Modulating Charge-Density Wave Order and Superconductivity from Two Alternative Stacked Monolayers in a Bulk 4<i>Hb</i>-TaSe<sub>2</sub> Heterostructure via Pressure
Limin Yan, Chi Ding, Mingtao Li, Ruilian Tang, Wan Chen, B. Liu, Kejun Bu, Tianheng Huang, Dongzhe Dai, Xiaobo Jin, Xiaofan Yang, Erjian Cheng, Nana Li, Qian Zhang, Feng‐Liang Liu, Xuqiang Liu, Dongzhou Zhang, Shuailing Ma, Qiang Tao, Pinwen Zhu, Shiyan Li, Xujie Lü, Jian Sun, Xin Wang, Wenge Yang
Abstract
Two-dimensional (2D) van der Waals heterostructures (VDWHs) containing a charge-density wave (CDW) and superconductivity (SC) have revealed rich tunability in their properties, which provide a new route for optimizing their novel exotic states. The interaction between SC and CDW is critical to its properties; however, understanding this interaction within VDWHs is very limited. A comprehensive in situ study and theoretical calculation on bulk 4 Hb -TaSe 2 VDWHs consisting of alternately stacking 1 T -TaSe 2 and 1 H -TaSe 2 monolayers are investigated under high pressure. Surprisingly, the superconductivity competes with the intralayer and adjacent-layer CDW order in 4 Hb -TaSe 2, which results in substantially and continually boosted superconductivity under compression. Upon total suppression of the CDW, the superconductivity in the individual layers responds differently to the charge transfer. Our results provide an excellent method to efficiently tune the interplay between SC and CDW in VDWHs and a new avenue for designing materials with tailored properties.