rm c}\approx 39$ K. By employing a combined ab-initio and quantum-field-theory approach and by taking MgB$_2$ as an example, here we propose a novel path for revealing the presence and characterizing the properties of hot phonons through a direct analysis of the information encoded in the lattice inter-atomic correlations. Such method exploits the underlying symmetry of the $E_{2g}$ hot modes characterized by a out-of-phase in-plane motion of the two boron atoms. Since hot phonons occur typically at high-symmetry points of the Brillouin zone, with specific symmetries of the lattice displacements, the present analysis is quite general and it could aid in revealing the hot-phonon physics in other promising materials, such as graphene, boron nitride, or black phosphorus.
Cited by 3
Authors / Affiliations: mappings to Contributors and Organizations
See all Organizations.- 1 Emmanuele Cappelluti,
- 2 3 Dino Novko
- 1 Istituto di Struttura della Materia / Institute of Structure of Matter [CNR-ISM]
- 2 Donostia International Physics Center [DIPC]
- 3 Institute of Physics of the Czech Academy of Sciences [FZU]
- European Regional Development Fund [ERDF]
- Hrvatska Zaklada za Znanost (through Organization: Hrvatska zaklada za znanost / Croatian Science Foundation [HRZZ])