Surface confined electronic states provide a fertile ground for discovering emergent phenomena that have no counterpart in the bulk, offering new routes to manipulate correlations, symmetry breaking, and dimensionality at the atomic scale. Here, we show that charge density wave (CDW) symmetry breaking can yield a surface states in 1T-TiSe2. Micro angle resolved photoemission spectroscopy resolves a sharp, two dimensional surface resonant state (SRS) that emerges within the CDW reconstructed low energy spectrum. The SRS exhibits notable temperature dependence and its spectral weight collapses around 160 K, while CDW transition temperature TCDW is commonly reported as 202 K. Slab DFT+U calculations reproduce a surface localized resonance when CDW folding brings valence and conduction states into near degeneracy, suggesting a correlation tuned, surface selective origin. These results point to a form of correlation-tuned surface resonance in a layered CDW compound and suggest a framework for engineering low dimensional quantum states in van der Waals materials via symmetry breaking and electronic structure tuning.
@article{arxiv.2604.26685,
title = {Emergent surface resonance from charge density wave symmetry breaking in TiSe2},
author = {Turgut Yilmaz and Yi Sheng Ng and Muhammad Awais Fiaz and Anil Rajapitamahuni and Asish K. Kundu and Shawna M. Hollen and Polina M. Sheverdyaeva and Paolo Moras and Ivana Vobornik and Jun Fujii and Shinichiro Ideta and Kenya Shimada and Boris Sinkovic and Elio Vescovo and Hui-Qiong Wang and Jin-Cheng Zheng},
journal= {arXiv preprint arXiv:2604.26685},
year = {2026}
}