Makoto Naka's webpage

Office: Room 6304, 6th Building, Saitama Hatoyama Campus, Tokyo Denki University

Mailing Address: Ishizaka, Hatoyama-machi, Hiki-gun, Saitama 350-0394

Research Field: Condensed Matter Physics, Theory of Strongly Correlated Electron Systems

E-mail: m-naka(at)mail.dendai.ac.jp

Educational Background/Employment:

• Apr 2022-present: Associate Professor, School of Science and Engineering, Tokyo Denki University

• Apr 2021-Mar 2022: Researcher (Associate Professor), Waseda Research Institute for Science and Engineering, Waseda University

• Apr 2017-Mar 2021: Assistant Professor, Waseda Institute for Advanced Study, Waseda University

• Apr 2015-Mar 2017: Assistant Professor, Theoretical Condensed Matter and Statistical Physics Group, Department of Physics, Tohoku University

• Apr 2014-Mar 2015: Part-time Lecturer, College of Engineering, Shibaura Institute of Technology

• Apr 2013-Mar 2015: Postdoctoral Research Associate, Center for Emergent Matter Science (CEMS), RIKEN

• Mar 2013: Ph. D. in Physics, Tohoku University

Research Interests:

• Molecular (organic) compounds

ET2X, BETS2X, H3(Cat-EDT)2, X[Pd(dmit)2]2, M(tmdt)2, Solid oxygen, Alkali superoxide, Quantum spin liquid, Charge order, Charge frustration, Long-period charge fluctuation, Charge glass, Dimer-Mott insulator, Charge degree of freedom, Electronic ferroelectricity, Collective charge excitation, Magneto-electric effect, Hydrogen-bonded system, Single-component molecular compound, Superconductivity, Spin splitting, Spin current, Spintronics, Anomalous Hall effect, Nonsymmorphic space group, Chiral molecule, FFLO state, Piezomagnetic effect, Altermagnet

• Transition metal compound

ABO3, RFe2O4, BiMO3, PbMO3, RNiO3, RCoO3, ACu3B4O12, ACrO3, RVO3, Spin frustration, Order by fluctuation, Charge excitation, Multiferroics, Magneto-electric effect, Metal-insulator transition, Valence skipper, Valence transition/crossover/fluctuation, Negative thermal expansion, Orbital degree of freedom, Orbital frustration, Spin-state degree of freedom, Spin-state transition, Excitonic insulator, Magnetic field effect, Magnetization process, Electron-lattice coupling, Spin splitting, Spin current, Spintronics, Altermagnet

Publications/Preprints:

1. Aya Nagano, Makoto Naka, Joji Nasu, and Sumio Ishihara, Theory of Layered Iron Oxide on Frustrated Geometry: Electric Polarization, Magnetoelectric Effect and Orbital State, Phys. Rev. Lett. 99, 217202-1-4 (2007).

2. Makoto Naka, Aya Nagano, and Sumio Ishihara, Magnetodielectric phenomena in a charge- and spin-frustrated system of layered iron oxide, Phys. Rev. B 77, 224441-1-15 (2008). [Editors’ Suggestion]

3. Joji Nasu, Aya Nagano, Makoto Naka, and Sumio Ishihara, Doubly degenerate orbital system in honeycomb lattice: Implication of orbital state in layered iron oxide, Phys. Rev. B 78, 024416-1-12 (2008).

4. Makoto Naka and Sumio Ishihara, Electronic Ferroelectricity in a Dimer Mott Insulator, J. Phys. Soc. Jpn. 79, 063707-1-4 (2010). [Papers of Editors’ Choice]

5. Makoto Naka and Sumio Ishihara, Collective Charge Excitation in a Dimer Mott Insulating System, J. Phys. Soc. Jpn. 82, 023701 (2013).

6. K. Itoh, H. Itoh, M. Naka, S. Saito, I. Hosako, N. Yoneyama, S. Ishihara, T. Sasaki, and S. Iwai, Collective Excitation of an Electric Dipole on a Molecular Dimer in an Organic Dimer-Mott Insulator, Phys. Rev. Lett. 110, 106401 (2013). 

