论文标题
在平滑的拓扑Volkov-pankratov异质上观察Weyl和Dirac Fermions
Observation of Weyl and Dirac fermions at smooth topological Volkov-Pankratov heterojunctions
论文作者
论文摘要
Weyl和Dirac相对论费米子在拓扑问题上无处不在。它们的相对论特征使高能量物理现象（如手性异常）以固态发生，这可以在实验中探测和探索基本的相对论理论。在这里，我们表明，在微不足道和拓扑材料之间的平滑界面上，无质量的Weyl和巨大的Dirac Fermions本质上并存。后者的出现，称为沃尔科夫 - 帕克拉托夫州，直接通过磁光谱传播，表明它们的能量光谱是由拓扑界面的平滑度完全控制的。同时，我们揭示了零能手性韦尔态的光吸收，当拓扑界面平滑时，其波函数会大大变化。因此，拓扑概况的人工工程提供了一个新颖的教科书系统，以探索凝结物质异质结构中丰富的相对论能量光谱。
Weyl and Dirac relativistic fermions are ubiquitous in topological matter. Their relativistic character enables high energy physics phenomena like the chiral anomaly to occur in solid state, which allows to experimentally probe and explore fundamental relativistic theories. Here we show that on smooth interfaces between a trivial and a topological material, massless Weyl and massive Dirac fermions intrinsically coexist. The emergence of the latter, known as Volkov-Pankratov states, is directly revealed by magneto-optical spectroscopy, evidencing that their energy spectrum is perfectly controlled by the smoothness of topological interface. Simultaneously, we reveal the optical absorption of the zero-energy chiral Weyl state, whose wavefunction is drastically transformed when the topological interface is smooth. Artificial engineering of the topology profile thus provides a novel textbook system to explore the rich relativistic energy spectra in condensed matter heterostructures.
