Details of the Researcher

PHOTO

Lee Chanhyeon
Section
Institute for Materials Research
Job title
Assistant Professor
e-Rad No.
41014038

Papers 6

  1. Ultrafast renormalization of the magnetic continuum in the proximal Kitaev quantum spin liquid H3LiIr2O6 by tr-RIXS [Invited]

    Jungho Kim, Tae-Kyu Choi, Edward Mercer, Liam T. Schmidt, Jaeku Park, Sang-Youn Park, Dogeun Jang, Seo Hyoung Chang, Ayman Said, Sae Hwan Chun, Kyeong Jun Lee, Sang Wook Lee, Hyunjeong Jeong, Hyeonhui Jeong, Chanhyeon Lee, Kwang-Yong Choi, Faranak Bahrami, Fazel Tafti, Martin Claassen, Alberto De La Torre

    Optical Materials Express　15　(7)　1395-1395　2025/06/02

    Publisher: Optica Publishing Group

    DOI： 10.1364/ome.550741 　

    eISSN： 2159-3930

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    We present the first circularly polarized non-resonant pump time-resolved resonant inelastic X-ray scattering (tr-RIXS) experiment in H3LiIr2O6, an iridium-based Kitaev system. Our calculations and experimental results are consistent with the modification of the low-energy magnetic excitations in H3LiIr2O6 only during illumination by the laser pulse. We discuss these results in a cooperative framework between the Floquet engineering of the exchange interactions and the dynamic renormalization of electron-electron correlations. However, the penetration length mismatch between the X-ray probe and laser pump and the intrinsic complexity of Kitaev magnets prevents us from unequivocally extracting towards which ground state H3LiIr2O6 is driven. We outline possible solutions to these challenges for light-driven stabilization and observation of the Kitaev quantum spin liquid limit by RIXS.

  2. Dirac spinons intermingled with singlet states in the random kagome antiferromagnet YCu 3 ( OD ) 6 + x Br 3 − x ( x = 0.5 )

    Chanhyeon Lee, Wonjun Lee, Suheon Lee, Takayoshi Yamanaka, Sungmin Jeon, Joydev Khatua, Gerald Morris, Bassam Hitti, Hiroyuki Nojiri, Kwang-Yong Choi

    Physical Review B　110　(6)　2024/08/15

    Publisher: American Physical Society (APS)

    DOI： 10.1103/physrevb.110.064418 　

    ISSN： 2469-9950

    eISSN： 2469-9969

  3. Emergence of flat bands and ferromagnetic fluctuations via orbital-selective electron correlations in Mn-based kagome metal

    Subhasis Samanta, Hwiwoo Park, Chanhyeon Lee, Sungmin Jeon, Hengbo Cui, Yong-Xin Yao, Jungseek Hwang, Kwang-Yong Choi, Heung-Sik Kim

    Nature Communications　15　(1)　2024/06/25

    Publisher: Springer Science and Business Media LLC

    DOI： 10.1038/s41467-024-49674-3 　

    eISSN： 2041-1723

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    Abstract Kagome lattice has been actively studied for the possible realization of frustration-induced two-dimensional flat bands and a number of correlation-induced phases. Currently, the search for kagome systems with a nearly dispersionless flat band close to the Fermi level is ongoing. Here, by combining theoretical and experimental tools, we present Sc 3 Mn 3 Al 7 Si 5 as a novel realization of correlation-induced almost-flat bands in the kagome lattice in the vicinity of the Fermi level. Our magnetic susceptibility, 27 Al nuclear magnetic resonance, transport, and optical conductivity measurements provide signatures of a correlated metallic phase with tantalizing ferromagnetic instability. Our dynamical mean-field calculations suggest that such ferromagnetic instability observed originates from the formation of nearly flat dispersions close to the Fermi level, where electron correlations induce strong orbital-selective renormalization and manifestation of the kagome-frustrated bands. In addition, a significant negative magnetoresistance signal is observed, which can be attributed to the suppression of flat-band-induced ferromagnetic fluctuation, which further supports the formation of flat bands in this compound. These findings broaden a new prospect to harness correlated topological phases via multiorbital correlations in 3 d -based kagome systems.

  4. Effects of Na deficiency on spin dynamics in the Mott insulating <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>Na</mml:mi><mml:mrow><mml:mn>4</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mi>Ir</mml:mi><mml:mn>3</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>8</mml:mn></mml:msub></mml:mrow></mml:math>

    Y. S. Choi, C. H. Lee, T. Kihara, H. Zheng, H. Nojiri, J. F. Mitchell, Kwang-Yong Choi

    Physical Review B　109　(14)　2024/04/05

    Publisher: American Physical Society (APS)

    DOI： 10.1103/physrevb.109.144405 　

    ISSN： 2469-9950

    eISSN： 2469-9969

  5. One-ninth magnetization plateau stabilized by spin entanglement in a kagome antiferromagnet

    Sungmin Jeon, Dirk Wulferding, Youngsu Choi, Seungyeol Lee, Kiwan Nam, Kee Hoon Kim, Minseong Lee, Tae-Hwan Jang, Jae-Hoon Park, Suheon Lee, Sungkyun Choi, Chanhyeon Lee, Hiroyuki Nojiri, Kwang-Yong Choi

    Nature Physics　20　(3)　435-441　2024/01/12

    Publisher: Springer Science and Business Media LLC

    DOI： 10.1038/s41567-023-02318-7 　

    ISSN： 1745-2473

    eISSN： 1745-2481

  6. Random-singlet-like state emergent in s = 5/2 frustrated cubic lattice

    Chanhyeon Lee, Sang-Kwon Lee, Suheon Lee, J. van Tol, Kwang-Yong Choi

    Journal of the Korean Physical Society　84　(2)　151-157　2024/01/03

    Publisher: Springer Science and Business Media LLC

    DOI： 10.1007/s40042-023-00987-4 　

    ISSN： 0374-4884

    eISSN： 1976-8524

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