7. Makoto Naka and Hitoshi Seo, Long-Period Charge Correlations in Charge-Frustrated Molecular θ-(BEDT-TTF)2X, J. Phys. Soc. Jpn. 83, 053706 (2014).

8. Makoto Naka and Sumio Ishihara, Charge Dynamics in a Correlated Fermion System on a Geometrically Frustrated Lattice, J. Phys. Soc. Jpn. 84, 023703 (2015).

9. K. Hashimoto, R. Kobayashi, H. Okamura, H. Taniguchi, Y. Ikemoto, T. Morikawa, S. Iguchi, M. Naka, S. Ishihara, and T. Sasaki, Emergence of charge degrees of freedom under high pressure in an organic dimer-Mott insulator β'-(BEDT-TTF)2ICl2, Phys. Rev. B 92, 085149 (2015).

10. Makoto Naka, Hitoshi Seo, and Yukitoshi Motome, Theory of Valence Transition in BiNiO3, Phys. Rev. Lett. 116, 056402 (2016).

11. Makoto Naka and Sumio Ishihara, Magnetoelectric effect in organic molecular solids, Sci. Rep. 6, 20781 (2016).

12. M. Yoshida, K. Ishii, M. Naka, S. Ishihara, I. Jarrige, K. Ikeuchi, Y. Murakami, K. Kubo, Y. Koike, T. Nagata, Y. Fukuda, N. Ikeda, and J. Mizuki, Observation of momentum-resolved charge fluctuation proximate to the charge-order phase using resonant inelastic x-ray scattering, Sci. Rep. 6, 23611 (2016). 

13. Makoto Naka and Sumio Ishihara, Quantum melting of magnetic order in an organic dimer Mott-insulating system, Phys. Rev. B 93, 195114 (2016).

14. Joji Nasu, Tsutomu Watanabe, Makoto Naka, and Sumio Ishihara, Phase diagram and collective excitation in excitonic insulator: from the orbital physics viewpoint, Phys. Rev. B 93, 205136 (2016).

15. Taro Tatsuno, Eriko Mizoguchi, Joji Nasu, Makoto Naka, and Sumio Ishihara, Magnetic field effects in a correlated electron system with spin-state degree of freedom -Implication of an excitonic insulator-, J. Phys. Soc. Jpn. 85, 083706 (2016).

16. Naomichi Sato, Tsutomu Watanabe, Makoto Naka, and Sumio Ishihara, Spin and charge fluctuations near metal-insulator transition in dimer-type molecular solid, J. Phys. Soc. Jpn. 86, 053701 (2017). 

17. M. Shimozawa, K. Hashimoto, A. Ueda, Y. Suzuki, K. Sugii, S. Yamada, Y. Imai, R. Kobayashi, K. Itoh, S. Iguchi, M. Naka, S. Ishihara, H. Mori, T. Sasaki, and M. Yamashita, Quantum-disordered state of magnetic and electric dipoles in a hydrogen-bonded organic Mott insulator, Nat. Commun. 8, 1821 (2017).

18. Masaki Azuma, Yuki Sakai, Takumi Nishikubo, Masaichiro Mizumaki, Tetsu Watanuki, Takashi Mizokawa, Kengo Oka, Hajime Hojo, and Makoto Naka, Systematic charge distribution changes in Bi- and Pb- 3d transition metal perovskites, Dalton Trans. 47, 1371 (2018). 

19. Makoto Naka, Eriko Mizoguchi, Joji Nasu, and Sumio Ishihara, Magnetoelectric Effect in a Spin-State Transition System, J. Phys. Soc. Jpn. 87, 063709 (2018).

20. Makoto Naka and Sumio Ishihara, Electronic state and optical response in a hydrogen-bonded molecular conductor, Phys. Rev. B 97, 245110 (2018).

