Faculty Profiles - ONARI Seiichiro

Papers - ONARI Seiichiro

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Microscopic origin of period-four stripe charge density wave in the kagome metal CsV3Sb5 Reviewed Open Access

Yuma Murata, Rina Tazai, Youichi Yamakawa, Seiichiro Onari, and Hiroshi Kontani

Physical Review B Vol. 113 page： 155108_1 - 155108_12 2026.4

Paramagnon-Interference Mechanism for Three-Dimensional Bond Order in Kagome Metals AV3Sb5 (A=Cs, Rb, K): Analysis by the Density-Wave Equation Reviewed

Seiichiro Onari, Rina Tazai, Youichi Yamakawa, Hiroshi Kontani

Journal of the Physical Society of Japan Vol. 95 page： 044707_1 - 044707_9 2026.3

Unified mechanism of charge-density-wave and high-Tc superconductivity protected from oxygen vacancies in bilayer nickelates Reviewed Open Access

Daisuke Inoue, Youichi Yamakawa, Seiichiro Onari, Hiroshi Kontani

Communications Physics Vol. 9 page： 115_1 - 115_14 2026.2

Non-Fermi-Liquid Transport Phenomena in Infinite-Layer Nickelates Reviewed

Shinichi Hiragami and Seiichiro Onari

Journal of the Physical Society of Japan Vol. 94 page： 124706_1 - 124706_5 2025.11

Origin of switchable quasiparticle-interference chirality in loop-current phase of kagome metals measured by scanning-tunneling-microscopy Reviewed

Seigo Nakazawa, Rina Tazai, Youichi Yamakawa, Seiichiro Onari, and Hiroshi Kontani

Nature Communications Vol. 18 page： 9545_1 - 9545_11 2025.10

Giant impurity effects on charge loop current order states in kagome metals Reviewed

Seigo Nakazawa, Rina Tazai , Youichi Yamakawa, Seiichiro Onari, and Hiroshi Kontani

Physical Review B Vol. 111 page： 075161_1 - 075161_10 2025.2

Robust T -linear resistivity due to SU(4) valley and spin fluctuation mechanism in magic-angle twisted bilayer graphene Reviewed

Inoue D., Onari S., Kontani H.

Physical Review B Vol. 109 ( 20 ) 2024.5

Language：English Publisher：Physical Review B

In the magic angle twisted bilayer graphene (MATBG), non-Fermi liquidlike transport phenomena are universally observed. To understand their origin, we perform the self-consistent analysis of the self-energy due to SU(4) valley + spin fluctuations induced by the electron-electron correlation. In the SU(4) fluctuation mechanism, the 15 channels of fluctuations contribute additively to the self-energy. Therefore, the SU(4) fluctuation mechanism gives much higher electrical resistance than the spin fluctuation mechanism. By the same reason, SU(4) fluctuations of intermediate strength provide T-linear resistivity down to ∼1K. Interestingly, the T-linear resistivity is robustly realized for a wide range of electron filling, even away from the van Hove filling. This study provides a strong evidence for the importance of electron-electron correlation in MATBG.

DOI： 10.1103/PhysRevB.109.205102

Scopus

Real-Space Loop Current Pattern in Time-Reversal-Symmetry Breaking Phasein Kagome Metals Reviewed Open Access

Koki Shimura, Rina Tazai, Youichi Yamakawa, Seiichiro Onari, and Hiroshi Kontani

Journal of the Physical Society of Japan Vol. 93 page： 033704_1 - 033704_5 2024.3

Low temperature phase transitions inside the CDW phase in the kagome metals A V3Sb5 (A=Cs, Rb, K): Significance of mixed-type Fermi surface electron correlations Reviewed

J. Huang, R. Tazai, Y. Yamakawa, S. Onari, H. Kontani

Physical Review B Vol. 109 ( 4 ) page： L041110_1 - L041110_6 2024.1

Three-dimensional bond-order instability in infinite-layer nickelates due to nonlocal quantum interference Reviewed Open Access

Seiichiro Onari and Hiroshi Kontani

Physical Review B Vol. 108 page： L241119_1 - L241119_6 2023.12

Rigorous formalism for unconventional symmetry breaking in Fermi liquid theory and its application to nematicity in FeSe Reviewed Open Access

