Research interests
Condensed matter theory. I am currently studying around the following keywords:
Quantum transport phenomena / Chirality / Topological properties in solids / Spintronics / Frustrated magnetisms
Current position
Research Scientist
Semiconductor Quantum Information Device Theory Research Team (Team Leader: Daniel Loss)
RIKEN Center for Quantum Computing (RQC)
News
2025
We will present our research in JPS annual meeting 2025 (Hiroshima University, Japanese talk) on September 16-19:
Sept. 16: Kazuki Nakazawa, Henry F. Legg, Renato M. A. Dantas, Jelena Klinovaja, and Daniel Loss, "Micoroscopic theory of the nonlinear Shubnikov-de Haas effect" (16pSK302-13).
Sept. 18: Terufumi Yamaguchi, Kazuki Nakazawa, Ai Yamakage, "Mirocsopic theory of nonlinear Edelstein effect induced by electric field and temperature gradient " (18aSK312-4).
(Finishied) We presented our research in LT30 (Bilbao, Spain) on August 8: K. Nakazawa, H. F. Legg, R. M. A. Dantas, J. Klinovaja, and D. Loss, "Theory of the nonlinear Shubnikov-de Haas effect."
(Finishied) I gave the seminar in University of Basel (Daniel Loss group) on August 6: "Probing spin-orbit interaction via nonlinear Shubnikov-de Haas effect."
(Finished) I gave the seminar in University of St Andrews (Henry F. Legg group) on July 30: "Probing spin-orbit interaction via nonlinear Shubnikov-de Haas effect."
(Finished) We presented our research in Spin Caloritronics Workshop on July 22: K. Nakazawa, T. Yamaguchi, and A. Yamakage, "Nonlinear thermoelectric transport properties induced by orbital magnetic moment in B20 compound CoSi."
Jun. 18 Our presentation at ICT/ACT 2025 received the "Materials Today Physics Outstanding Poster Award": K. Nakazawa, T. Yamaguchi, and A. Yamakage "Nonlinear thermo-electric properties in chiral tellurium."
(Finished) We presented our research in ICT/ACT 2025 (Sendai, Japan) on June 16:
(Oral talk) T. Yamaguchi, K. Nakazawa, A. Yamakage, "Microscopic Theory of Nonlinear Hall Effect Induced by Electric Field and Temperature Gradient."
(Poster presentation) K. Nakazawa, T. Yamaguchi, and A. Yamakage, "Nonlinear thermo-electric properties in chiral tellurium."
I moved to Semiconductor Quantum Information Device Theory Research Team, RIKEN Center for Quantum Computing (RQC) on April 1.
Mar. 13 Our new preprint is now available online: T. Nomoto, A. Kikkawa, K. Nakazawa, T. Yamaguchi, and F. Kagawa, "Observation of the nonlinear chiral thermoelectric Hall effect in tellurium," arXiv.2503.08058.
Mar. 12 Our paper is published: K. Nakazawa, H. F. Legg, J. Klinovaja, and D. Loss, "Interband contributions to nonlinear transport in semiconductor nanostructures," Phys. Rev. B 111, 125305 (2025).
Mar. 6 Our paper “Topological Hall effect from strong to weak coupling” is introduced in JPS Hot Topics: “A Unified Theory of Topological Hall Effect,” JPS Hot Topics 5, 016.
(Finished) I presented our research in APS Global Physics Summit (Anaheim, California, USA) on March 21: K. Nakazawa, H. F. Legg, J. Klinovaja, and D. Loss, "Interband effect to nonlinear charge response in semiconductor nanostructures" (MAR-X20-2).
Jan. 30 Our paper is published: K. Nakazawa, T. Yamaguchi, and A. Yamakage, "Nonlinear charge and thermal transport properties induced by orbital magnetic moment in chiral crystalline cobalt monosilicide," Phys. Rev. B 111, 045161 (2025).
