World's Best Scientists 2026 revealed!
Hiroshi Okamoto

Hiroshi Okamoto

D-Index & Metrics

Discipline name D-Index World Ranking Current World Ranking National Ranking Current National Ranking Publications Citations
Materials Science 78 2976 2873 124 121 837 21670
Chemistry 78 3843 3484 217 203 693 20218

Hiroshi Okamoto publications per year

The chart shows the history of publications by Hiroshi Okamoto between 1953 and 2025, highlighting the no. of papers published in each year and offering an overview of the publication velocity of this scholar. Hiroshi Okamoto published across 73 years, from 1953 to 2025, averaging 16.1 papers a year. Output peaked at 44 publications in 2009. 14 of the 1,172 publications appeared in the last two years.

No. of publications
10 20 30 40
Bar chart. Horizontal axis: year, 1953 to 2025. Vertical axis: number of publications, 0 to 44. Peak 44 publications in 2009. 1953: 1 publication 1954: 0 publications 1955: 1 publication 1956: 1 publication 1957: 1 publication 1958: 2 publications 1959: 5 publications 1960: 1 publication 1961: 1 publication 1962: 0 publications 1963: 0 publications 1964: 2 publications 1965: 0 publications 1966: 0 publications 1967: 0 publications 1968: 1 publication 1969: 3 publications 1970: 3 publications 1971: 3 publications 1972: 3 publications 1973: 6 publications 1974: 2 publications 1975: 3 publications 1976: 6 publications 1977: 6 publications 1978: 16 publications 1979: 11 publications 1980: 9 publications 1981: 14 publications 1982: 5 publications 1983: 23 publications 1984: 21 publications 1985: 29 publications 1986: 24 publications 1987: 21 publications 1988: 16 publications 1989: 29 publications 1990: 17 publications 1991: 16 publications 1992: 29 publications 1993: 16 publications 1994: 16 publications 1995: 18 publications 1996: 14 publications 1997: 28 publications 1998: 26 publications 1999: 35 publications 2000: 20 publications 2001: 36 publications 2002: 41 publications 2003: 38 publications 2004: 27 publications 2005: 33 publications 2006: 29 publications 2007: 29 publications 2008: 35 publications 2009: 44 publications 2010: 31 publications 2011: 30 publications 2012: 30 publications 2013: 31 publications 2014: 36 publications 2015: 22 publications 2016: 13 publications 2017: 20 publications 2018: 28 publications 2019: 28 publications 2020: 24 publications 2021: 25 publications 2022: 12 publications 2023: 12 publications 2024: 9 publications 2025: 5 publications
1953 2025

1,172 publications in total across all disciplines

View publications per year as a table
Hiroshi Okamoto: publications per year, 1953 to 2025
Year Publications
1953 1
1954 0
1955 1
1956 1
1957 1
1958 2
1959 5
1960 1
1961 1
1962 0
1963 0
1964 2
1965 0
1966 0
1967 0
1968 1
1969 3
1970 3
1971 3
1972 3
1973 6
1974 2
1975 3
1976 6
1977 6
1978 16
1979 11
1980 9
1981 14
1982 5
1983 23
1984 21
1985 29
1986 24
1987 21
1988 16
1989 29
1990 17
1991 16
1992 29
1993 16
1994 16
1995 18
1996 14
1997 28
1998 26
1999 35
2000 20
2001 36
2002 41
2003 38
2004 27
2005 33
2006 29
2007 29
2008 35
2009 44
2010 31
2011 30
2012 30
2013 31
2014 36
2015 22
2016 13
2017 20
2018 28
2019 28
2020 24
2021 25
2022 12
2023 12
2024 9
2025 5
Total 1,172
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Hiroshi Okamoto publication distribution in Materials Science in 2026

The chart shows the distribution of publications by all Research.com ranked scientists in the field of Materials Science in 2026. The highlighted bar marks where Hiroshi Okamoto sits on this spectrum.

