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• W2263160690 abstract "Impulsive optical excitation can generate both coherent and squeezed phonons. The expectation value of the phonon displacement $<u_q>$ oscillates at the mode frequency for the coherent state but remains zero for a pure squeezed state. In contrast, both show oscillations in $<|u_q|^2>$ at twice the mode frequency. Therefore it can be difficult to distinguish them in a second-order measurement of the displacements, such as in first-order x-ray diffuse scattering. Here we demonstrate a simple method to distinguish squeezed from coherent atomic motion by measurement of the diffuse scattering following double impulsive excitation. We find that femtosecond optical excitation generates squeezed phonons spanning the Brillouin zone in Ge, GaAs and InSb. Our results confirm the mechanism suggested in [Nature Physics 9, 790 (2013)]." @default.
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• W2263160690 date "2016-07-20" @default.
• W2263160690 modified "2023-10-14" @default.
• W2263160690 title "Control of two-phonon correlations and the mechanism of high-wavevector phonon generation by ultrafast light pulses" @default.
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• W2263160690 doi "https://doi.org/10.1103/physrevb.94.020302" @default.
• W2263160690 hasPublicationYear "2016" @default.
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