Previous News (2024)
2024
Dec. 5 Our paper is published and selected as Editors' Suggestion: Y. Fujishiro, C. Terakura, A. Miyake, N. Kanazawa, K. Nakazawa, N. Ogawa, H. Kadobayashi, S. Kawaguchi, T. Kagayama, M. Tokunaga, Y. Kato, Y. Motome, K. Shimizu, and Y. Tokura, "Pressure-induced quantum melting of chiral spin order and subsequent transition to a degenerate semiconductor state in FeGe," Phys. Rev. B 110, L220401 (2024).
Oct. 22 Our new preprint is now available online: K. Nakazawa, H. F. Legg, J. Klinovaja, and D. Loss, "Interband contributions to nonlinear transport in semiconductor nanostructures," arXiv:2410.16639.
Oct. 1 Our new preprint is now available online: T. Yamaguchi, K. Nakazawa, and A. Yamakage, "Theory of Nonlinear Hall Effect Induced by Electric Field and Temperature Gradient in 3D Chiral Magnetic Textures," arXiv:2410.00563.
Sep. 30 Our paper is published: K. Nakazawa, T. Yamaguchi, and A. Yamakage, "Nonlinear charge transport properties in chiral tellurium," Phys. Rev. Materials 8, L091601 (2024).
Sep. 12 Our new preprint is now available online: K. Nakazawa, T. Yamaguchi, and A. Yamakage, "Nonlinear charge and thermal transport properties induced by orbital magnetic moment in chiral crystal cobalt monosilicide," arXiv:2409.08040.
(Finished) We presented our research in JPS annual meeting 2024 (Hokkaido University, Japanese talk) on September 16-19:
Y. Fujishiro, C. Terakura, A. Miyake, N. Kanazawa, K. Nakazawa, N. Ogawa, H. Kadobayashi, S. Kawaguchi, T. Kagayama, M. Tokunaga, Y. Kato, Y. Motome, K. Shimizu, and Y. Tokura, "Pressure-induced quantum phase transition and magneto-transport properties in chiral magnet FeGe" (17aE307-7).
T. Yamaguchi, K. Nakazawa, and A. Yamakage, "Theory of "extrinsic" nonlinear transport and spin transport phenomena" (17pN102-8).
K. Nakazawa, H. F. Legg, J. Klinovaja, and D. Loss, "Interband contributions to nonlinear transport in semiconductor nanostructures" (18aE318-5).
Aug. 7 Our paper is published: K. Nakazawa, Y. Kato, and Y. Motome, “Topological transitions by magnetization rotation in kagome monolayers of the ferromagnetic Weyl semimetal Co-based shandite,” Phys. Rev. B 110, 085112 (2024).
(Finished) We presented our research in Quantum Designer Physics 2024 (QDP2024) (San Sebastian, Spain) on July 19: K. Nakazawa, H. F. Legg, J. Klinovaja, and D. Loss, "Interband effect of second-order charge response to electric field in semiconductor nanostructures."
(Finished) I gave the talk in a Loss group seminar (Basel, Switzerland).
(Finished) We presented our research in International Conference on Magnetism 2024 (ICM2024) (Bologna, Italy) on July 3 and 4:
July 3: T. Yamaguchi, K. Nakazawa, A. Yamakage, "Microscopic Theory of Nonlinear Hall Effect Induced by Electric Field and Temperature Gradient," (#ICM2024_1.02_1685).
July 4: K. Nakazawa, K. Hoshi, J. J. Nakane, J. Ohe, and H. Kohno, "Topological Spin Hall Effect in Antiferromagnets Driven by Vector Néel Chirality," (#ICM2024_3.07_1682).
(Finished) I gave the invited talk entitled "Nonlinear transport properties in semiconductor nanostructures and chiral tellurium" in New Perspectives in Spintronics and Quantum transport 2024 (Kanazawa, Japan) on June 8.
(Finished) We presented our research in "Swiss-Japanese Quantum Symposium 2024" (The Univ. of. Tokyo, Japan) on June 5-6: K. Nakazawa, H. F. Legg, J. Klinovaja, and D. Loss, "Interband effect of second-order charge response to electric field in semiconductor nanostructures."
Jun. 7 Our paper is published: K. Nakazawa, K. Hoshi, J. J. Nakane, J. Ohe, and H. Kohno, "Topological Spin Hall Effect in Antiferromagnets Driven by Vector Néel Chirality," Phys. Rev. B 109, L241105 (2024).
