Article
Chemistry, Physical
Byungmin Sohn, Eunwoo Lee, Se Young Park, Wonshik Kyung, Jinwoong Hwang, Jonathan D. Denlinger, Minsoo Kim, Donghan Kim, Bongju Kim, Hanyoung Ryu, Soonsang Huh, Ji Seop Oh, Jong Keun Jung, Dongjin Oh, Younsik Kim, Moonsup Han, Tae Won Noh, Bohm-Jung Yang, Changyoung Kim
Summary: Magnetism and spin-orbit coupling play crucial roles in topological transport phenomena in itinerant ferromagnets. Two-dimensional systems may have stable nodal structures, and perovskite oxides generally support symmetry-protected nodal lines and points in their spin-polarized band structures.
Article
Multidisciplinary Sciences
Sungyu Park, So Young Kim, Hyoung Kug Kim, Min Jeong Kim, Taeho Kim, Hoon Kim, Gyu Seung Choi, C. J. Won, Sooran Kim, Kyoo Kim, Evgeny F. Talantsev, Kenji Watanabe, Takashi Taniguchi, Sang-Wook Cheong, B. J. Kim, H. W. Yeom, Jonghwan Kim, Tae-Hwan Kim, Jun Sung Kim
Summary: Superconductivity often arises from the suppression of competing electronic orders. In this case, the authors present a contrary example showing a superconducting dome within the parent phase with a stripe charge order in IrTe2 nanoflakes, highlighting their unusual superconducting properties.
NATURE COMMUNICATIONS
(2021)
Article
Materials Science, Multidisciplinary
S. Mishra, A. Demuer, D. Aoki, I Sheikin
Summary: CeRhIn5 is a prototypical antiferromagnetic heavy-fermion compound with unique behavior in a magnetic field. Applying a magnetic field in the basal plane induces two additional phase transitions, while a new phase with pronounced in-plane electronic anisotropy emerges when the field is applied along or close to the c axis. The origin of this new phase, initially suggested to be an electronic-nematic state, remains elusive.
Article
Materials Science, Multidisciplinary
Jie Chen, Hang Li, Tengyu Guo, Peng Chen, Dongfeng Zheng, Guoqiang Yu, Yong-Chang Lau, Xuekui Xi, Wenhong Wang
Summary: We report an unusual change in the anomalous anisotropic magnetoresistance (AMR) effect in HoPtBi, where the AMR transitions from quasi-twofold to fourfold symmetry and forms a stable rotated fourfold symmetry with increasing magnetic fields. The 3D mapping experiments confirm that it is an intrinsic 3D effect. Fourier transformation analysis indicates that the superposition of C-2, C-4, and C-6 signals with phase angle transitions leads to the novel AMR. By combining the band structures and AMR features, we evaluate the possible origin of the symmetry rotation and attribute it to the topological band change. This work provides insight into the anomalous AMR effect of topological materials and has implications for understanding the evolution of topological bands in a magnetic field. We propose that other rare-earth half-Heusler alloys can potentially exhibit similar phenomena.
NPG ASIA MATERIALS
(2023)
Article
Chemistry, Physical
Jie Meng, Zhenyun Lan, Ivano E. Castelli, Kaibo Zheng
Summary: In this study, surface reconstruction in WO3 was observed using Cs-STEM, leading to the formation of pentagonal column structures. The experimental results support that high concentrations of oxygen vacancy in the step or high-index facet areas contribute to this reconstruction.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Multidisciplinary Sciences
Daniele Guerci, Jie Wang, Jiawei Zang, Jennifer Cano, Andrew Millis
Summary: We theoretically investigate the interaction between magnetism and a heavy Fermi liquid in the AB-stacked transition metal dichalcogenide bilayer system MoTe2/WSe2. The interlayer electron transfer leads to a chiral Kondo exchange, resulting in a strong dependence of the Kondo temperature on carrier concentration and anomalous Hall effect due to topological hybridization gap. Our findings provide concrete experimental predictions for ongoing experiments on MoTe2/WSe2 bilayer heterostructures and offer a controlled route to observe a topological selective Mott transition.
