Coherent lattice dynamics distinguish Holstein and Su-Schrieffer-Heeger electron-phonon coupling
Abstract
Ultrafast pump-probe spectroscopy provides a powerful means to investigate electron-phonon (e-ph) interactions in strongly correlated systems. Nevertheless, the question of how different microscopic e-ph coupling mechanisms influence the lattice's nonequilibrium response has not been widely addressed. We perform time-dependent density matrix renormalization group simulations on a pumped one-dimensional Mott insulator coupled to phonons through either Holstein or Su-Schrieffer-Heeger (SSH) interactions. The electronic responses of the two models are qualitatively similar in the Mott-insulating regime and are governed by the same excitations and resonance conditions of the Hubbard model. In contrast, the lattice dynamics of the two models differ substantially. While the Hubbard-Holstein model exhibits long-lived coherent phonon oscillations when the pump resonates with the bare phonon frequency, no such oscillations are observed for the Hubbard-SSH model. These contrasting responses remain robust against changes in phonon frequency and pump parameters, suggesting that coherent lattice dynamics can provide a direct nonequilibrium probe of the microscopic form of e-ph coupling.
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BibTeX
@misc{banerjee2026coherent,
title = {{Coherent lattice dynamics distinguish Holstein and Su-Schrieffer-Heeger electron-phonon coupling}},
author = {Debshikha Banerjee and Jinu Thomas and G. Alvarez and T. P. Devereaux and T. A. Maier and S. Johnston},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.25418},
eprint = {2609.25418},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.25418},
}
RIS
TY - UNPB
TI - Coherent lattice dynamics distinguish Holstein and Su-Schrieffer-Heeger electron-phonon coupling
AU - Debshikha Banerjee
AU - Jinu Thomas
AU - G. Alvarez
AU - T. P. Devereaux
AU - T. A. Maier
AU - S. Johnston
PY - 2026
DA - 2026/09/21
PB - arXiv
DO - 10.48550/arxiv.2609.25418
UR - https://arxiv.org/abs/2609.25418
AB - Ultrafast pump-probe spectroscopy provides a powerful means to investigate electron-phonon (e-ph) interactions in strongly correlated systems. Nevertheless, the question of how different microscopic e-ph coupling mechanisms influence the lattice's nonequilibrium response has not been widely addressed. We perform time-dependent density matrix renormalization group simulations on a pumped one-dimensional Mott insulator coupled to phonons through either Holstein or Su-Schrieffer-Heeger (SSH) interactions. The electronic responses of the two models are qualitatively similar in the Mott-insulating regime and are governed by the same excitations and resonance conditions of the Hubbard model. In contrast, the lattice dynamics of the two models differ substantially. While the Hubbard-Holstein model exhibits long-lived coherent phonon oscillations when the pump resonates with the bare phonon frequency, no such oscillations are observed for the Hubbard-SSH model. These contrasting responses remain robust against changes in phonon frequency and pump parameters, suggesting that coherent lattice dynamics can provide a direct nonequilibrium probe of the microscopic form of e-ph coupling.
ER -