Coherent generation of symmetry-forbidden phonons by light-induced electron-phonon interactions in magnetite

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989100%3A27740%2F17%3A10237794" target="_blank" >RIV/61989100:27740/17:10237794 - isvavai.cz</a>
Result on the web
<a href="https://journals.aps.org/prb/abstract/10.1103/PhysRevB.96.104308" target="_blank" >https://journals.aps.org/prb/abstract/10.1103/PhysRevB.96.104308</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1103/PhysRevB.96.104308" target="_blank" >10.1103/PhysRevB.96.104308</a>

Result language
angličtina
Original language name
Coherent generation of symmetry-forbidden phonons by light-induced electron-phonon interactions in magnetite
Original language description
Symmetry breaking across phase transitions often causes changes in selection rules and emergence of optical modes which can be detected via spectroscopic techniques or generated coherently in pump-probe experiments. In second-order or weakly first-order transitions, fluctuations of the ordering field are present above the ordering temperature, giving rise to intriguing precursor phenomena, such as critical opalescence. Here, we demonstrate that in magnetite (Fe3O4) light excitation couples to the critical fluctuations of the charge order and coherently generates structural modes of the ordered phase above the critical temperature of the Verwey transition. Our findings are obtained by detecting coherent oscillations of the optical constants through ultrafast broadband spectroscopy and analyzing their dependence on temperature. To unveil the coupling between the structural modes and the electronic excitations, at the origin of the Verwey transition, we combine our results from pump-probe experiments with spontaneous Raman scattering data and theoretical calculations of both the phonon dispersion curves and the optical constants. Our methodology represents an effective tool to study the real-time dynamics of critical fluctuations across phase transitions.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10302 - Condensed matter physics (including formerly solid state physics, supercond.)

Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2017
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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