Importance of Nonadiabatic Effects in Kohn Anomalies in 1D Metals
(2025) Physical Review Letters — Vol. 135, n° 25 (2025)
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- Abstract
- Kohn anomalies are kinks or dips in phonon dispersions which are pronounced in low-dimensional materials. We investigate the effects of nonadiabatic phonon self-energy on Kohn anomalies in one-dimensional metals by developing a model that analyzes how the adiabatic phonon frequency, electron effective mass, and electron-phonon coupling strength influence phonon mode renormalization. We introduce an electron-phonon coupling strength threshold for low-temperature system instability, providing experimentalists with a tool to predict them. Finally, we validate the predictions of our model against first-principles calculations on a 4 Å-diameter carbon nanotube.
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Citations
Marazzi, E., Poncé, S., Charlier, J.-C., & Rignanese, G.-M. (2025). Importance of Nonadiabatic Effects in Kohn Anomalies in 1D Metals. Physical Review Letters, 135(25). https://doi.org/10.1103/x69r-8fw1 (Original work published 2025)