研究者詳細 - 大成　誠一郎

論文 - 大成　誠一郎

分割表示 123 件中 1 - 20 件目／全件表示 >>

Giant impurity effects on charge loop current order states in kagome metals 査読有り

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

Physical Review B 111 巻頁： 075161_1 - 075161_10 2025年2月

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

Inoue D., Onari S., Kontani H.

Physical Review B 109 巻 ( 20 ) 2024年5月

記述言語：英語出版者・発行元：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 査読有り

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

Journal of the Physical Society of Japan 93 巻頁： 033704_1 - 033704_5 2024年3月

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 査読有り

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

Physical Review B 109 巻 ( 4 ) 頁： L041110_1 - L041110_6 2024年1月

Three-dimensional bond-order instability in infinite-layer nickelates due to nonlocal quantum interference 査読有り

Seiichiro Onari and Hiroshi Kontani

Physical Review B 108 巻頁： L241119_1 - L241119_6 2023年12月

Rigorous formalism for unconventional symmetry breaking in Fermi liquid theory and its application to nematicity in FeSe 査読有り

107 巻 ( 3 ) 頁： 035137_1 - 035137_16 2023年1月

Unconventional density waves and superconductivities in Fe-based superconductors and other strongly correlated electron systems 招待有り査読有り

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

Advances in Physics 107 巻 ( 3 ) 頁： 355 - 443 2023年1月

Correlation-driven electronic nematicity in the Dirac semimetal BaNiS2 査読有り

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 119 巻頁： e2212730119_1 - e2212730119_8 2022年12月

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― 招待有り査読有り

大成誠一郎、紺谷浩

固体物理 57 巻 ( 10 ) 頁： 571 - 580 2022年10月

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 招待有り査読有り

Frontiers in Physics 10 巻頁： 915619_1 - 915619_15 2022年7月

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

Tazai R, Yamakawa Y, Onari S, Kontani H

Science advances 8 巻 ( 13 ) 頁： eabl4108 2022年4月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：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査読有り

田財里奈、大成誠一郎、紺谷浩

日本物理学会誌 77 巻 ( 3 ) 頁： 145 - 154 2022年3月

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

Physical review letters 128 巻 ( 6 ) 頁： 066401 2022年2月

Discovery of mesoscopic nematicity wave in iron-based superconductors 査読有り国際共著

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

Science 373 巻 ( 6559 ) 頁： 1122 - 1125 2021年9月

Unconventional orbital charge density wave mechanism in the transition metal dichalcogenide 1T-TaS₂ 査読有り

Toru Hirata, Youichi Yamakawa, Seiichiro Onari, Hiroshi Kontani

Physical Review Research 3 巻頁： L032053_1 - L032053_6 2021年8月

Development of Spin Fluctuations under the Presence of d-wave Bond Order in Cuprate Superconductors 査読有り

Ando Satoshi, Yamakawa Youichi, Onari Seiichiro, Kontani Hiroshi

Journal of the Physical Society of Japan 90 巻 ( 6 ) 頁： 63704 - 63704 2021年6月

Electronic and crystal structures ofLnFeAsO1-xHx(Ln= La, Sm) studied by x-ray absorption spectroscopy, x-ray emission spectroscopy, and x-ray diffraction:II pressure dependence.

Yamamoto Y, Yamaoka H, Kawai T, Yoshida M, Yamaura JI, Ishii K, Onari S, Uozumi T, Hariki A, Taguchi M, Kobayashi K, Lin JF, Hiraoka N, Ishii H, Tsuei KD, Okanishi H, Iimura S, Matsuishi S, Hosono H, Mizuki J

Journal of physics. Condensed matter : an Institute of Physics journal 33 巻頁： 255603_1 - 255603_10 2021年4月

Yamamoto Y, Yamaoka H, Uozumi T, Hariki A, Onari S, Yamaura JI, Ishii K, Kawai T, Yoshida M, Taguchi M, Kobayashi K, Lin JF, Hiraoka N, Ishii H, Tsuei KD, Okanishi H, Iimura S, Matsuishi S, Hosono H, Mizuki J

Journal of physics. Condensed matter : an Institute of Physics journal 33 巻頁： 255602_1 - 255602_11 2021年4月

Odd-parity spin-loop-current order mediated by transverse spin fluctuations in cuprates and related electron systems 査読有り

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

Physical Review Research 3 巻頁： 013127_1 - 013127_12 2021年2月

Spin-fluctuation-driven B1g and B2g Bond Order and Induced In-plane Anisotropy in Magnetic Susceptibility in Cuprate Superconductors: Impact of Hot-/Cold-spot Structure on Bond-order Symmetry 査読有り

Kawaguchi Kouki, Onari Seiichiro, Kontani Hiroshi

Journal of the Physical Society of Japan 89 巻 ( 12 ) 頁： 124704_1-124704_9 2020年12月

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