No. of scientists
200 400 600 800
Bar chart with 57 bars. Horizontal axis: publications, 50–69 to 1,163+. Vertical axis: number of scientists, 0 to 891. Most scientists, 891, have 190–209 publications. The last bar groups every scientist with 1,163 publications or more. The highlighted bar, 830–849 publications, is where this scientist sits. 50–69 publications: 28 scientists 70–89 publications: 152 scientists 90–109 publications: 356 scientists 110–129 publications: 487 scientists 130–149 publications: 723 scientists 150–169 publications: 835 scientists 170–189 publications: 850 scientists 190–209 publications: 891 scientists 210–229 publications: 862 scientists 230–249 publications: 766 scientists 250–269 publications: 726 scientists 270–289 publications: 665 scientists 290–309 publications: 593 scientists 310–329 publications: 537 scientists 330–349 publications: 477 scientists 350–369 publications: 440 scientists 370–389 publications: 356 scientists 390–409 publications: 321 scientists 410–429 publications: 256 scientists 430–449 publications: 246 scientists 450–469 publications: 216 scientists 470–489 publications: 212 scientists 490–509 publications: 174 scientists 510–529 publications: 194 scientists 530–549 publications: 162 scientists 550–569 publications: 131 scientists 570–589 publications: 111 scientists 590–609 publications: 103 scientists 610–629 publications: 99 scientists 630–649 publications: 77 scientists 650–669 publications: 92 scientists 670–689 publications: 56 scientists 690–709 publications: 53 scientists 710–729 publications: 53 scientists 730–749 publications: 38 scientists 750–769 publications: 52 scientists 770–789 publications: 43 scientists 790–809 publications: 38 scientists 810–829 publications: 34 scientists 830–849 publications: 25 scientists 850–869 publications: 18 scientists 870–889 publications: 20 scientists 890–909 publications: 24 scientists 910–929 publications: 27 scientists 930–949 publications: 20 scientists 950–969 publications: 17 scientists 970–989 publications: 10 scientists 990–1,009 publications: 16 scientists 1,010–1,029 publications: 13 scientists 1,030–1,049 publications: 12 scientists 1,050–1,069 publications: 9 scientists 1,070–1,089 publications: 8 scientists 1,090–1,109 publications: 7 scientists 1,110–1,129 publications: 9 scientists 1,130–1,149 publications: 2 scientists 1,150–1,162 publications: 5 scientists 1,163+ publications: 100 scientists
50–69 publications 1,163+

This scientist: 837 publications — 97th percentile

97% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 1,163 publications or more.

View publications distribution as a table
Number of Materials Science scientists by publication count, Research.com 2026 ranking edition. Based on 12,847 ranked scientists.
Publications Scientists This scientist
50–69 28
70–89 152
90–109 356
110–129 487
130–149 723
150–169 835
170–189 850
190–209 891
210–229 862
230–249 766
250–269 726
270–289 665
290–309 593
310–329 537
330–349 477
350–369 440
370–389 356
390–409 321
410–429 256
430–449 246
450–469 216
470–489 212
490–509 174
510–529 194
530–549 162
550–569 131
570–589 111
590–609 103
610–629 99
630–649 77
650–669 92
670–689 56
690–709 53
710–729 53
730–749 38
750–769 52
770–789 43
790–809 38
810–829 34
830–849 25 837
850–869 18
870–889 20
890–909 24
910–929 27
930–949 20
950–969 17
970–989 10
990–1,009 16
1,010–1,029 13
1,030–1,049 12
1,050–1,069 9
1,070–1,089 8
1,090–1,109 7
1,110–1,129 9
1,130–1,149 2
1,150–1,162 5
1,163+ 100
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Hiroshi Okamoto D-index placement in Materials Science in 2026

The chart shows the D-index (discipline H-index) distribution of Materials Science scientists ranked by Research.com in 2026. The highlighted bar marks where Hiroshi Okamoto sits on this spectrum.

No. of scientists
200 400 600
Bar chart with 64 bars. Horizontal axis: D-Index, 40–41 to 165+. Vertical axis: number of scientists, 0 to 667. Most scientists, 667, have 52–53 D-Index. The last bar groups every scientist with 165 D-Index or more. The highlighted bar, 78–79 D-Index, is where this scientist sits. 40–41 D-Index: 211 scientists 42–43 D-Index: 450 scientists 44–45 D-Index: 612 scientists 46–47 D-Index: 612 scientists 48–49 D-Index: 598 scientists 50–51 D-Index: 657 scientists 52–53 D-Index: 667 scientists 54–55 D-Index: 621 scientists 56–57 D-Index: 597 scientists 58–59 D-Index: 610 scientists 60–61 D-Index: 587 scientists 62–63 D-Index: 606 scientists 64–65 D-Index: 533 scientists 66–67 D-Index: 490 scientists 68–69 D-Index: 469 scientists 70–71 D-Index: 378 scientists 72–73 D-Index: 421 scientists 74–75 D-Index: 359 scientists 76–77 D-Index: 323 scientists 78–79 D-Index: 299 scientists 80–81 D-Index: 230 scientists 82–83 D-Index: 210 scientists 84–85 D-Index: 195 scientists 86–87 D-Index: 203 scientists 88–89 D-Index: 175 scientists 90–91 D-Index: 175 scientists 92–93 D-Index: 142 scientists 94–95 D-Index: 121 scientists 96–97 D-Index: 117 scientists 98–99 D-Index: 107 scientists 100–101 D-Index: 88 scientists 102–103 D-Index: 85 scientists 104–105 D-Index: 68 scientists 106–107 D-Index: 62 scientists 108–109 D-Index: 57 scientists 110–111 D-Index: 45 scientists 112–113 D-Index: 49 scientists 114–115 D-Index: 50 scientists 116–117 D-Index: 34 scientists 118–119 D-Index: 38 scientists 120–121 D-Index: 37 scientists 122–123 D-Index: 29 scientists 124–125 D-Index: 28 scientists 126–127 D-Index: 24 scientists 128–129 D-Index: 33 scientists 130–131 D-Index: 28 scientists 132–133 D-Index: 21 scientists 134–135 D-Index: 20 scientists 136–137 D-Index: 23 scientists 138–139 D-Index: 17 scientists 140–141 D-Index: 12 scientists 142–143 D-Index: 17 scientists 144–145 D-Index: 21 scientists 146–147 D-Index: 13 scientists 148–149 D-Index: 11 scientists 150–151 D-Index: 14 scientists 152–153 D-Index: 13 scientists 154–155 D-Index: 9 scientists 156–157 D-Index: 10 scientists 158–159 D-Index: 7 scientists 160–161 D-Index: 4 scientists 162–163 D-Index: 4 scientists 164 D-Index: 3 scientists 165+ D-Index: 98 scientists
40–41 D-Index 165+