Vol. 107 ( 3 ) page： 035137_1 - 035137_16 2023.1

Unconventional density waves and superconductivities in Fe-based superconductors and other strongly correlated electron systems Invited Reviewed Open Access

Hiroshi Kontani, Rina Tazai, Youichi Yamakawa, and Seiichiro Onari

Advances in Physics Vol. 107 ( 3 ) page： 355 - 443 2023.1

Correlation-driven electronic nematicity in the Dirac semimetal BaNiS2 Reviewed Open Access

Christopher John Butler, Yuhki Kohsaka, Youichi Yamakawa, Mohammad Saeed Bahramy, Seiichiro Onari, Hiroshi Kontani, Tetsuo Hanaguri, and Shinichi Shamoto

Proceedings of the National Academy of Sciences of the United States of America Vol. 119 page： e2212730119_1 - e2212730119_8 2022.12

魔法角ツイスト2層グラフェンにおけるネマティック秩序―SU(4)揺らぎ間干渉機構― Invited Reviewed

大成誠一郎、紺谷浩

固体物理 Vol. 57 ( 10 ) page： 571 - 580 2022.10

Diverse Exotic Orders and Fermiology in Fe-Based Superconductors: A Unified Mechanism for Bg/Bg Nematicity in FeSe/(Cs,Rb)Fe2As2 and Smectic Order in BaFe2As2 Invited Reviewed Open Access

Frontiers in Physics Vol. 10 page： 915619_1 - 915619_15 2022.7

Mechanism of exotic density-wave and beyond-Migdal unconventional superconductivity in kagome metal AV3Sb5 (A = K, Rb, Cs). Reviewed Open Access

Tazai R, Yamakawa Y, Onari S, Kontani H

Science advances Vol. 8 ( 13 ) page： eabl4108 2022.4

Language：English Publishing type：Research paper (scientific journal) Publisher：Science advances

Exotic quantum phase transitions in metals, such as the electronic nematic state, have been discovered one after another and found to be universal now. The emergence of unconventional density-wave (DW) order in frustrated kagome metal AV3Sb5 and its interplay with exotic superconductivity attract increasing attention. We find that the DW in kagome metal is the bond order, because the sizable intersite attraction is caused by the quantum interference among paramagnons. This mechanism is important in kagome metals because the geometrical frustration prohibits the freezing of paramagnons. In addition, we uncover that moderate bond-order fluctuations mediate sizable pairing glue, and this mechanism gives rise to both singlet s-wave and triplet p-wave superconductivity. Furthermore, characteristic pressure-induced phase transitions in CsV3Cb5 are naturally understood by the present theory. Thus, both the exotic density wave and the superconductivity in geometrically frustrated kagome metals are explained by the quantum interference mechanism.

DOI： 10.1126/sciadv.abl4108

Scopus

PubMed

金属電子系における新規な自発的対称性の破れ Reviewed Open Access

田財里奈、大成誠一郎、紺谷浩

日本物理学会誌 Vol. 77 ( 3 ) page： 145 - 154 2022.3

SU(4) Valley+Spin Fluctuation Interference Mechanism for Nematic Order in Magic-Angle Twisted Bilayer Graphene: The Impact of Vertex Corrections Reviewed Open Access

Physical review letters Vol. 128 ( 6 ) page： 066401 2022.2

Discovery of mesoscopic nematicity wave in iron-based superconductors Reviewed International coauthorship Open Access

Shimojima T., Motoyui Y., Taniuchi T., Bareille C., Onari S., Kontani H., Nakajima M., Kasahara S., Shibauchi T., Matsuda Y., Shin S.

Science Vol. 373 ( 6559 ) page： 1122 - 1125 2021.9

Unconventional orbital charge density wave mechanism in the transition metal dichalcogenide 1T-TaS₂ Reviewed Open Access

Toru Hirata, Youichi Yamakawa, Seiichiro Onari, Hiroshi Kontani

Physical Review Research Vol. 3 page： L032053_1 - L032053_6 2021.8

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Papers - ONARI Seiichiro