In solids, the response of the lattice to photoexcitation is often described by the inertial evolution on an impulsively modified potential energy surface which leads to coherent motion. However, it remains unknown if vibrational coherence is sustained through a phase transition, during which coupling between modes can be strong and may lead to rapid loss of coherence. Here we use coherent phonon spectroscopy to track lattice coherence in the structural phase transition of V2O3. In both the low and high symmetry phases unique coherent phonon modes are generated at low fluence. However, coherence is lost when driving between the low and high symmetry phases. Our results suggest strongly damped noninertial dynamics dominate during the phase transition due to disorder and multimode coupling.

Johnson, A. S., Moreno-Mencía, D., Amuah, E. B., Menghini, M., Locquet, J. P., Giannetti, C., Pastor, E., Wall, S. E., Ultrafast Loss of Lattice Coherence in the Light-Induced Structural Phase Transition of V2O3, <<PHYSICAL REVIEW LETTERS>>, 2022; 129 (25): N/A-N/A. [doi:10.1103/PhysRevLett.129.255701] [https://hdl.handle.net/10807/231308]

Ultrafast Loss of Lattice Coherence in the Light-Induced Structural Phase Transition of V2O3

Giannetti, Claudio;
2022

Abstract

In solids, the response of the lattice to photoexcitation is often described by the inertial evolution on an impulsively modified potential energy surface which leads to coherent motion. However, it remains unknown if vibrational coherence is sustained through a phase transition, during which coupling between modes can be strong and may lead to rapid loss of coherence. Here we use coherent phonon spectroscopy to track lattice coherence in the structural phase transition of V2O3. In both the low and high symmetry phases unique coherent phonon modes are generated at low fluence. However, coherence is lost when driving between the low and high symmetry phases. Our results suggest strongly damped noninertial dynamics dominate during the phase transition due to disorder and multimode coupling.
2022
Inglese
Johnson, A. S., Moreno-Mencía, D., Amuah, E. B., Menghini, M., Locquet, J. P., Giannetti, C., Pastor, E., Wall, S. E., Ultrafast Loss of Lattice Coherence in the Light-Induced Structural Phase Transition of V2O3, <<PHYSICAL REVIEW LETTERS>>, 2022; 129 (25): N/A-N/A. [doi:10.1103/PhysRevLett.129.255701] [https://hdl.handle.net/10807/231308]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10807/231308
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