May. 8 Our paper is published: T. Yamaguchi, K. Nakazawa, and A. Yamakage, "Microscopic Theory of Nonlinear Hall Effect Induced by Electric Field and Temperature Gradient," Phys. Rev. B 109, 205117 (2024).
Mar. 16 Our new preprint is now available online: K. Nakazawa, T. Yamaguchi, and A. Yamakage, "Nonlinear charge transport properties in chiral tellurium," arXiv:2403.10337.
Feb. 27 Our new preprint is now available online: K. Nakazawa, Y. Kato, and Y. Motome, "Topological transitions by magnetization rotation in kagome monolayers of ferromagnetic Weyl semimetal Co-based shandite," arXiv:2402.16273.
Feb. 15 Our paper "Topological Hall effect from strong to weak coupling" received The 29th Outstanding Paper Award of the Physical Society of Japan.
Feb. 5 Our paper is published: K. Nakazawa, Y. Kato, and Y. Motome, “Magnetic, transport and topological properties of Co-based shandite thin films,” Commun. Phys. 7, 48 (2024).
(Finished) We presented our research in JPS spring meeting 2024 (online, Japanese talk) on March 20:
T. Yamaguchi, K. Nakazawa, and A. Yamakage, "Microscopic theory of nonlinear transport phenomena induced by electric field and temperature gradient" (20aD1-11).
K. Nakazawa, T. Yamaguchi, and A. Yamakage, "Nonlinear transport properties in chiral Te" (20aD1-12).
K. Nakazawa, T. Yamaguchi, and A. Yamakage, "Nonlinear transport properties in B20-type compound CoSi" (20aD1-13).
(Finished) We presented our research in CEMS Symposium "Emergent Quantum Materials 2024" (Akihabara, Japan) on February 21: K. Nakazawa, T. Yamaguchi, and A. Yamakage, "Nonlinear transport properties in chiral Te" (P065).
Previous News (-2023)
2023
Oct. 8 Our new preprint is now available online: Y. Fujishiro et al., "Anomalous charge transport upon quantum melting of chiral spin order," arXiv:2310.04823.
(Finished) We presented our research in JPS meeting (Tohoku University, Japanese talk) on September 17 and 19:
T. Yamaguchi, K. Nakazawa, and A. Yamakage, "Microscopic theory of nonlinear Hall effect induced by electric field and temperature gradient in 3D chiral magnetic textures" (17pB102-9).
K. Nakazawa, Y. Kato, and Y. Motome, "Topological transitions by magnetization rotation in kagome monolayers of a ferromagnetic Weyl semimetal Co shandite" (19aA106-3).
(Finished) I presented our research in SCES2023 (Incheon, Korea) on July 4: K. Nakazawa, Y. Kato, and Y. Motome, ”Layer number dependence of topological properties in thin films of a ferromagnetic Weyl semimetal Co-based shandite”.
May. 10 Our new preprint is now available online: T. Yamaguchi, K. Nakazawa, and A. Yamakage, "Microscopic Theory of Nonlinear Hall Effect Induced by Electric Field and Temperature Gradient," arXiv:2305.05273.
I moved to Quantum System Theory Research Team, RIKEN CEMS on May 1st.
Apr. 7 Our new preprint is now available online: K. Nakazawa, K. Hoshi, J. J. Nakane, J. Ohe, and H. Kohno, "Topological Spin Hall Effect in Antiferromagnets Driven by Vector Neel Chirality", arXiv:2304.02850.
2022
(Finished) I will present our research in CMT seminar (online, Japanese talk) on April 11.
(Finished) I presented our research in APS March meeting 2023 (Las Vegas, Nevada, USA) on March 9: K. Nakazawa, Y. Kato, and Y. Motome, ”Layer number dependence of topological properties in atomically thin films of a ferromagnetic Weyl semimetal Co-based shandite”.
Contact
Room 307, Main Research Bldg.,
2-1 Hirosawa, Wako, Saitama 351-0198, Japan
E-mail: kazuki.nakazawa_at_riken.jp (please replace _at_ to @)