Fluctuations of the atomic positions are at the core of a large class of unusual material properties ranging from quantum para-electricity to high temperature superconductivity. Their measurement in solids is the subject of an intense scientific debate focused on seeking a methodology capable of establishing a direct link between the variance of the atomic displacements and experimentally measurable observables. Here we address this issue by means of non-equilibrium optical experiments performed in shot-noise limited regime. The variance of the time dependent atomic positions and momenta is directly mapped into the quantum fluctuations of the photon number of the scattered probing light. A fully quantum description of the non-linear interaction between photonic and phononic fields is benchmarked by unveiling the squeezing of thermal phonons in $alpha$-quartz.

Photon number statistics uncover the fluctuations in non-equilibrium lattice dynamics

ESPOSITO, MARTINA;ZIMMERMANN, KLAUS;GIUSTI, FRANCESCA;RANDI, FRANCESCO;PARMIGIANI, FULVIO;FLOREANINI, ROBERTO;BENATTI, FABIO;FAUSTI, DANIELE
2015

Abstract

Fluctuations of the atomic positions are at the core of a large class of unusual material properties ranging from quantum para-electricity to high temperature superconductivity. Their measurement in solids is the subject of an intense scientific debate focused on seeking a methodology capable of establishing a direct link between the variance of the atomic displacements and experimentally measurable observables. Here we address this issue by means of non-equilibrium optical experiments performed in shot-noise limited regime. The variance of the time dependent atomic positions and momenta is directly mapped into the quantum fluctuations of the photon number of the scattered probing light. A fully quantum description of the non-linear interaction between photonic and phononic fields is benchmarked by unveiling the squeezing of thermal phonons in $alpha$-quartz.
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https://www.nature.com/articles/ncomms10249
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11368/2861180
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