PUBLICATION

(†equal contributions, *corresponding authors)

Submitted

Ubiquitous flat bands in a Cr-based kagome superconductor

Yucheng Guo, Zehao Wang, Fang Xie, Yuefei Huang, Bin Gao, Ji Seop Oh, Han Wu, Zhaoyu Liu, Zheng Ren, Yuan Fang, Ananya Biswas, Yichen Zhang, Ziqin Yue, Cheng Hu, Chris Jozwiak, Aaron Bostwick, Eli Rotenberg, Makoto Hashimoto, Donghui Lu, Junichiro Kono, Jiun-Haw Chu, Boris I Yakobson, Robert J Birgeneau, Qimiao Si, Pengcheng Dai, Ming Yi

Submitted. (arXiv 2406.05293.)

Tunability of charge density wave in a magnetic kagome metal

Ji Seop Oh, Ananya Biswas, Mason Klemm, Hengxin Tan, Makoto Hashimoto, Donghui Lu, Binghai Yan, Pengcheng Dai, Robert J. Birgeneau, Ming Yi

Submitted. (arXiv 2404.02231.)

Accepted

2024

Observation of flat bands and Dirac cones in a pyrochlore lattice superconductor

Jianwei Huang, Chandan Setty, Liangzi Deng, Jing-Yang You, Hongxiong Liu, Sen Shao, Ji Seop Oh, Yucheng Guo, Yichen Zhang, Ziqin Yue, Jia-Xin Yin, Makoto Hashimoto, Donghui Lu, Sergey Gorovikov, Pengcheng Dai, Jonathan D. Denlinger, M. Zahid Hasan, Yuan-Ping Feng, Robert J. Birgeneau, Youguo Shi, Ching-Wu Chu, Guoqing Chang, Qimiao Si, Ming Yi

npj Quantum Mater. 9, 71 (2024).

Tailoring physical properties of crystals through synthetic temperature control: A case study for new polymorphic NbFeTe

_\textsf{2}

phases

Hanlin Wu, Sheng Li, Yan Lyu, Yucheng Guo, Wenhao Liu, Ji Seop Oh, Yichen Zhang, Sung-Kwan Mo, Clarina dela Cruz, Robert J. Birgeneau, Keith M. Taddei, Ming Yi, Li Yang, and Bing Lv

Phys. Rev. B 109, 174427 (2024).

Reversible non-volatile electronic switching in a near room temperature van der Waals ferromagnet

Han Wu, Lei Chen, Paul Malinowski, Bo Gyu Jang, Qinwen Deng, Kirsty Scott, Jianwei Huang, Jacob P. C. Ruff, Yu He, Xiang Chen, Chaowei Hu, Ziqin Yue, Ji Seop Oh, Xiaokun Teng, Yucheng Guo, Mason Klemm, Chuqiao Shi, Yue Shi, Chandan Setty, Tyler Werner, Makoto Hashimoto, Donghui Lu, Turgut Yilmaz, Elio Vescovo, Sung-Kwan Mo, Alexei Fedorov, Jonathan D. Denlinger, Yaofeng Xie, Bin Gao, Junichiro Kono, Pengcheng Dai, Yimo Han, Xiaodong Xu, Robert J. Birgeneau, Jian-Xin Zhu, Eduardo H. da Silva Neto, Liang Wu, Jiun-Haw Chu, Qimiao Si, and Ming Yi

Nat. Commun. 15, 2739 (2024).

Nanoscale visualization and spectral fingerprints of the charge order in ScV

_\textsf{6}

_\textsf{6}

distinct from other kagome metals

Siyu Cheng, Zheng Ren, Hong Li, Ji Seop Oh, Hengxin Tan, Ganesh Pokharel, Jonathan M. DeStefano, Elliott Rosenberg, Yucheng Guo, Yichen Zhang, Ziqin Yue, Yongbin Lee, Sergey Gorovikov, Marta Zonno, Makoto Hashimoto, Donghui Lu, Liqin Ke, Federico Mazzola, Junichiro Kono, R. J. Birgeneau, Jiun-Haw Chu, Stephen D. Wilson, Ziqiang Wang, Binghai Yan, Ming Yi, and Ilija Zeljkovic

npj. Quantum Mater. 9, 14 (2024).