21. Makoto Naka, Satoru Hayami, Hiroaki Kusunose, Yuki Yanagi, Yukitoshi Motome, and Hitoshi Seo, Spin current generation in organic antiferromagnetic, Nat. Commun. 10,  4305 (2019). [Editors’ Highlights]

22. Kazuyoshi Yoshimi, Makoto Naka, and Hitoshi Seo, Finite Temperature Properties of Geometrically Charge Frustrated Systems, J. Phys. Soc. Jpn. 89, 034003 (2020). 

23. Hengyue Li, Junya Otsuki, Makoto Naka, and Sumio Ishihara, Optical Response in Excitonic Insulating State: Variational Cluster Approach, Phys. Rev. B 101, 125117 (2020).

24. Joji Nasu, Makoto Naka, and Sumio Ishihara, Strong enhancement of magnetic susceptibility induced by spin-nematic fluctuations in an excitonic insulating system with spin-orbit coupling, Phys. Rev. B 102, 045143 (2020).

25. Makoto Naka, Satoru Hayami, Hiroaki Kusunose, Yuki Yanagi, Yukitoshi Motome, and Hitoshi Seo, Anomalous Hall effect in κ-type organic antiferromagnetic, Phys. Rev. B 102, 075112 (2020).

26. T. Katsufuji, M. Miyake, M. Naka, M. Mochizuki, S. Kogo, T. Kajita, Y. Shimizu, M. Itoh, T. Hasegawa, S. Shimose, S. Noguchi, T. Saiki, T. Sato, and F. Kagawa, Orbital and magnetic ordering and domain-wall conduction in ferrimagnet La5Mo4O16, Phys. Rev. Research 3, 013105 (2021).

27. Makoto Naka, Yukitoshi Motome, and Hitoshi Seo, Perovskite as a spin current generator, Phys. Rev. B 103, 125114 (2021).

28. Joji Nasu and Makoto Naka, Spin Seebeck effect in nonmagnetic excitonic insulators, Phys. Rev. B 103, L121104 (2021).

29. Hitoshi Seo and Makoto Naka, Antiferromagnetic State in κ-type Molecular Conductors: Spin Splitting and Mott Gap, J. Phys. Soc. Jpn. 90, 064713 (2021).

30. Makoto Naka, Yukitoshi Motome, and Hitoshi Seo, Anomalous Hall effect in antiferromagnetic perovskites, Phys. Rev. B 106, 195149 (2022).

31. M. Matsuura, T. Sasaki, M. Naka, J. Muller, O. Stockert, A. Piovano, N. Yoneyama, M. Lang, Phonon renormalization effects accompanying the 6 K anomaly in the quantum spin liquid candidate κ-(BEDT-TTF)2Cu2(CN)3, Phys. Rev. Research 4, L042047 (2022).

32. Takahiro Misawa and Makoto Naka, Correlated topological insulator in organic antiferromagnets, Phys. Rev. B 108, L081120 (2023).

33. Shuntaro Sumita, Makoto Naka, Hitoshi Seo, Fulde-Ferrell-Larkin-Ovchinnikov state induced by antiferromagnetic order in κ-type organic conductors, Phys. Rev. Research 5, 043171 (2023).

34. Kohei Shibata, Makoto Naka, Harald O. Jeschke, and Junya Otsuki, Spin-Orbital Ordering in Alkali Superoxides, Phys. Rev. B 109, 235115 (2024). [Editors’ Suggestion]

35. Makoto Naka, Yukitoshi Motome, and Hitoshi Seo, Altermagnetic perovskites, npj spintronics 3, 1 (2025).

36. Makoto Naka, Yukitoshi Motome, Tsuyoshi Miyazaki, and Hitoshi Seo, Nonrelativistic Piezomagnetic Effect in an Organic Altermagnet, J. Phys. Soc. Jpn. 94, 082702 (2025).

37. Shuntaro Sumita, Makoto Naka, Hitoshi Seo, Phase-modulated superconductivity via altermagnetism, arXiv:2506.2297.

Proceedings:

1. Sumio Ishihara, Makoto Naka, and Joji Nasu, Spin and charge frustration in magneto-dielectric material, Journal of Physics: Conference Series 145, 012073-1-4 (2009).

