Time-of-flight momentum microscopy is developed. It enables direct three-dimensional mapping of the topology of the Fermi surface, identification of electron and hole pockets, and quantification of Fermi velocity as a function of wavevector.

中文翻译：

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费米表面和费米速度的直接3D映射

飞行时间动量显微镜得以发展。它可以对费米表面的拓扑结构进行直接的三维映射，可以识别电子和空穴，并可以将费米速度作为波矢的函数进行量化。