Relaxation timescales and electron-phonon coupling in optically-pumped YBa$_2$Cu$_3$O$_{6+x}$ revealed by time-resolved Raman scattering

Pellatz, N.; Roy, S.; Lee, J-W.; Schad, J. L.; Kandel, H.; Arndt, N.; Eom, C. B.; Kemper, A. F.; Reznik, D.

doi:10.48550/arxiv.2010.15958

Cited by 1 publication

(1 citation statement)

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“…On the other hand, since a hot phonon is an object defined by its bosonic population which is a property logically independent of the electronphonon coupling, it looks more natural devising and employing, when possible, techniques that are based on the analysis of purely lattice features. Along this perspective, considered that hot phonons are usually located at high-symmetry points of the Brillouin zone, and in particularly at the zone-center, a popular tool is the analysis, when feasible, of the relative intensity of the Stokes and anti-Stokes peaks in Raman spectroscopy [81,82,88,113,162,164,172,173]. The Stokes and anti-Stokes intensity for a q = 0 Raman active mode ν, I S , I aS , respectively, are indeed known to be governed by the population of the Raman mode:…”

Section: Detecting Hot Phononsmentioning

confidence: 99%

Properties and challenges of hot-phonon physics in metals: MgB$_2$ and other compounds

Cappelluti,

Caruso,

Novko

2022

Preprint

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The ultrafast dynamics of electrons and collective modes in systems out of equilibrium is crucially governed by the energy transfer from electronic degrees of freedom, where the energy of the pump source is usually absorbed, to lattice degrees of freedom. In conventional metals such process leads to an overall heating of the lattice, usually described by an effective lattice temperature T ph , until final equilibrium with all the degrees of freedom is reached. In specific materials, however, few lattice modes provide a preferential channel for the energy transfer, leading to a non-thermal distribution of vibrations and to the onset of hot phonons, i.e., lattice modes with a much higher population than the other modes. Hot phonons are usually encountered in semiconductors or semimetal compounds, like graphene, where the preferential channel towards hot modes is dictated by the reduced electronic phase space. Following a different path, the possibility of obtaining hot-phonon physics also in metals has been however also recently prompted in literature, as a result of a strong anisotropy of the electron-phonon (el-ph) coupling. In the present paper, taking MgB 2 as a representative example, we review the physical conditions that allow a hot-phonon scenario in metals with anisotropic el-ph coupling, and we discuss the observable fingerprints of hot phonons. Novel perspectives towards the prediction and experimental observation of hot phonons in other metallic compounds are also discussed. Contents 1 Introduction 32 Energy transfer and relaxation processes in time-resolved pump-probe experiments 7

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