Reiji Kumai

13.9k total citations · 2 hit papers
235 papers, 11.0k citations indexed

About

Reiji Kumai is a scholar working on Electronic, Optical and Magnetic Materials, Materials Chemistry and Condensed Matter Physics. According to data from OpenAlex, Reiji Kumai has authored 235 papers receiving a total of 11.0k indexed citations (citations by other indexed papers that have themselves been cited), including 170 papers in Electronic, Optical and Magnetic Materials, 106 papers in Materials Chemistry and 65 papers in Condensed Matter Physics. Recurrent topics in Reiji Kumai's work include Organic and Molecular Conductors Research (55 papers), Magnetic and transport properties of perovskites and related materials (50 papers) and Advanced Condensed Matter Physics (50 papers). Reiji Kumai is often cited by papers focused on Organic and Molecular Conductors Research (55 papers), Magnetic and transport properties of perovskites and related materials (50 papers) and Advanced Condensed Matter Physics (50 papers). Reiji Kumai collaborates with scholars based in Japan, Ukraine and United Kingdom. Reiji Kumai's co-authors include Sachio Horiuchi, Yoshinori Tokura, Y. Okimoto, Y. Tokura, Tatsuo Hasegawa, Toshikazu Yamada, Hiromi Minemawari, Y. Tomioka, Jun’ya Tsutsumi and Youichi Murakami and has published in prestigious journals such as Nature, Science and Journal of the American Chemical Society.

In The Last Decade

Reiji Kumai

229 papers receiving 10.8k citations

Hit Papers

align trajectories

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.

Inkjet printing of single-crystal films

2011 1.5k citations Reiji Kumai, Tatsuo Hasegawa et al. Nature profile →
Above-room-temperature ferroelectricity in a single-component molecular crystal

2010 675 citations Sachio Horiuchi, Y. Tokunaga et al. Nature profile →

Peers — A (Enhanced Table)

Peers by citation overlap · career bar shows stage (early→late) cites · hero ref

Name	h						Papers	Cites
Reiji Kumai Japan	49	6.2k	5.3k	4.1k	2.4k	1.4k	235	11.0k
Shin‐ya Koshihara Japan	49	7.9k 1.3×	9.6k 1.8×	2.9k 0.7×	1.3k 0.5×	729 0.5×	234	13.2k
M. Knupfer Germany	65	3.4k 0.6×	7.2k 1.3×	5.1k 1.3×	3.3k 1.4×	1.4k 1.0×	452	13.5k
Kunio Awaga Japan	51	5.5k 0.9×	5.6k 1.1×	3.1k 0.7×	621 0.3×	565 0.4×	330	10.2k
Swapan K. Pati India	57	2.2k 0.4×	8.1k 1.5×	4.7k 1.1×	870 0.4×	1.1k 0.8×	371	12.9k
Xutang Tao China	64	5.4k 0.9×	11.7k 2.2×	9.6k 2.3×	561 0.2×	1.7k 1.2×	656	17.7k
Tatsuo Hasegawa Japan	48	2.7k 0.4×	2.5k 0.5×	5.3k 1.3×	474 0.2×	1.2k 0.8×	217	8.1k
Enric Cañadell Spain	51	6.3k 1.0×	4.5k 0.8×	2.9k 0.7×	1.3k 0.5×	250 0.2×	449	10.1k
Akiko Kobayashi Japan	60	12.4k 2.0×	3.8k 0.7×	5.4k 1.3×	1.7k 0.7×	536 0.4×	507	15.7k
Masahiro Yamashita Japan	50	7.6k 1.2×	5.5k 1.0×	2.3k 0.6×	660 0.3×	521 0.4×	449	11.3k
Sachio Horiuchi Japan	38	3.1k 0.5×	3.9k 0.7×	2.7k 0.7×	289 0.1×	1.2k 0.9×	148	6.4k

Countries citing papers authored by Reiji Kumai

Since Specialization

Citations

This map shows the geographic impact of Reiji Kumai'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 Reiji Kumai with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites Reiji Kumai more than expected).

Fields of papers citing papers by Reiji Kumai

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Reiji Kumai. 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 Reiji Kumai. The network helps show where Reiji Kumai may publish in the future.

Co-authorship network of co-authors of Reiji Kumai

This figure shows the co-authorship network connecting the top 25 collaborators of Reiji Kumai. A scholar is included among the top collaborators of Reiji Kumai 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 Reiji Kumai. Reiji Kumai is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

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20 of 20 papers shown

Uchida, Emi, Hiroyuki Minamikawa, Rie Haruki, et al.. (2025). Abrupt and Reversible Stretching in an Azobenzene Single Crystal via Thermal Phase Transition. Advanced Science. 12(48). e12603–e12603.