Article
Materials Science, Multidisciplinary
C. Girod, D. LeBoeuf, A. Demuer, G. Seyfarth, S. Imajo, K. Kindo, Y. Kohama, M. Lizaire, A. Legros, A. Gourgout, H. Takagi, T. Kurosawa, M. Oda, N. Momono, J. Chang, S. Ono, G-Q Zheng, C. Marcenat, L. Taillefer, T. Klein
Summary: The specific heat C of cuprate superconductors La2-xSrxCuO4 and Bi2+ySr2-x-yLaxCuO6+delta was measured near the critical doping p(star), showing that at lower dopings, C-e/T values are larger, indicating the presence of quantum criticality. Additionally, the electronic specific heat in these materials exhibits a logarithmic dependence on temperature, further supporting the existence of a pseudogap critical point.
Article
Physics, Applied
Dingding Li, Ping Zhang, Hongmei Du, Zihan Wei, Wanghao Tian, Shixian Chen, Zuyu Xu, Jun Li, Yang-Yang Lyu, Hancong Sun, Guozhu Sun, Jian Chen, Biaobing Jin, Huabing Wang, Peiheng Wu
Summary: Investigated the interface between an s-wave superconductor and a type-II Wely semimetal, revealing exotic superconducting properties and providing insights into the superconducting phase in type-II Weyl semimetals.
APPLIED PHYSICS LETTERS
(2023)
Article
Physics, Multidisciplinary
S. Mishra, J. Hornung, M. Raba, J. Klotz, T. Forster, H. Harima, D. Aoki, J. Wosnitza, A. McCollam, I Sheikin
Summary: The study on CeRhIn5 material demonstrates that the Ce 4f electrons remain localized over the entire field range, ruling out significant Fermi-surface reconstruction at proposed nematic phase transition or putative quantum critical point. The results indicate the robustness of the Fermi surface inside and outside of the antiferromagnetic phase.
PHYSICAL REVIEW LETTERS
(2021)
Article
Chemistry, Applied
Hong Liu, Jian Liu, Bo Yang
Summary: This study investigates the impact of surface strain engineering on Cu(100) surface through simulation, showing that compressive strain can decrease the free energy barrier of CO dimerization, enhancing its activity, and stabilized reconstructed surface structures can be achieved through the adsorption of O or CO.
CHINESE JOURNAL OF CATALYSIS
(2022)
Article
Multidisciplinary Sciences
Jinwoong Hwang, Kyoo Kim, Canxun Zhang, Tiancong Zhu, Charlotte Herbig, Sooran Kim, Bongjae Kim, Yong Zhong, Mohamed Salah, Mohamed M. El-Desoky, Choongyu Hwang, Zhi-Xun Shen, Michael F. Crommie, Sung-Kwan Mo
Summary: In this study, the authors demonstrate the emergence of an insulating dimer ground state in monolayer 1T-IrTe2. The findings provide insights into the balance of interactions in the absence of interlayer coupling and offer new opportunities for engineering the properties of two-dimensional monolayers.
NATURE COMMUNICATIONS
(2022)
Article
Multidisciplinary Sciences
Ying-Jiun Chen, Jan-Philipp Hanke, Markus Hoffmann, Gustav Bihlmayer, Yuriy Mokrousov, Stefan Bluegel, Claus M. Schneider, Christian Tusche
Summary: The discovery of topological states of matter has revolutionized materials research, and the emergence of Weyl nodes under broken inversion symmetry is a paramount example. While systems combining magnetism with complex topological properties are elusive, the authors demonstrate the creation of giant open Fermi arcs in ultrathin hybrid magnets, where the Fermi-surface topology is modified by hybridization with a heavy-metal substrate. These findings have important implications for controlling spin and charge transport, as well as magneto-electric coupling effects.
NATURE COMMUNICATIONS
(2022)
Article
Physics, Multidisciplinary
Tobias Ritschel, Quirin Stahl, Maximilian Kusch, Jan Trinckauf, Gaston Garbarino, Volodymyr Svitlyk, Mohamed Mezouar, Junjie Yang, Sang-Wook Cheong, Jochen Geck
Summary: In this study, the structural evolution and its relationship with electronic order and molecular orbital crystal formation in doped IrTe2 materials were investigated using high-pressure single crystal X-ray diffraction and density functional theory. It was found that the local multicenter bonding in IrTe2 is driven by changes in the Ir-Te-Ir bond angle, which provides a natural explanation for the different electronic orders and is likely relevant for the superconductivity in this material.
