DOE OSTI · 3378247
Emergent surface resonance from charge density wave symmetry breaking in TiSe 2
Abstract
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, in this study, we show that charge density wave (CDW) symmetry breaking can yield surface states in 1T−TiSe 2 . Micro–angle-resolved photoemission spectroscopy (µ-ARPES) 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 𝑇 CDW 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.
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Yilmaz, Turgut [Xiamen University Malaysia, Sepeng (Malaysia); Univ. of Connecticut, Storrs, CT (United States)] (ORCID:0000000267358088), Ng, Yi Sheng [Xiamen University Malaysia, Sepeng (Malaysia)], Fiaz, Muhammad Awais [University of New Hampshire, Durham, NH (United States)] (ORCID:0009000648349502), Rajapitamahuni, Anil [SRM University-AP, Andhra Pradesh (SRMAP), Amaravati (India); University of Nebraska, Lincoln, NE (United States)] (ORCID:0000000330924258), Kundu, Asish K. [Brookhaven National Laboratory (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)] (ORCID:0000000321991053), Hollen, Shawna M. [University of New Hampshire, Durham, NH (United States)] (ORCID:0000000291587876), Sheverdyaeva, Polina M. [Consiglio Nazionale delle Ricerche (CNR), Trieste (Italy). Istituto di Struttura della Materia (CNR-ISM)] (ORCID:0000000242311638), Moras, Paolo [Consiglio Nazionale delle Ricerche (CNR), Trieste (Italy). Istituto di Struttura della Materia (CNR-ISM)] (ORCID:0000000277718737), Vobornik, Ivana [Consiglio Nazionale delle Ricerche (CNR), Trieste (Italy). Istituto Officina dei Materiali (CNR-IOM)] (ORCID:0000000199573535), Fujii, Jun [Consiglio Nazionale delle Ricerche (CNR), Trieste (Italy). Istituto Officina dei Materiali (CNR-IOM)], Ideta, Shinichiro [Hiroshima University (Japan)], Shimada, Kenya [Hiroshima University (Japan)] (ORCID:0000000219452352), Sinkovic, Boris [University of Connecticut, Storrs, CT (United States)] (ORCID:0000000227419114), Vescovo, Elio [Brookhaven National Laboratory (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)], Wang, Hui-Qiong [Xiamen University Malaysia, Sepeng (Malaysia)] (ORCID:0000000204953146), Zheng, Jin-Cheng [Xiamen University Malaysia, Sepeng (Malaysia)]. 2026-07-10. Emergent surface resonance from charge density wave symmetry breaking in TiSe 2. https://doi.org/10.1103/lsxz-7hbr
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