Kumai, Reiji, et al.. (2025). Helical diamagnetism of a polyaniline-based polynitroxyl radical/hydroxypropyl cellulose blend. European Polymer Journal. 228. 113790–113790. 1 indexed citations

Inoue, Satoru, Toshiki Higashino, Satoshi Matsuoka, et al.. (2024). Stability of ternary interfaces and its effects on ideal switching characteristics in inverted coplanar organic transistors. Physical Review Applied. 21(2). 5 indexed citations

Kumai, Reiji, et al.. (2023). Liquid crystal photo-cross-linking phenomenon: synthesis of disubstituted polyacetylenes and emission from liquid crystal. Journal of Materials Science. 58(8). 3837–3850. 1 indexed citations

Nimori, Shigeki, et al.. (2022). Hydroxypropyl cellulose/Poly(aniline-co-pyridine-oxyl) as a liquid crystal polymer/polyradical blend with helical magnetic structure. Polymer-Plastics Technology and Materials. 61(7). 751–760. 2 indexed citations

Goto, Hiromasa, et al.. (2022). Synthesis of polyaniline in organic solvents. Polymer-Plastics Technology and Materials. 61(14). 1593–1606. 5 indexed citations

Ishibashi, Shoji, Sachio Horiuchi, & Reiji Kumai. (2021). Hydrogen-bonded single-component organic ferroelectrics revisited by van der Waals density-functional theory calculations. Physical Review Materials. 5(9). 7 indexed citations

Goto, Hiromasa, et al.. (2021). Sequential micro-Maltese cross array in the ground beetle Carabus insulicola. Micron. 150. 103136–103136. 1 indexed citations

Zhang, Dongwei, Ryohei Kameyama, Changbin Zhao, et al.. (2020). Effect of Alkyl Chain Length on Charge Transport Property of Anthracene-Based Organic Semiconductors. ACS Applied Materials & Interfaces. 13(1). 989–998. 27 indexed citations

10.

OKAZAKI, R., Kensuke Kobayashi, Reiji Kumai, et al.. (2020). Current-induced Giant Lattice Deformation in the Mott Insulator Ca₂RuO₄. Journal of the Physical Society of Japan. 89(4). 44710–44710. 11 indexed citations

11.

Shiga, Takuya, Reiji Kumai, Franz Renz, et al.. (2019). A Brønsted‐Ligand‐Based Iron Complex as a Molecular Switch with Five Accessible States. Angewandte Chemie International Edition. 58(17). 5658–5662. 57 indexed citations

12.

Kumai, Reiji, et al.. (2019). Synthesis and Properties of Chiral Polyazobenzenes with Photoinduced Change in Optical Activity. Macromolecules. 52(6). 2340–2348. 13 indexed citations

13.

Kumai, Reiji, et al.. (2019). Synthesis of Polyazobenzenes Exhibiting Photoisomerization and Liquid Crystallinity. Polymers. 11(2). 348–348. 3 indexed citations

14.

Kikuchi, Ryosuke, et al.. (2019). Rod-shaped 1D polymer-assisted anisotropic self-assembly of 0D nanoparticles by a solution-drying method. Journal of Materials Chemistry C. 7(24). 7442–7453. 9 indexed citations

15.

Kumai, Reiji, et al.. (2019). Synthesis of methyl‐substituted azobenzene–carbazole conjugated copolymers with photoinduced structural changes. Journal of Polymer Science Part A Polymer Chemistry. 57(16). 1756–1764. 8 indexed citations

16.

Wei, Rong‐Jia, Jamie M. Cameron, Graham N. Newton, et al.. (2016). Solvent-induced on/off switching of intramolecular electron transfer in a cyanide-bridged trigonal bipyramidal complex. Dalton Transactions. 45(43). 17104–17107. 20 indexed citations

17.

Ueda, Akira, Shota Yamada, T. Isono, et al.. (2014). Hydrogen-Bond-Dynamics-Based Switching of Conductivity and Magnetism: A Phase Transition Caused by Deuterium and Electron Transfer in a Hydrogen-Bonded Purely Organic Conductor Crystal. Journal of the American Chemical Society. 136(34). 12184–12192. 129 indexed citations

18.

Horiuchi, Sachio, Y. Tokunaga, Gianluca Giovannetti, et al.. (2010). Above-room-temperature ferroelectricity in a single-component molecular crystal. Nature. 463(7282). 789–792. 675 indexed citations breakdown →

19.

Kumai, Reiji, Nao Takeshita, T. Ito, et al.. (2009). Pressure-Induced Modification of Crystal Structure in NdFeAsO_ (1-y=0.85), Accompanied by Remarkable Suppression of T_c(Condensed matter: electronic structure and electrical, magnetic, and optical properties). Journal of the Physical Society of Japan. 78(1). 1 indexed citations

20.

Tomioka, Y., et al.. (2000). Magnetic and electronic properties of a single crystal of ordered double perovskite Sr_2FeMoO_6. APS. 2 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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