COMMUNICATIONS PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Hiroaki Tanaka, Shota Okazaki, Kenta Kuroda, Ryo Noguchi, Yosuke Arai, Susumu Minami, Shinichiro Ideta, Kiyohisa Tanaka, Donghui Lu, Makoto Hashimoto, Viktor Kandyba, Mattia Cattelan, Alexei Barinov, Takayuki Muro, Takao Sasagawa, Takeshi Kondo
Summary: We study the mechanism of the exceptionally large anomalous Hall effect (AHE) in the noncentrosymmetric antiferromagnet CoNb3S6 and propose Weyl points near the Fermi level to cause the large AHE.
Article
Computer Science, Artificial Intelligence
Congying Sui, Kejing He, Congyi Lyu, Yun-Hui Liu
Summary: This paper presents a novel method for 3D reconstruction of dynamic objects, achieving high accuracy and robustness to motion. The method utilizes a structured-light multiplexing technique and extracted codewords to enable high-accuracy encoding, and eliminates reconstruction errors caused by motion between frames. Experimental results validate the high reconstruction accuracy and precision of the proposed method for dynamic objects with different motion speeds and types.
IEEE TRANSACTIONS ON IMAGE PROCESSING
(2022)
Article
Multidisciplinary Sciences
Junho Seo, Duck Young Kim, Eun Su An, Kyoo Kim, Gi-Yeop Kim, Soo-Yoon Hwang, Dong Wook Kim, Bo Gyu Jang, Heejung Kim, Gyeongsik Eom, Seung Young Seo, Roland Stania, Matthias Muntwiler, Jinwon Lee, Kenji Watanabe, Takashi Taniguchi, Youn Jung Jo, Jieun Lee, Byung Il Min, Moon Ho Jo, Han Woong Yeom, Si-Young Choi, Ji Hoon Shim, Jun Sung Kim
Article
Chemistry, Physical
Ji-Eun Lee, Jinwoong Hwang, Minhee Kang, Hyun-Jeong Joo, Hyejin Ryu, Kyoo Kim, Yongsam Kim, Namdong Kim, Anh Tuan Duong, Sunglae Cho, Sung-Kwan Mo, Choongyu Hwang, Imjeong Ho-Soon Yang
APPLIED SURFACE SCIENCE
(2020)
Article
Multidisciplinary Sciences
Jun-Won Rhim, Kyoo Kim, Bohm-Jung Yang
Article
Physics, Multidisciplinary
Heejung Kim, J. H. Shim, Sooran Kim, Jae-Hoon Park, Kyoo Kim, B. Min
PHYSICAL REVIEW LETTERS
(2020)
Article
Chemistry, Multidisciplinary
Trinh Thi Ly, Jungmin Park, Kyoo Kim, Hyo-Bin Ahn, Nyun Jong Lee, Kwangsu Kim, Tae-Eon Park, Ganbat Duvjir, Nguyen Huu Lam, Kyuha Jang, Chun-Yeol You, Younghun Jo, Se Kwon Kim, Changgu Lee, Sanghoon Kim, Jungdae Kim
Summary: This study investigates the microscopic structures and magnetic properties of Fe5-xGeTe2 single crystal, a promising van der Waals ferromagnet, revealing the root 3 x root 3 superstructures possibly leading to helical magnetism. The non-centrosymmetricity originating from the unique Fe atom ordering contributes to the understanding of the material's magnetic behavior.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Multidisciplinary Sciences
Sungyu Park, So Young Kim, Hyoung Kug Kim, Min Jeong Kim, Taeho Kim, Hoon Kim, Gyu Seung Choi, C. J. Won, Sooran Kim, Kyoo Kim, Evgeny F. Talantsev, Kenji Watanabe, Takashi Taniguchi, Sang-Wook Cheong, B. J. Kim, H. W. Yeom, Jonghwan Kim, Tae-Hwan Kim, Jun Sung Kim
Summary: Superconductivity often arises from the suppression of competing electronic orders. In this case, the authors present a contrary example showing a superconducting dome within the parent phase with a stripe charge order in IrTe2 nanoflakes, highlighting their unusual superconducting properties.