2023

Ideal weak topological insulator and protected helical saddle points

Ji Seop Oh, Tianyi Xu, Nikhil Dhale, Sheng Li, Chao Lei, Chiho Yoon, Wenhao Liu, Jianwei Huang, Hanlin Wu, Makoto Hashimoto, Donghui Lu, Chris Jozwiak, Aaron Bostwick, Eli Rotenberg, Chun Ning Lau, Bing Lv, Fan Zhang, Robert J. Birgeneau, and Ming Yi

Phys. Rev. B 108, L201104 (2023).

Charge order in a nonsymmorphic topological crystal TaTe

_\textsf{4}

Yichen Zhang, Ruixiang Zhou, Hanlin Wu, Ji Seop Oh, Sheng Li, Jianwei Huang, Jonathan D. Denlinger, Makoto Hashimoto, Donghui Lu, Sung-Kwan Mo, Kevin F. Kelly, Gregory T. McCandless, Julia Y. Chan, Robert J. Birgeneau, Bing Lv, Gang Li, and Ming Yi

Phys. Rev. B 108, 155121 (2023).

Weyl nodal ring states and Landau quantization with very large magnetoresistance in square-net magnet EuGa

_\textsf{4}

Shiming Lei, Kevin Allen, Jianwei Huang, Jaime M. Moya, Tsz Chun Wu, Brian Casas, Yichen Zhang, Ji Seop Oh, Makoto Hashimoto, Donghui Lu, Jonathan Denlinger, Chris Jozwiak, Aaron Bostwick, Eli Rotenberg, Luis Balicas, Robert Birgeneau, Matthew S. Foster, Ming Yi, Yan Sun, and Emilia Morosan

Nat. Commun. 14, 5812 (2023).

Spectral evidence for unidirectional charge density wave in detwinned BaNi

_\textsf{2}

_\textsf{2}

Yucheng Guo, Mason Klemm, Ji Seop Oh, Yaofeng Xie, Bing-Hua Lei, Luca Moreschini, Cheng Chen, Ziqin Yue, Sergey Gorovikov, Tor Pedersen, Matteo Michiardi, Sergey Zhdanovich, Andrea Damascelli, Jonathan D. Denlinger, Makoto Hashimoto, Donghui Lu, Sung-Kwan Mo, Rob G. Moore, Junichiro Kono, Robert J. Birgeneau, David J. Singh, Pengcheng Dai, and Ming Yi

Phys. Rev. B 108, L081104 (2023).

Kramers nodal lines and Weyl fermions in SmAlSi

Yichen Zhang, Yuxiang Gao, Xue-Jian Gao, Shiming Lei, Zhuoliang Ni, Ji Seop Oh, Jianwei Huang, Ziqin Yue, Marta Zonno, Sergey Gorovikov, Makoto Hashimoto, Donghui Lu, Jonathan D. Denlinger, Robert J. Birgeneau, Junichiro Kono, Liang Wu, Kam Tuen Law, Emilia Morosan, and Ming Yi

Commun. Phys. 6, 134 (2023).

Magnetism and charge density wave order in kagome FeGe

Xiaokun Teng†, Ji Seop Oh†, Hengxin Tan, Lebing Chen, Jianwei Huang, Bin Gao, Jia-Xin Yin, Jiun-Haw Chu, Makoto Hashimoto, Donghui Lu, Chris Jozwiak, Aaron Bostwick, Eli Rotenberg, Garrett E. Granroth, Binghai Yan, Robert J. Birgeneau, Pengcheng Dai, and Ming Yi

Nat. Phys. 19, 814 (2023).

2022

Uniaxial ferromagnetism in the kagome metal TbV

_\textsf{6}

_\textsf{6}

Elliott Rosenberg, Jonathan M. DeStefano, Yucheng Guo, Ji Seop Oh, Makoto Hashimoto, Donghui Lu, Robert J. Birgeneau, Yongbin Lee, Liqin Ke, Ming Yi, and Jiun-Haw Chu

Phys. Rev. B 106, 115139 (2022).