2. Makoto Naka and Sumio Ishihara, Charge dynamics of electronic ferroelectricity in geometrically frustrated lattice, Journal of Physics Conference Series 320, 012083-1-6 (2011).

3. K. Itoh, H. Itoh, S. Iwai, M. Naka, S. Ishihara, S. Saito, N. Yoneyama, and T. Sasaki, Photoinduced Growth of Ferroelectric Charge Order in Organic Dimer-Mott insulator, EPJ Web of Conferences 41, 03020 (2013).

4. Makoto Naka, Hiroshi Hashimoto, and Sumio Ishihara, Dynamical properties of interacting charge system on frustrated lattices, Physica B: Condensed Matter 460, 68 (2014).

5. Satoru Hayami, Yuki Yanagi, Makoto Naka, Hitoshi Seo, Yukitoshi Motome, Hiroaki Kusunose, Multipole Description of Emergent Spin-Orbit Interaction in Organic Antiferromagnet κ-(BEDT-TTF)2Cu[N(CN)2]Cl, JPS Conf. Proc. 30, 011149-1-10 (2020).

Others:

1. 石原純夫, 中惇, 新奇な誘電体・電子型強誘電体の物性, 固体物理 46, 337-350 (2011).

2. 中惇, 妹尾仁嗣, 水牧仁一朗, 東正樹, バレンススキッパーが生み出す巨大な負熱膨張 - 裏方が主役に -, 日本物理学会誌 72, 663-668 (2017).

3. 下澤雅明, 上田顕, 橋本顕一郎, 中惇, π電子とプロトンの連動による新しい量子液体状態―絶対零度まで揺らぎ続ける電気・磁気双極子―, 固体物理 54, 43-54 (2019).

4. 中惇, 有機分子がつくるスピン流, 現代化学 588, 42-46 (2020).

5. 中惇, 有機化合物を用いたスピン流生成理論, クリーンエネルギー 29, 10-15 (2020).

6. 中惇, 有機磁性体でスピン流を作る, 日本物理学会誌 75, 416-421 (2020).

7. 中惇, 求幸年, 妹尾仁嗣, 交替磁性体のスピン分裂と交差相関, 固体物理 59, 241-265 (2024).

8. 松浦直人, 中惇, 佐々木孝彦, 分子性有機導体における格子励起の過減衰―柔らかい分子格子とパイ電子自由度の協奏 , 日本物理学会誌 79, 671-676 (2024).

Grants:

Principal Investigator:

1. Grants-in-Aid for Young Scientists (B), 16K17731 [2016-2019].

2. Waseda University Grants for Special Research Projects (Tokutei Kadai for newly-hired faculty), 2017S-191 [2017].

3. Global Institute for Materials Research Tohoku, General Research, 18K0044 [2018].

4. Global Institute for Materials Research Tohoku, General Research, 19K0019 [2019].

5. Grants-in-Aid for Scientific Research (C), 19K03723 [2019-2022].

6. Global Institute for Materials Research Tohoku, General Research, 20K0067 [2020].

7. Global Institute for Materials Research Tohoku, General Research, 202012-RDKGE-0081 [2021].

8. Global Institute for Materials Research Tohoku, General Research, 202112-RDKGE-0019 [2022].

9. Grants-in-Aid for Scientific Research (B), 23H01129 [2023-2025].

10. Global Institute for Materials Research Tohoku, General Research, 202212-RDKGE-0062  [2023].

Co-Investigator:

1. Grants-in-Aid for Scientific Research (B), 19H01833 [2019-2022], PI: T. Sasaki (IMR, Tohoku Univ.).

2. Grants-in-Aid for Scientific Research (B), 23H01114 [2023-2026], PI: T. Sasaki (IMR, Tohoku Univ.).

3. Grants-in-Aid for Scientific Research (C), 23K03333 [2023-2026], PI: H. Seo (RIKEN CEMS).

4. Grants-in-Aid for Scientific Research (A), 23K03333 [2025-2028], PI: K. Hashimoto (Univ. of Tokyo).