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arXiv · 2410.09920

Revealing Fano Resonance in Dirac Materials ZrTe5 through Raman Scattering

Di Cheng·Tao Jiang·Feng Zhang·Genda Gu·Liang Luo·Chuankun Huang·Boqun Song·Martin Mootz·Avinash Khatri·Joong-Mok Park·Qiang Li·Yongxin Yao·Jigang Wang
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Abstract

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.

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Di Cheng, Tao Jiang, Feng Zhang, Genda Gu, Liang Luo, Chuankun Huang, Boqun Song, Martin Mootz, Avinash Khatri, Joong-Mok Park, Qiang Li, Yongxin Yao, Jigang Wang. 2024-10-13. Revealing Fano Resonance in Dirac Materials ZrTe5 through Raman Scattering. https://arxiv.org/abs/2410.09920

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