Discovery of charge density wave in a correlated kagome lattice antiferromagnet

Xiaokun Teng, Lebing Chen, Feng Ye, Elliott Rosenberg, Zhaoyu Liu, Jia-Xin Yin, Yu-Xiao Jiang, Ji Seop Oh, M. Zahid Hasan, Kelly J. Neubauer, Bin Gao, Yaofeng Xie, Makoto Hashimoto, Donghui Lu, Chris Jozwiak, Aaron Bostwick, Eli Rotenberg, Robert J. Birgeneau, Jiun-Haw Chu, Ming Yi, and Pengcheng Dai

Nature 690, 490 (2022).

Nonsymmorphic symmetry-protected band crossings in a square-net metal PtPb

_\textsf{4}

Han Wu, Alannah M. Hallas, Xiaochan Cai, Jianwei Huang, Ji Seop Oh, Vaideesh Loganathan, Ashley Weiland, Gregory T. McCandless, Julia Y. Chan, Sung-Kwan Mo, Donghui Lu, Makoto Hashimoto, Jonathan Denlinger, Robert J. Birgeneau, Andriy H. Nevidomskyy, Gang Li, Emilia Morosan, and Ming Yi

npj Quantum Mater. 7, 31 (2022).

Correlation-driven electronic reconstruction in FeTe

_\textsf{1-x}

_\textsf{x}

Jianwei Huang, Rong Yu, Zhijun Xu, Jian-Xin Zhu, Ji Seop Oh, Qianni Jiang, Meng Wang, Han Wu, Tong Chen, Jonathan D. Denlinger, Sung-Kwan Mo, Makoto Hashimoto, Matteo Michiardi, Tor M. Pedersen, Sergey Gorovikov, Sergey Zhdanovich, Andrea Damascelli, Genda Gu, Pengcheng Dai, Jiun-Haw Chu, Donghui Lu, Qimiao Si, Robert J. Birgeneau, and Ming Yi

Commun. Phys. 5, 29 (2022).

Gate-tunable transport in quasi-one-dimensional α -Bi

_\textsf{4}

_\textsf{4}

field effect transistors

Yulu Liu, Ruoyu Chen, Zheneng Zhang, Marc Bockrath, Chun Ning Lau, Yan-Feng Zhou, Chiho Yoon, Sheng Li, Xiaoyuan Liu, Nikhil Dhale, Bing Lv, Fan Zhang, Kenji Watanabe, Takashi Taniguchi, Jianwei Huang, Ming Yi, Ji Seop Oh, and Robert J. Birgeneau

Nano Lett. 22, 1151 (2022).

2021

Sign-tunable anomalous Hall effect induced by two-dimensional symmetry-protected nodal structures in ferromagnetic perovskite thin films

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, and Changyoung Kim

Nat. Mater. 20, 1643 (2021).

Transport anomalies in the layered compound BaPt

_\textsf{4}

_\textsf{6}

Sheng Li, Yichen Zhang, Hanlin Wu, Huifei Zhai, Wenhao Liu, Daniel Peirano Petit, Ji Seop Oh, Jonathan Denlinger, Gregory T. McCandless, Julia Y. Chan, Robert J. Birgeneau, Gang Li, Ming Yi, and Bing Lv

npj Quantum Mater. 6, 80 (2021).

Room-temperature topological phase transition in quasi-one-dimensional material Bi

_\textsf{4}

_\textsf{4}

Jianwei Huang, Sheng Li, Chiho Yoon, Ji Seop Oh, Han Wu, Xiaoyuan Liu, Nikhil Dhale, Yan-Feng Zhou, Yucheng Guo, Yichen Zhang, Makoto Hashimoto, Donghui Lu, Jonathan Denlinger, Xiqu Wang, Chun Ning Lau, Robert J. Birgeneau, Fan Zhang, Bing Lv, and Ming Yi

Phys. Rev. X 11, 031042 (2021).