This scientist: 78 D-Index — 77th percentile

77% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 165 D-Index or more.

View D-Index distribution as a table
Number of Materials Science scientists by D-index, Research.com 2026 ranking edition. Based on 12,847 ranked scientists.
D-Index Scientists This scientist
40–41 211
42–43 450
44–45 612
46–47 612
48–49 598
50–51 657
52–53 667
54–55 621
56–57 597
58–59 610
60–61 587
62–63 606
64–65 533
66–67 490
68–69 469
70–71 378
72–73 421
74–75 359
76–77 323
78–79 299 78
80–81 230
82–83 210
84–85 195
86–87 203
88–89 175
90–91 175
92–93 142
94–95 121
96–97 117
98–99 107
100–101 88
102–103 85
104–105 68
106–107 62
108–109 57
110–111 45
112–113 49
114–115 50
116–117 34
118–119 38
120–121 37
122–123 29
124–125 28
126–127 24
128–129 33
130–131 28
132–133 21
134–135 20
136–137 23
138–139 17
140–141 12
142–143 17
144–145 21
146–147 13
148–149 11
150–151 14
152–153 13
154–155 9
156–157 10
158–159 7
160–161 4
162–163 4
164 3
165+ 98
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Overview

Hiroshi Okamoto is affiliated with the University of Tokyo in Japan and has contributed extensively to research in engineering, materials science, and physics and astronomy. Their work covers a wide range of topics with particular focus on organic and molecular conductors, perovskite materials, terahertz technology, acoustic wave resonator technologies, and solid-state spectroscopy and crystallography.

Okamoto's research spans several subfields, including electrical and electronic engineering, atomic and molecular physics and optics, electronic, optical and magnetic materials, biomedical engineering, and condensed matter physics.

The researcher has been published frequently in key venues such as Physical Review B, where they have eight publications, the Journal of the Physical Society of Japan with four publications, Nature Communications and Physical Review Research each hosting three, and the Journal of the American Chemical Society with two papers.

Notable recent papers include:

  • "A review of autonomous agricultural vehicles (The experience of Hokkaido University)" (2020), Journal of Terramechanics
  • "The Effectiveness of an Active Learning Program in Promoting a Healthy Lifestyle among Older Adults with Low Health Literacy: A Randomized Controlled Trial" (2020), Gerontology
  • "Long Carbon-Carbon Bonding beyond 2 Å in Tris(9-fluorenylidene)methane" (2021), Journal of the American Chemical Society
  • "Laser Pouch Motors: Selective and Wireless Activation of Soft Actuators by Laser-Powered Liquid-to-Gas Phase Change" (2020), IEEE Robotics and Automation Letters
  • "Ni(III) Mott-Hubbard-like State Containing High-Spin Ni(II) in a Semiconductive Bromide-Bridged Ni-Chain Compound" (2022), Inorganic Chemistry

Frequent co-authors collaborating with Okamoto include Tatsuya Miyamoto with 34 joint works, N. Kida with 15, N. TAKAMURA with 10, Takeshi Morimoto with 7, and T Yamakawa with 6 co-authored publications.

Best Publications

  • Optical bandgap energy of wurtzite InN

    Unknown

  • Ultrafast optical switching to a metallic state by photoinduced mott transition in a halogen-bridged nickel-chain compound.

