Akihiro Ozawa

I am a researcher conducting theoretical research on condensed matter physics.

・Inti Sodemann Group,

Institute for Theoretical Physics, Leipzig University, Germany

・ google scholar

・E-mail: akihiro.ozawa(_at_)uni-leipzig.de

Research keywords

Topological nature of electrons

Spintronics phenomena

Non-equilibrium phenomena

etc...

News

・2026/3/26 (New!)

Our new review paper on magnetic Weyl semimetals is on arXiv.

"Magnetic Weyl semimetals: Interplay of band topology and magnetism"

Akihiro Ozawa, Yasufumi Araki, Koji Kobayashi, and Kentaro Nomura [arXiv:2603.22568],

・2026/3/11 (New!)

I gave an oral presentation at the DPG meeting in Dresden, Germany.

"Emergent Fermi surfaces from non-equilibrium heat baths: exact results from Keldysh formalism"

Akihiro Ozawa & Inti Sodemann

2025

・2025/7/2

I have joined Prof. Inti Sodemann’s group at the Institute for Theoretical Physics, Leipzig University, Germany.

・2025/6/10

"Topological spin-orbit torque in ferrimagnetic Weyl semimetal" is published in Phys. Rev. Research Letter.

Tomonari Meguro, Akihiro Ozawa, Koji Kobayashi, Yasufumi Araki, and Kentaro Nomura, Phys. Rev. Research 7, L022065 (2025) [ arXiv:2409.07106 ]

・2025/6/2

"Intrinsic spin Nernst effect in topological Dirac and magnetic Weyl semimetals" is published in Phys. Rev. B.

Taiki Matsushita, Akihiro Ozawa, Yasufumi Araki, Junji Fujimoto, and Masatoshi Sato Phys. Rev. B, 111,245131 (2025), [arXiv].

・2025/6/2

"Light-induced anomalous Hall conductivity in the massive three-dimensional Dirac semimetal" is published in Phys. Rev. B, and chosen as Editors' suggestion.

Naotaka Yoshikawa*, Shun Okumura*, Yoshua Hirai, Kazuma Ogawa, Kohei Fujiwara, Junya Ikeda, Akihiro Ozawa,

Takashi Koretsune, Ryotaro Arita, Aditi Mitra, Atsushi Tsukazaki, Takashi Oka, and Ryo Shimano, Phys.Rev. B. 111, 245104 (2025)

・2025/5/23

I gave a talk at the conference "Workshop on Spinmotive force"

"Theory for spinmotive force and spin torque in magnetic Weyl semimetal"

・2025/3/23

I gave a talk at the JPS conference online.

"Theory of inverse Faraday effect in Dirac electron system" Akihiro Ozawa, and Takashi Oka

・2025/1/30

I gave a talk in Inti Sodemann group at Leipzig University, Germany.

"Magnetoelectric effect in magnetic Weyl semimetals"

2024

・2024/9/16-19

I participated in a poster session in "Materials Science of Solids and Surfaces using Radiation Field Controlled in Time/Space Domain", at the conference at the Institute for Solid State Physics, Univ of Tokyo,

・" Inverse Faraday effect with Dirac fermion" Akihiro Ozawa, and Takashi Oka

・2024/9/16-19

My collaborators and I gave talks at the Physical Society of Japan's annual meeting in Hokkaido, Japan.

・" Light-induced magnetization dynamics in topological semimetals" Akihiro Ozawa, and Takashi Oka

・ "Analysis of current-induced effective magnetic field in compensated ferrimagnetic Weyl semimetal Ti2MnAl" Tomonari Meguro, Akihiro Ozawa, Koji Kobayashi, and Kentaro Nomura

・"Intrinsic spin Nernst effect in Dirac and Weyl semimetals" Taiki Matsushita, Akihiro Ozawa, Yasufumi Araki, Junji Fujimoto, and Masatoshi Sato

・2024/9/12

A preprint about spin-orbit torque in ferrimagnetic Weyl semimetal from the topological mechanism is now available.

・"Topological spin-orbit torque in ferrimagnetic Weyl semimetal"

Tomonari Meguro, Akihiro Ozawa, Koji Kobayashi, Yasufumi Araki, and Kentaro Nomura, arXiv:2409.07106 (2024)

・2024/8/9

We published theoretical work on a chirality-dependent gauge field in a magnetic Weyl semimetal Co3Sn2S2 tight-binding model, from J. Phys. Soc. Jpn., and chosen as JPSJ editors' Choice!

・"Chiral gauge field in fully spin-polarized magnetic Weyl semimetal with magnetic domain walls "

Akihiro Ozawa, Yasufumi Araki, and Kentaro Nomura J. Phys. Soc. Jpn 93, 094704 (2024)

・2024/6/13

I gave an invited talk at Tokyo University of Science.

「磁性ワイル半金属における電磁応答の理論」

・2024/6/7-9

I joined a workshop "New perspective in spintronics and quantum transport" and gave a poster presentation.

・2024/3

My collaborator T. Meguro (Kyushu univ) and I gave talks at the American Physical Society, March meeting@Minneapolis, Minnesota.

