温度促进PbO $_2$中的拓扑半金属相
Topological semimetallic phase in PbO$_2$ promoted by temperature
摘要：
表现出拓扑有序的材料具有奇异的现象，这些现象可以为从低功耗电子学到量子计算机等领域的新发展奠定基础。在过去的十年里，人们见证了拓扑材料的多个实验实现和数千个预测。然而，人们已经确定，增加温度破坏拓扑秩序，限制许多拓扑材料非常低的温度，从而阻碍实际应用。在这里，我们提出了一个物质实现的温度促进拓扑秩序。我们发现，已被广泛用于铅酸电池，$β$ -PbO $_2$，主机的拓扑半金属相驱动的热膨胀和电子-声子耦合温度升高时。我们确定之间的相互作用的准二维性质的价带的电荷分布的三维性质的导带的电荷分布的微观机制驱动这种非常规的温度依赖性。因此，我们提出了一个一般原则，寻找和设计新的拓扑材料，其拓扑秩序是通过增加温度稳定。这为拓扑材料从实验室到技术设备提供了清晰的路线图。
英文摘要：
Materials exhibiting topological order host exotic phenomena that could form the basis for novel developments in areas ranging from low-power electronics to quantum computers. The past decade has witnessed multiple experimental realizations and thousands of predictions of topological materials. However, it has been determined that increasing temperature destroys topological order, restricting many topological materials to very low temperatures and thus hampering practical applications. Here, we propose a material realization of temperature promoted topological order. We show that a semiconducting oxide that has been widely used in lead-acid batteries, $β$-PbO$_2$, hosts a topological semimetallic phase driven by both thermal expansion and electron-phonon coupling upon increasing temperature. We identify the interplay between the quasi-two-dimensional nature of the charge distribution of the valence band with the three-dimensional nature of the charge distribution of the conduction band as the microscopic mechanism driving this unconventional temperature dependence. Thus, we propose a general principle to search for and design novel topological materials whose topological order is stabilized by increasing temperature. This provides a clear roadmap for taking topological materials from the laboratory to technological devices.
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