We explore the Fano resonance in ZrTe5, using Raman scattering measurements. We identified two closely spaced B2g phonon modes, B2g I and B2g II, around 9 meV and 10 meV, respectively. Interestingly, only B2g I exhibited the Fano resonance, an outcome of quantum interference between discrete phonon modes and continuous electronic excitations. This is consistent with the much stronger electron-phonon coupling of B2g I mode demonstrated by first-principles calculations. Additionally, temperature-dependent measurements highlight an enhanced Fano asymmetry at elevated temperatures, contributed by the thermal renormalization of the band structure and electron-phonon coupling. This study offers insights into the complex interrelation of electron-phonon coupling, thermal effects, and Fano resonances in ZrTe5.
@article{arxiv.2410.09920,
title = {Revealing Fano Resonance in Dirac Materials ZrTe5 through Raman Scattering},
author = {Di Cheng and Tao Jiang and Feng Zhang and Genda Gu and Liang Luo and Chuankun Huang and Boqun Song and Martin Mootz and Avinash Khatri and Joong-Mok Park and Qiang Li and Yongxin Yao and Jigang Wang},
journal= {arXiv preprint arXiv:2410.09920},
year = {2025}
}