NATURE COMMUNICATIONS
(2021)
Article
Materials Science, Multidisciplinary
Jaewook Kim, J. Yang, C. J. Won, Kyoo Kim, Bongjae Kim, D. Obeysekera, Dong Woo Lee, Sang-Wook Cheong
Summary: By substituting Ni2+ spins with Mn2+ spins, a new phase with XY-type magnetic anisotropy is discovered in (Ni, Mn)(3)TeO6. Additionally, experimental results show that Mn ions tend to occupy specific transition-metal sites.
PHYSICAL REVIEW MATERIALS
(2021)
Article
Multidisciplinary Sciences
Jinwoong Hwang, Kyoo Kim, Canxun Zhang, Tiancong Zhu, Charlotte Herbig, Sooran Kim, Bongjae Kim, Yong Zhong, Mohamed Salah, Mohamed M. El-Desoky, Choongyu Hwang, Zhi-Xun Shen, Michael F. Crommie, Sung-Kwan Mo
Summary: In this study, the authors demonstrate the emergence of an insulating dimer ground state in monolayer 1T-IrTe2. The findings provide insights into the balance of interactions in the absence of interlayer coupling and offer new opportunities for engineering the properties of two-dimensional monolayers.
NATURE COMMUNICATIONS
(2022)
Review
Chemistry, Physical
J. D. Denlinger, J-S Kang, L. Dudy, J. W. Allen, Kyoo Kim, J-H Shim, K. Haule, J. L. Sarrao, N. P. Butch, M. B. Maple
Summary: The study investigates the relationship between narrow-band states and bulk Fermi surface topology in URu2Si2 using ARPES mapping of the electronic structure. It reveals the interaction between these states and other band states, and provides insight into the properties and temperature evolution of high symmetry points and nested Fermi-edge states, supporting the understanding of the hidden order transition.
ELECTRONIC STRUCTURE
(2022)
Article
Materials Science, Multidisciplinary
Seungho Seong, J. D. Denlinger, Kyoo Kim, B. I. Min, Y. Onuki, J. -s. Kang
Summary: The electronic structure of CeNiSn, a potential topological Kondo insulator and a Dirac nodal-loop semimetal, was investigated using temperature-dependent angle-resolved photoemission spectroscopy (ARPES). The Fermi surfaces and band structures of CeNiSn were measured for three orthogonal crystallographic planes, showing both dispersive and flat bands with Ni 3d and Ce 4f character, respectively. The measured results agree reasonably well with density functional theory (DFT) calculations. The study also reveals the importance of coherent Kondo states in determining the topological properties of CeNiSn.
Article
Materials Science, Multidisciplinary
Woori Ju, Jinwon Jeong, En-Jin Cho, Han-Jin Noh, Kyoo Kim, Byeong-Gyu Park
Summary: This study presents detailed angle-resolved photoemission measurements on the electronic structure of PdSb2, an unconventional multifold Dirac fermionic semimetal. The results show that each electron pocket and hole-pocket-like structure consists of three doubly degenerate parabolic bands, forming a sixfold Dirac fermion. Additionally, the gap size between two sextuple points is found to be highly sensitive to the Wyckoff position of Sb atoms.
Article
Materials Science, Multidisciplinary
Dong-Choon Ryu, Chang-Jong Kang, Junwon Kim, Kyoo Kim, G. Kotliar, J-S Kang, J. D. Denlinger, B. Min
Summary: Researchers explored the surface states on the nonpolar (110) surface of SmB6 using ARPES experiment and DFT band calculations, identifying them as topological surface states of topological insulator nature and topological crystalline insulator nature. They also observed a Lifshitz transition of Fermi surfaces with intriguing spin textures in the double Dirac cones of the TCI nature by varying the chemical potential, and proposed a way to probe buried Dirac points on the nearly nonpolar (111) surface.
Article
Materials Science, Multidisciplinary
Seungho Seong, Kyoo Kim, Junwon Kim, B. Min, T. Takabatake, J. D. Denlinger, J-S Kang
Article
Physics, Multidisciplinary
Dong-Choon Ryu, Junwon Kim, Kyoo Kim, Chang-Jong Kang, J. D. Denlinger, B. Min
PHYSICAL REVIEW RESEARCH
(2020)
Article
Materials Science, Multidisciplinary
Bongjae Kim, Sergii Khmelevskyi, Cesare Franchini, I. I. Mazin, Kyoo Kim
