TPS 39A nanoARPES: High resolution Photoemission from Micro to Nanoscale

Pei-Yu Chuang^1*

¹Condensed Matter Physics Group, National Synchrotron Radiation Research Center, Hsinchu, Taiwan

* Presenter:Pei-Yu Chuang, email:chuang.py@nsrrc.org.tw

The TPS 39A nanoARPES beamline at the Taiwan Photon Source is designed to explore the electronic structures of emergent quantum and correlated materials from the micrometer to nanometer scale. It consists of two independent branches, each employing distinct focusing optics Kirkpatrick-Baez (K-B) mirrors for the μARPES branch (TPS 39A1) and zone plate optics for the nanoARPES branch (TPS 39A2). The beamline is equipped with an in house developed active mirror plane grating monochromator (AM-PGM), providing high photon flux, superior energy resolution, and a broad photon energy range from 25 to 600 eV with circular polarization. The achieved focused spot sizes are approximately 10 μm for TPS 39A1 and down to 100 nm for TPS 39A2. A newly developed endstation with a precision scanning stage enables spatially resolved ARPES, including VLEED-based spin-resolved measurements. This setup allows investigation of samples that are structurally inhomogeneous, polycrystalline with micron sized domains, or too small for conventional ARPES. TPS 39A thus opens a new window for mapping momentum- and energy-resolved phenomena in strongly correlated, magnetic, low-dimensional, and energy-related functional materials.

Keywords: microARPES, nanoARPES, spinARPES, spatial mapping