Yan Limin, Ding Chi, Li Mingtao, Tang Ruilian, Chen Wan, Liu Bingyan, Bu Kejun, Huang Tianheng, Dai Dongzhe, Jin Xiaobo, Yang Xiaofan, Cheng Erjian, Li Nana, Zhang Qian, Liu Fengliang, Liu Xuqiang, Zhang Dongzhou, Ma Shuailing, Tao Qiang, Zhu Pinwen, Li Shiyan, Lü Xujie, Sun Jian, Wang Xin, Yang Wenge
State Key Laboratory of Superhard Materials, Department of Physics, Jilin University, Changchun 130012, People's Republic of China.
Center for High Pressure Science and Technology Advanced Research, Shanghai 201203, People's Republic of China.
Nano Lett. 2023 Mar 22;23(6):2121-2128. doi: 10.1021/acs.nanolett.2c04385. Epub 2023 Mar 6.
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-TaSe VDWHs consisting of alternately stacking 1-TaSe and 1-TaSe monolayers are investigated under high pressure. Surprisingly, the superconductivity competes with the intralayer and adjacent-layer CDW order in 4-TaSe, 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.
包含电荷密度波（CDW）和超导性（SC）的二维（2D）范德华异质结构（VDWHs）在其性质上展现出丰富的可调性，这为优化其新奇的奇异态提供了一条新途径。超导性与电荷密度波之间的相互作用对其性质至关重要；然而，对范德华异质结构中这种相互作用的理解非常有限。在高压下对由交替堆叠的1-TaSe单层和1-TaSe单层组成的块状4-TaSe范德华异质结构进行了全面的原位研究和理论计算。令人惊讶的是，超导性在4-TaSe中与层内和相邻层的电荷密度波序竞争，这导致在压缩下超导性大幅且持续增强。当电荷密度波被完全抑制时，各层中的超导性对电荷转移的响应不同。我们的结果提供了一种有效调节范德华异质结构中超导性与电荷密度波之间相互作用的出色方法，并为设计具有定制性质的材料开辟了一条新途径。