・"Theory of chiral gauge field in fully- spin-polarized magnetic Weyl semimetal Co3Sn2S2"

Akihiro Ozawa, Yasufumi Araki, and Kentaro Nomura

・"Effective tight-binding model of compensated ferrimagnetic Weyl semimetal and analysis of spin-orbit torque"

Tomonari Meguro, Akihiro Ozawa, Koji Kobayashi, and Kentaro Nomura

・2024/2/21

I have attended a workshop, Iwate Spintronics School Winter 2024, Iwate, Japan.

・2024/2/7

Our paper on the research of orbital magnetization and anomalous Hall effect in Weyl semimetal with compensated ferrimagnetic ordering has been published.

"Effective Tight-Binding Model of Compensated Ferrimagnetic Weyl Semimetal with Spontaneous Orbital Magnetization" Tomonari Meguro, Akihiro Ozawa, Koji Kobayashi, and Kentaro Nomura J. Phys. Soc. Jpn 93, 034703 (2024)

・2024/1/22

Our paper on the research of the spin Hall effect in magnetic Weyl semimetal has been published.

"Effective model analysis for intrinsic spin Hall effect with magnetism in the Stacked Kagome Weyl Semimetal Co3Sn2S2"

Akihiro Ozawa, Koji Kobayashi, and Kentaro Nomura Phys. Rev. Applied 21, 014041(2024)

2023

・2023/9/16

My collaborators and I gave a talk at JPS annual meeting @Tohoku University, Sendai. I really enjoyed Sendai!

" 積層カゴメ磁性ワイル半金属におけるカイラルゲージ場", 小沢耀弘, 荒木康史, 野村健太郎, 講演番号19aA106-2

"補償フェリ磁性ワイル半金属の有効強束縛模型", 目黒智成, 小沢耀弘, 小林浩二, 野村健太郎, 講演番号 19aA106-4

"カゴメ格子化合物Coシャンダイトにおけるフロッケエンジニアリング" 奥村駿, 小沢耀弘, 岡隆史講演番号 18pB200-3

・2023/9/05

Phys. Rev. B paper has been press-released from Tohoku University.

トポロジカル物質の潜在的に優れた特性を理論と実験で実証 ─スピントロニクス素子のさらなる低消費電力化に期待─

・2023/8/31

My research activity plan "Theory of voltage-induced magnon in magnetic Weyl semimetal" was chosen by "Grant-in-Aid for Research Activity Start-up".

・2023/8/25 Paper for the intercorrelation between anomalous Hall effect and spin Hall effect in magnetic Weyl semimetal Co3Sn2S2 has been published.

I have conducted the theoretical calculations using two-orbital model.

We are so happy to hear that this paper is selected as Editors' Suggestion of Phys. Rev. B!

"Intercorrelated anomalous Hall and spin Hall effect in kagome-lattice Co3Sn2S2-based shandite films"

Yong-Chang Lau, Junya Ikeda, Kohei Fujiwara, Akihiro Ozawa, Jiaxin Zheng, Takeshi Seki, Kentaro Nomura, Liang Du, Quansheng Wu, Atsushi Tsukazaki, and Koki Takanashi

Phys. Rev. B 108, 064429 (2023) (Editors' Suggestion)

・2023/5/25 Preprint for model analysis for intrinsic spin Hall effect in ferromagnetic Weyl semimetal is now available. This is a collaborative work with Prof. Kentaro Nomura from Kyushu Univ. and Dr. Koji Kobayashi from Sophia Univ..

・2023/4/27 Preprint for model proposal of ferrimagnetic Weyl semimetal is now available.

This is a collaborative work with Mr. Tomonari Muguro and Prof. Kentaro Nomura from Kyushu Univ. and Dr. Koji Kobayashi from Sophia Univ..

・2023/4/1 I have started a project researcher at Institute for Solid State Physics, the University of Tokyo, Oka group.

・2023/3/31 I got a PhD degree from Tohoku University.[Title: "Theory for topological transport phenomena in magnetic Weyl semimetal" ]

・2023/3/31 Paper for spin-charge conversion in magnetic Weyl semimetal Co3Sn2S2 with Prof. Seki et al., from Tohoku Univ, has been published. I have conducted the theoretical calculations using two-orbital model.

"Enhancement of Spin-Charge Conversion Efficiency for Co3Sn2S2 across Transition from Paramagnetic to Ferromagnetic Phase"

Takeshi Seki, Yong-Chang Lau, Junya Ikeda, Kohei Fujiwara, Akihiro Ozawa, Satoshi Iihama, Kentaro Nomura, Atsushi Tsukazaki, Phys. Rev. Research 5, 013222 (2023)

・2023/3/22

I gave a talk about spin-charge transport in magnetic Weyl semimetal in JPS conference @ online. Dr. Koji Kobayashi, who is my collaborator, gave a talk about the related work as well.

" 磁性ワイル半金属Co3Sn2S2有効模型におけるスピン/異常ホール効果の理論解析", 小沢耀弘, 小林浩二, 野村健太郎, 講演番号22aD1-12, オンライン

" カゴメ層状強磁性ワイル半金属Co3Sn2S2薄膜におけるホール伝導率の数値計算",

・2023/3/08 I gave a talk in March Meeting @Las Vegas, NV.

" Theory of spin/charge transport and magnetic orderings in stacked kagome-lattice Weyl semimetal",

Akihiro Ozawa, Kentaro Nomura

・2023/2/28 Homepage restarted

Page updated

Google Sites

Report abuse