Akira Usui

7.4k total citations · 2 hit papers
163 papers, 6.1k citations indexed

About

Akira Usui is a scholar working on Geochemistry and Petrology, Condensed Matter Physics and Atomic and Molecular Physics, and Optics. According to data from OpenAlex, Akira Usui has authored 163 papers receiving a total of 6.1k indexed citations (citations by other indexed papers that have themselves been cited), including 66 papers in Geochemistry and Petrology, 51 papers in Condensed Matter Physics and 47 papers in Atomic and Molecular Physics, and Optics. Recurrent topics in Akira Usui's work include Geochemistry and Elemental Analysis (66 papers), GaN-based semiconductor devices and materials (51 papers) and Semiconductor Quantum Structures and Devices (36 papers). Akira Usui is often cited by papers focused on Geochemistry and Elemental Analysis (66 papers), GaN-based semiconductor devices and materials (51 papers) and Semiconductor Quantum Structures and Devices (36 papers). Akira Usui collaborates with scholars based in Japan, United States and Sweden. Akira Usui's co-authors include Haruo Sunakawa, Akira Sakai, Atsushi Yamaguchi, Yoshio Takahashi, Michael Bau, Chiaki Sasaoka, James R. Hein, Thomas Kuhn, Katja Schmidt and Andrea Koschinsky and has published in prestigious journals such as Nature, Physical Review Letters and Physical review. B, Condensed matter.

In The Last Decade

Akira Usui

163 papers receiving 5.8k citations

Hit Papers

Thick GaN Epitaxial Growth with Low Dislocation Density b... 1997 2026 2006 2016 1997 2014 250 500 750
What are hit papers?

Hit papers significantly outperform the citation benchmark for their cohort. A paper qualifies if it has ≥500 total citations, achieves ≥1.5× the top-1% citation threshold for papers in the same subfield and year (this is the minimum needed to enter the top 1%, not the average within it), or reaches the top citation threshold in at least one of its specific research topics.

  1. Thick GaN Epitaxial Growth with Low Dislocation Density by Hydride Vapor Phase Epitaxy
    1997 773 citations Akira Usui, Haruo Sunakawa et al. Japanese Journal of Applied Physics profile →
  2. Discriminating between different genetic types of marine ferro-manganese crusts and nodules based on rare earth elements and yttrium
    2014 424 citations Akira Usui et al. profile →

Peers

Akira Usui
Da Li China
David R. Veblen United States
Peter Herzig Austria
Catherine McCammon Germany
Tolek Tyliszczak United States
Georges Calas France
A. P. Jephcoat United Kingdom
T. Tyliszczak Canada
Emil Makovicky Denmark
Daniel R. Neuville France
Da Li China
Akira Usui
Citations per year, relative to Akira Usui Akira Usui (= 1×) peers Da Li

Countries citing papers authored by Akira Usui

Since Specialization
Citations

This map shows the geographic impact of Akira Usui's research. It shows the number of citations coming from papers published by authors working in each country. You can also color the map by specialization and compare the number of citations received by Akira Usui with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites Akira Usui more than expected).

Fields of papers citing papers by Akira Usui

Since Specialization
Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Akira Usui. Nodes represent research fields, and links connect fields that are likely to share authors. Colored nodes show fields that tend to cite the papers produced by Akira Usui. The network helps show where Akira Usui may publish in the future.

Co-authorship network of co-authors of Akira Usui

This figure shows the co-authorship network connecting the top 25 collaborators of Akira Usui. A scholar is included among the top collaborators of Akira Usui based on the total number of citations received by their joint publications. Widths of edges represent the number of papers authors have co-authored together. Node borders signify the number of papers an author published with Akira Usui. Akira Usui is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

