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Instruments / Technical Area	Publication Details	Published	Actions
	Accurate and efficient data acquisition methods for high-resolution angle-resolved photoemission microscopy Hideaki Iwasawa , Hitoshi Takita , Kazuki Goto , Wumiti Mansuer , Takeo Miyashita , Eike F. Schwier , Akihiro Ino , Kenya Shimada , Yoshihiro Aiura Scientific Reports 8 DOI: 10.1038/s41598-018-34894-7 Open Access Show Abstract ▼ Abstract: Angle-resolved photoemission spectroscopy (ARPES) is a powerful experimental technique in materials science, as it can directly probe electronic states inside solids in energy (E) and momentum (k) space. As an advanced technique, spatially-resolved ARPES using a well-focused light source (high-resolution ARPES microscopy) has recently attracted growing interests because of its capability to obtain local electronic information at micro- or nano-metric length scales. However, there exist several technical challenges to guarantee high precision in determining translational and rotational positions in reasonable measurement time. Here we present two methods of obtaining k-space mapping and real-space imaging in high-resolution ARPES microscopy. One method is for k-space mapping measurements that enables us to keep a target position on a sample surface during sample rotation by compensating rotation-induced displacements (tracing acquisition method). Another method is for real-space imaging measurements that significantly reduces total acquisition time (scanning acquisition method). We provide several examples of these methods that clearly indicate higher accuracy in k-space mapping as well as higher efficiency in real-space imaging, and thus improved throughput of high-resolution APRES microscopy.	Nov 2018
	Development of laser-based scanning µ-ARPES system with ultimate energy and momentum resolutions Hideaki Iwasawa , Eike F. Schwier , Masashi Arita , Akihiro Ino , Hirofumi Namatame , Masaki Taniguchi , Yoshihiro Aiura , Kenya Shimada Ultramicroscopy 182, 85 - 91 DOI: 10.1016/j.ultramic.2017.06.016 Open Access Show Abstract ▼ Abstract: We have developed a laser-based scanning angle-resolved photoemission spectroscopy system (µ-ARPES) equipped with a high precision 6-axis control system, realizing not only high-resolution photoemission spectroscopy in energy and momentum, but also spatial resolution of a µm scale. This enables our µ-ARPES system to probe fine details of intrinsic electronic states near the Fermi level such as the superconducting gaps and lifetime broadening.	Nov 2017
	Evaluation of the coupling parameters of many-body interactions in Fe(110) X. Y. Cui , K. Shimada , Y. Sasisaka , H. Kato , M. Hoesch , T. Oguchi , Y. Aiura , H. Namatame , M. Taniguchi Physical Review B 82 (19), 195132 DOI: 10.1103/PhysRevB.82.195132 Show Abstract ▼ Abstract: In order to clarify many-body interactions in ferromagnetic iron, we performed high-resolution angle-resolved photoemission spectroscopy (ARPES) on a Fe(110) single crystal. We quantitatively analyzed the ARPES line shapes for a majority-spin band crossing the Fermi level (EF). The observed group velocity was reduced with respect to the band-structure calculation by a factor of 1/2.7, giving a coupling parameter due to the electron-electron interaction of λee=1.7±0.1. This suggests a strong electron correlation in Fe 3d, which is consistent with recent high-resolution ARPES results. The real and imaginary parts of the self-energy have been experimentally evaluated near EF. The coupling parameter of the electron-phonon interaction was estimated to be λep=0.16±0.02, which is 1/10 of λee. The effective-mass enhancement with respect to the band mass m∗/mb∼1+λee+λep∼3 was, therefore, mainly caused by electron correlation.	Nov 2010

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