Sensing coherent phonon dynamics in solids with delayed even harmonics

• URL: http://arxiv.org/abs/2603.09156v1
• Date: Tue, 10 Mar 2026 03:46:02 GMT
• Title: Sensing coherent phonon dynamics in solids with delayed even harmonics
• Abstract summary: Even harmonics are a powerful ultrafast probe of phonon dynamics and electron-phonon interactions in solids.<n>We theoretically investigate how even harmonics reveal coherent phonon dynamics.<n>Our findings highlight the potential of even harmonics to elucidate microscopic effects in systems with dynamically broken symmetry.
• Score: 0.3149883354098941
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: High harmonics have emerged as a powerful ultrafast probe of phonon dynamics and electron-phonon interactions in solids, with most studies focusing on odd harmonics. Here, in a pump-probe setup with variable delay, we theoretically investigate how even harmonics reveal coherent phonon dynamics. If pump and probe pulses overlap temporally, the spatial interference effect resulting from a non-coaxial pump-probe setup suppresses harmonic yields. At longer delays, odd-harmonic yields oscillate in phase at the optical phonon frequency, whereas even harmonics exhibit order-dependent phase-shifted oscillations. We identify a responsive range of even harmonic orders, in which the delay of yield oscillations is highly sensitive to subtle features of phonon dynamics and electron-electron interactions. Our findings highlight the potential of even harmonics to elucidate microscopic effects in systems with dynamically broken inversion symmetry.

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