    S. Iwai;S. Iwai;M. Ono;A. Maeda;H. Matsuzaki

  • Gigantic optical nonlinearity in one-dimensional Mott–Hubbard insulators

    H. Kishida;H. Matsuzaki;H. Okamoto;H. Okamoto;T. Manabe

  • New Semiconductor Alloy GaAs1-xBix Grown by Metal Organic Vapor Phase Epitaxy

    Kunishige Oe;Hiroshi Okamoto

  • Cyclic ADP-ribose Binds to FK506-binding Protein 12.6 to Release Ca2+ from Islet Microsomes

    Naoya Noguchi;Shin Takasawa;Koji Nata;Akira Tohgo

  • CD38 DISRUPTION IMPAIRS GLUCOSE-INDUCED INCREASES IN CYCLIC ADP-RIBOSE, CA2+I, AND INSULIN SECRETION

    Ichiro Kato;Yasuhiko Yamamoto;Miki Fujimura;Naoya Noguchi

  • Septic Shock Is Associated with Receptor for Advanced Glycation End Products Ligation of LPS

    Yasuhiko Yamamoto;Ai Harashima;Hidehito Saito;Koichi Tsuneyama

  • Thermochromism in an organic crystal based on the coexistence of sigma- and pi-dimers.

    Yasushi Morita;Yasushi Morita;Shuichi Suzuki;Kozo Fukui;Shigeaki Nakazawa

  • Inhibition of MCP-1/CCR2 pathway ameliorates the development of diabetic nephropathy

    Hiroshi Kanamori;Takeshi Matsubara;Akira Mima;Eriko Sumi

  • Two-step spin conversion in a cyanide-bridged ferrous square.

    Masayuki Nihei;Mayumi Ui;Mizuho Yokota;Lingqin Han

  • Recent advances in the Okamoto model: the CD38-cyclic ADP-ribose signal system and the regenerating gene protein (Reg)-Reg receptor system in beta-cells.

    Hiroshi Okamoto;Shin Takasawa

  • Potential Oscillations in Galvanostatic Electrooxidation of Formic Acid on Platinum: A Time-Resolved Surface-Enhanced Infrared Study

    Gabor Samjeské;Atsushi Miki;Shen Ye;Akira Yamakata

  • Bottom-up realization of a porous metal–organic nanotubular assembly

    Kazuya Otsubo;Kazuya Otsubo;Yusuke Wakabayashi;Jun Ohara;Jun Ohara;Shoji Yamamoto

  • Programmable spin-state switching in a mixed-valence spin-crossover iron grid

    Takuto Matsumoto;Graham N. Newton;Takuya Shiga;Shinya Hayami

  • Quantum interference between charge excitation paths in a solid-state Mott insulator

    S. Wall;D. Brida;S. R. Clark;Henri P. Ehrke

  • General features of photoinduced spin dynamics in ferromagnetic and ferrimagnetic compounds

    T. Ogasawara;K. Ohgushi;Y. Tomioka;K. S. Takahashi

  • Photoinduced metallic state mediated by spin-charge separation in a one-dimensional organic Mott insulator.

    H. Okamoto;H. Okamoto;H. Matsuzaki;T. Wakabayashi;Y. Takahashi

  • Effect of Well Size Fluctuation on Photoluminescence Spectrum of AlAs–GaAs Superlattices

    Leon Goldstein;Yoshiji Horikoshi;Seigo Tarucha;Hiroshi Okamoto

  • Cyclic ADP-ribose and Inositol 1,4,5-Trisphosphate as Alternate Second Messengers for Intracellular Ca2+ Mobilization in Normal and Diabetic β-Cells

    Shin Takasawa;Takako Akiyama;Koji Nata;Michio Kuroki

  • Anomalous dielectric response in tetrathiafulvalene-p-chloranil as observed in temperature- and pressure-induced neutral-to-ionic phase transition.

    H. Okamoto;T. Mitani;Y. Tokura;S. Koshihara

  • New Semiconductor Alloy GaAs_ Bi_x Grown by Metal Organic Vapor Phase Epitaxy

    Kunishige Oe;Hiroshi Okamoto

Frequent Co-Authors

Masahiro Yamashita
Masahiro Yamashita Tohoku University
Tadaoki Mitani
Tadaoki Mitani Japan Advanced Institute of Science and Technology
Shin Takasawa
Shin Takasawa Nara Medical University
Yoshinori Tokura
Yoshinori Tokura University of Tokyo
Hitoshi Miyasaka
Hitoshi Miyasaka Tohoku University
Yasuhiro Tokura
Yasuhiro Tokura University of Tsukuba
Sachio Horiuchi
Sachio Horiuchi National Institute of Advanced Industrial Science and Technology
Seigo Tarucha
Seigo Tarucha University of Tokyo
Naoyuki Kamatani
Naoyuki Kamatani StaGen (Japan)
Tatsuo Hasegawa
Tatsuo Hasegawa University of Tokyo

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