Reduced dimensionality leads to emergent phenomena in quantum materials, and there is a need for accelerated materials discovery of nanoscale quantum materials in reduced dimensions. Thermomechanical nanomolding is a rapid synthesis method that produces high-quality single-crystalline nanowires with controlled dimensions over wafer-scale sizes. Herein, we apply nanomolding to fabricate nanowires from bulk feedstock of MoP, a triple-point topological metal with extremely high conductivity that is promising for low-resistance interconnects. Surprisingly, we obtained single-crystalline Mo₄P₃ nanowires, which is a metastable phase at room temperature and atmospheric pressure. We thus demonstrate that nanomolding can create metastable phases inaccessible by other nanomaterial syntheses and can explore a previously inaccessible synthesis space at high temperatures and pressures. Furthermore, our results suggest that the current understanding of interfacial solid diffusion for nanomolding is incomplete, providing opportunities to explore solid-state diffusion at high-pressure and high-temperature regimes in confined dimensions.

降维导致量子材料出现涌现现象，需要加速发现降维纳米级量子材料。热机械纳米成型是一种快速合成方法，可生产高质量的单晶纳米线，其尺寸可控超过晶圆级尺寸。在这里，我们应用纳米成型从 MoP 的大块原料制造纳米线，MoP 是一种具有极高导电性的三点拓扑金属，有望用于低电阻互连。令人惊讶的是，我们获得了单晶 Mo ₄ P ₃纳米线，它在室温和大气压力下是亚稳相。因此，我们证明纳米成型可以产生其他纳米材料合成无法达到的亚稳相，并且可以在高温高压下探索以前无法达到的合成空间。此外，我们的结果表明，目前对纳米成型的界面固体扩散的理解是不完整的，这为在受限尺寸的高压和高温状态下探索固态扩散提供了机会。