Charge-order states of broken symmetry, such as charge density wave (CDW), are able to induce exceptional physical properties, however, the precise understanding of the underlying physics is still elusive. Here, we combine fluctuational electrodynamics and density functional theory to reveal an unconventional thermophotonic effect in CDW-bearing TiSe2, referred to as thermophotonic-CDW (tp-CDW). The interplay of plasmon polariton and CDW electron excitations give rise to an anomalous negative temperature dependency in thermal photons transport, offering an intuitive fingerprint for a transformation of the electron order. Additionally, the demonstrated nontrivial features of tp-CDW transition hold promise for a controllable manipulation of heat flow, which could be extensively utilized in various fields such as thermal science and electron dynamics, as well as in next-generation energy devices.
@article{arxiv.2408.03698,
title = {Unconventional Thermophotonic Charge Density Wave},
author = {Cheng-Long Zhou and Zahra Torbatian and Shui-Hua Yang and Yong Zhang and Hong-Liang Yi and Mauro Antezza and Dino Novko and Cheng-Wei Qiu},
journal= {arXiv preprint arXiv:2408.03698},
year = {2024}
}