20 of 20 papers shown
1.
Usui, Akira, Naotaka Tomioka, Yohey Suzuki, et al.. (2020). Modern precipitation of hydrogenetic ferromanganese minerals during on-site 15-year exposure tests. Scientific Reports. 10(1). 3558–3558. 18 indexed citations
2.
Usui, Akira & Katsuhiko Suzuki. (2018). Ferromanganese Crusts in the Northwestern Pacific Seamounts - A Review: Variations in Grade and Abundance on the Regional to Microscopic Scales. 1 indexed citations
3.
Kato, Shingo, et al.. (2017). Archaeal and bacterial communities in deep-sea hydrogenetic ferromanganese crusts on old seamounts of the northwestern Pacific. PLoS ONE. 12(2). e0173071–e0173071. 29 indexed citations
4.
Amakawa, Hiroshi, Akira Usui, Koichi Iijima, & Katsuhiko Suzuki. (2017). Surface layer Nd isotopic composition of ferromanganese crusts collected from the Takuyo-Daigo Seamount reflects ambient seawater. GEOCHEMICAL JOURNAL. 51(1). e1–e7. 9 indexed citations
5.
Kato, Shingo, et al.. (2011). Molecular characterization of the microbial community in hydrogenetic ferromanganese crusts of the Takuyo-Daigo Seamount, northwest Pacific. FEMS Microbiology Letters. 321(2). 121–129. 41 indexed citations
6.
Yamaguchi, Atsushi, et al.. (2011). Depth profile of residual strain in free‐standing GaN substrates measured by cross‐sectional micro‐reflectance spectroscopy. Physica status solidi. C, Conferences and critical reviews/Physica status solidi. C, Current topics in solid state physics. 8(5). 1455–1458. 2 indexed citations
7.
Shubina, T. V., M. M. Glazov, А. А. Торопов, et al.. (2008). Resonant Light Delay in GaN with Ballistic and Diffusive Propagation. Physical Review Letters. 100(8). 87402–87402. 22 indexed citations
8.
Stueben, D., et al.. (1999). Enrichments of platinum-group elements in hydrogenous, diagenetic and hydrothermal marine manganese and iron deposits. Exploration and Mining Geology. 8. 233–250. 20 indexed citations
9.
Sakai, Akira, Haruo Sunakawa, & Akira Usui. (1998). Transmission electron microscopy of defects in GaN films formed by epitaxial lateral overgrowth. Applied Physics Letters. 73(4). 481–483. 184 indexed citations
10.
Sunakawa, Haruo, Atsushi Yamaguchi, Akitaka Kimura, & Akira Usui. (1996). Growth of InN by Chloride-Transport Vapor Phase Epitaxy. Japanese Journal of Applied Physics. 35(11A). L1395–L1395. 12 indexed citations
11.
Usui, Akira. (1994). Marine geology, geophysics, and manganese nodule deposits in the Penrhyn Basin, South Pacific, August-October, 1983 (Hakurei-Maru Cruise GH83-3). 5 indexed citations
12.
Mita, Naoki, Yu Hariya, Akira Usui, et al.. (1994). A living manganese deposit, the Yuno-Taki Falls. The Journal of the Geological Society of Japan. 100(10). XXV–XXVI. 1 indexed citations
13.
Kuma, Kenshi, et al.. (1994). Crystal structures of synthetic 7 Å and 10 Å manganates substituted by mono- and divalent cations. Mineralogical Magazine. 58(392). 425–447. 65 indexed citations
14.
Ahopelto, Jouni, Henri J. Lezec, Yukinori Ochiai, Akira Usui, & H. Sakaki. (1994). Maskless InP wire formation on planar GaAs substrates. Applied Physics Letters. 64(4). 499–501. 10 indexed citations
15.
Usui, Akira. (1992). Marine geology, geophysics, and manganese nodule deposits in the southern part of the Central Pacific Basin, August-October, 1982 (Hakurei-Maru Cruise GH82-4). Medical Entomology and Zoology. 3 indexed citations
16.
Sasaoka, Chiaki, Yoshitake Kato, & Akira Usui. (1991). Temperature programmed desorption study of gallium chloride adsorbed on GaAs surfaces. Journal of Crystal Growth. 115(1-4). 94–98. 12 indexed citations
17.
Usui, Akira. (1990). Atomic Layer Epitaxy. MRS Proceedings. 198. 4 indexed citations
18.
Kato, Yoshitake, I. Mito, K. Kobayashi, et al.. (1983). VPE-Grown 1.3 µm InGaAsP/InP Double-Channel Planar Buried-Heterostructure Laser Diode with LPE-Burying Layers. Japanese Journal of Applied Physics. 22(7A). L415–L415. 2 indexed citations
19.
Mizutani, Takashi, et al.. (1980). Vapor Phase Growth of InGaAsP/InP DH Structures by the Dual-Growth-Chamber Method. Japanese Journal of Applied Physics. 19(2). L113–L116. 48 indexed citations
20.
Usui, Akira, Sukune Takenouchi, & Tetsuya Shoji. (1978). Mineralogy of deep sea manganese nodules and synthesis of manganese oxides Implications to genesis and geochemistry. Kōzan chishitsu. 28(152). 405–420. 7 indexed citations

Rankless uses publication and citation data sourced from OpenAlex, an open and comprehensive bibliographic database. While OpenAlex provides broad and valuable coverage of the global research landscape, it—like all bibliographic datasets—has inherent limitations. These include incomplete records, variations in author disambiguation, differences in journal indexing, and delays in data updates. As a result, some metrics and network relationships displayed in Rankless may not fully capture the entirety of a scholar's output or impact.

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