三维手征Veselago透镜
Three-dimensional chiral Veselago lensing
摘要：
光在进入具有负折射率的介质时聚焦的效应，称为Veselago透镜，可以使光学成像低于衍射极限。类似地，通过$pn$结聚焦电子可以实现技术上有前途的电子Veselago透镜。然而，它的范围仍然受到缺乏三维平台以及对计算自由度（如自旋或手性）不敏感的限制。在这里，我们提出了一个单一的材料三维电子Veselago透镜，选择性地聚焦电子给定的手征。利用拓扑半金属的手性异常，可以为单个手性创建尖锐的$pn$结，手性Veselago透镜，并利用磁场将其调谐到理想的透镜条件。我们估计，手性Veselago透镜是可观察到的非本地传输和光谱实验。特别是，我们表明，手性Veselago透镜导致巨大的非本地磁电阻。
英文摘要：
The effect by which light focuses upon entering a medium with a negative refractive index, known as Veselago lensing, may enable optical imaging below the diffraction limit. Similarly, focusing electrons across a $pn$-junction could realize a technologically promising electronic Veselago lens. However, its scope remains limited by the lack of three-dimensional platforms and its insensitivity to computational degrees of freedom, like spin or chirality. Here we propose a single-material three-dimensional electronic Veselago lens that selectively focuses electrons of a given chirality. Using the chiral anomaly of topological semimetals it is possible to create a sharp $pn$-junction for a single chirality, a chiral Veselago lens, and tune it with a magnetic field to an ideal lensing condition. We estimate that chiral Veselago lensing is observable in non-local transport and spectroscopy experiments. In particular we show that the chiral Veselago lens leads to giant non-local magnetoresistance.
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