A new beamline for acquiring spatially-resolved electronic structures at the ASTRID2 synchrotron

What is it about?

Angle resolved photoemission spectroscopy (ARPES) is a key tool for understanding the electronic band structure of materials, which provides insight into the electrical and physical properties of the material. However, the typical spot size used in ARPES can be too large to resolve small or spatially varying samples which are at the cutting edge of material growth and construction. Our paper demonstrates a new beamline which creates a beam spot of less than 4 um, allowing us to perform spatially-resolved ARPES on many more different systems, including complex crystals with many surface terminations, and two-dimensional field-effect devices.

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Photo by K8 on Unsplash

Photo by K8 on Unsplash

Why is it important?

We demonstrate a capillary optic which provides both a small spot size, and high beam intensity, which allows for many more parameters of a sample to be measured in the same experimental time. We also show how the end station is able to vary parameters like the photon energy without moving the position of the beam, which is necessary for acquiring the full band structure.