Development of a versatile micro-focused angle-resolved photoemission\n spectroscopy system with Kirkpatrick-Baez mirror optics

Abstract

Angle-resolved photoemission spectroscopy using a micro-focused beam spot\n(micro-ARPES) is becoming a powerful tool to elucidate key electronic states of\nexotic quantum materials. We have developed a versatile micro-ARPES system\nbased on synchrotron radiation beam focused with a Kirkpatrick-Baez mirror\noptics. The mirrors are monolithically installed on a stage, which is driven\nwith five-axes motion, and are vibrationally separated from the ARPES\nmeasurement system. Spatial mapping of the Auphotolithography pattern on Si\nsignifies the beam spot size of 10 $\\mu$m (horizontal) x 12 $\\mu$m (vertical)\nat the sample position, which is well suited to resolve the fine structure in\nlocal electronic states. Utilization of the micro beam and the high precision\nsample motion system enables the accurate spatially resolved band-structure\nmapping, as demonstrated by the observation of a small band anomaly associated\nwith tiny sample bending near the edge of a cleaved topological insulator\nsingle crystal.\n