Soft X-ray ARPES for three-dimensional crystals in the micrometre region

Matsuki, Takayuki; Senba, Yasunori; Ohashi, Haruhiko; Ohkochi, Takuo; Matsushita, Tomohiro; Kinoshita, Toyohiko; Shin, Shik

doi:10.1107/s1600577521007487

Cited by 16 publications

(11 citation statements)

References 20 publications

(25 reference statements)

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“…Monochromatic Al Kα (1486.7 eV) was used as the incident X-ray. The PEH measurements were performed at the BL25SU in SPring-8. , The base pressure of the measurement chamber was 2.8 × 10 –8 Pa. We used Scienta-Omicron DA30 as an electron analyzer . The electron analyzer had a 2D detector which covered an azimuthal angle of ±15° and a polar angle of ±10°.…”

Section: Methodsmentioning

confidence: 99%

“…31,37 The base pressure of the measurement chamber was 2.8 × 10 −8 Pa. We used Scienta-Omicron DA30 as an electron analyzer. 40 The electron analyzer had a 2D detector which covered an azimuthal angle of ±15°and a polar angle of ±10°. The angle between the direction of the electron analyzer and the incident soft X-ray beam was 90°.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

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Direct Observation of Atomic Structures and Chemical States of Active and Inactive Dopant Sites in Mg-Doped GaN

Tang

Takeuchi

Tanaka

et al. 2022

ACS Appl. Electron. Mater.

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We employed photoelectron spectroscopy (PES) and photoelectron holography (PEH) to clarify the atomic structures and chemical states in the active and inactive dopant states of Mg-doped GaN. Due to the lack of available direct evidence, this has been a controversial issue. From PES, we found that two chemical states existed in the Mg-doped GaN: One is an active dopant state, and the other is an inactive state. We employed PEH to investigate the two observed chemical states, indicating that the active state could be attributed to a Mg atom substituting a Ga atom in the Mg-doped GaN structure (MgGa). The inactive state, on the other hand, was considered to be a disordered structure, an amorphous structure, defects, and/or MgGa bonding with a H atom in that structure.

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Section: Methodsmentioning

confidence: 99%

Section: ■ Experimental Sectionmentioning

confidence: 99%

Direct Observation of Atomic Structures and Chemical States of Active and Inactive Dopant Sites in Mg-Doped GaN

Tang

Takeuchi

Tanaka

et al. 2022

ACS Appl. Electron. Mater.

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“…At the downstream end of branch A, angle-resolved photoemission (ARPES) studies with a micron-sized beam in the soft-X-ray region are performed. 19,20) A detection area of diameter around 5-10 μm has been achieved using Walter mirror optics. 19) A potential difficulty when micron-beam ARPES is performed is that the exact position of the observed area may be lost during sample rotation.…”

Section: Upgrade Arrangement and Setup Of The Experimental Apparatusesmentioning

confidence: 99%

Progress in photoelectron holography at SPring-8

Kinoshita

Matsuki

Matsushita

et al. 2019

Jpn. J. Appl. Phys.

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The angular distributions of photoelectrons and Auger electrons from single crystal surfaces show characteristic diffraction patterns, which contain information on the local atomic structures surrounding the emitter atoms. Using computational reconstruction processes on the diffraction patterns enables us to determine the local atomic structures of, for example, dopants, catalytic active sites, and surface/interface structures. This method has become known as “photoelectron holography (PEH)”. Several advanced photoelectron analyzers for PEH are now available at beamlines at SPring-8, the world’s largest synchrotron radiation facility. Recently, the use of micron-sized photon beams, as well as pump-and-probe time-resolved techniques has become possible with relatively high energy resolution. Here, the experimental apparatus and some representative applications are introduced.

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“…B. of the Supplemental Material [40] and Refs. [44][45][46]57]). We find that for the M-Γ-M binding energy vs crystal momentum (E B vs k) dispersion, three bands become degenerate 240 meV below the Fermi level at the Γ point, which is also reflected in the ab initio calculation [Fig.…”

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confidence: 99%