Presentation Information
[2G10]Magnetic-Field-Induced Dimensional Crossover of Charge Density Waves on a Strained 2H-NbSe2 Surface
*Ryo Ichikawa1, Yukiko K Takahashi2, Eiichi Inami3, Toyo Kazu Yamada1,4 (1. Department of Material Science, Chiba university, 1-33 Yayoi-Cho, Inage-ku, Chiba 263-8522, Japan, 2. Research Center for Magnetic and Spintronic materials, National Institute for Material Science, Tsukuba, Japan, 3. School of Systems Engineering, Kochi University of Technology, 185 Miyanokuchi, Tosavamada, Kami, Kochi 782-8502, Japan, 4. Molecular Chirality Research Centre, Chiba University, 1-33 Yayoi-Cho, Inage-ku, Chiba 263-8522, Japan)
We show that surface monolayer films of 2H-NbSe2 are easily distorted by external forces [1], causing bending and increased strain. Using UHV-STM/STS at 4.3 K with SEM/TEM, we find that strained films primarily exhibit a 2×2 charge density wave (CDW) pattern, unlike the typical 3×3 CDW seen after vacuum tape cleavage. This 2×2 CDW is highly sensitive to external fields and transitions to a 1Q phase as its energy range narrows. These results highlight how strain from thinning or wire-bonding can significantly affect the electronic properties of ultrathin NbSe2, with implications for device applications. [1] Ichikawa, Yamada, et al., npj 2D Materials and Applications, 9, 59 (2025).