2020

Visualizing orbital content of electronic bands in anisotropic 2D semiconducting ReSe

_\textsf{2}

Byoung Ki Choi, Søren Ulstrup, Surani M. Gunasekera, Jiho Kim, Soo Yeon Lim, Luca Moreschini, Ji Seop Oh, Seung-Hyung Chun, Chris Jozwiak, Aaron Bostwick, Eli Rotenberg, Hyeonsik Cheong, In-Whan Lyo, Marcin Mucha-Kruczynski, and Young Jun Chang

ACS Nano 14, 7880 (2020).

2018

Volatile 2D electron gas in ultrathin BaTiO

_\textsf{3}

films

Peter Lutz, Simon Moser, Vedran Jovic, Young Jun Chang, Roland J. Koch, Søren Ulstrup, Ji Seop Oh, Luca Moreschini, Sara Fatale, Marco Grioni, Chris Jozwiak, Aaron Bostwick, Eli Rotenberg, Hendrik Bentmann, and Friedrich Reinert

Phys. Rev. Mater. 2, 094411 (2018).

Evidence for absence of metallic surface states in BiO

_\textsf{2}

-terminated BaBiO

_\textsf{3}

thin films

Ji Seop Oh, Minu Kim, Gideok Kim, Han Gyeol Lee, Hyang Keun Yoo, Soobin Sinn, Young Jun Chang, Moonsup Han, Chris Jozwiak, Aaron Bostwick, Eli Rotenberg, Hyeong-Do Kim, and Tae Won Noh

Curr. Appl. Phys. 18, 658 (2018).

How to extract the surface potential profile from the ARPES signature of a 2DEG

S. Moser, V. Jovic, R. Koch, L. Moreschini, J.-S. Oh, C. Jozwiak, A. Bostwick, and E. Rotenberg

J. Electron Spectrosc. Relat. Phenom. 225, 16 (2018).

2017

Element-specific orbital character in a nearly-free-electron superconductor Ag

_\textsf{5}

_\textsf{2}

_\textsf{6}

revealed by core-level photoemission

Soobin Sinn, Kyung Dong Lee, Choong Jae Won, Ji Seop Oh, Moonsup Han, Young Jun Chang, Namjung Hur, Byeong-Gyu Park, Changyoung Kim, Hyeong-Do Kim, and Tae Won Noh

Sci. Rep. 7, 4528 (2017).

2016

Electronic structure of the Kitaev material α -RuCl

_\textsf{3}

probed by photoemission and inverse photoemission spectroscopies

Soobin Sinn, Choong Hyun Kim, Beom Hyun Kim, Kyung Dong Lee, Choong Jae Won, Ji Seop Oh, Moonsup Han, Young Jun Chang, Namjung Hur, Hitoshi Sato, Byeong-Gyu Park, Changyoung Kim, Hyeong-Do Kim, and Tae Won Noh

Sci. Rep. 6, 39544 (2016).

Manifestations of quasi-two-dimensional metallicity in a layered ternary transition metal chalcogenide Ti

_\textsf{2}

PTe

_\textsf{2}

Ji Seop Oh†, Ho-Sung Yu†, Chang-Jong Kang, Soobin Sinn, Moonsup Han, Young Jun Chang, Byeong-Gyu Park, Kimoon Lee, Byung Il Min, Sung Wng Kim, Hyeong-Do Kim, and Tae Won Noh

Chem. Mater. 28, 7570 (2016).

Evidence for anionic excess electrons in a quasi-two-dimensional Ca

_\textsf{2}

N electride by angle-resolved photoemission spectroscopy

Ji Seop Oh, Chang-Jong Kang, Ye Ji Kim, Soobin Sinn, Moonsup Han, Young Jun Chang, Byeong-Gyu Park, Sung Wng Kim, Byung Il Min, Hyeong-Do Kim, and Tae Won Noh

J. Am. Chem. Soc. 138, 2496 (2016).

2015

Insulating-layer formation of metallic LaNiO

_\textsf{3}

on Nb-doped SrTiO

_\textsf{3}

substrate

Hyang Keun Yoo, Young Jun Chang, Luca Moreschini, Hyeong-Do Kim, Chang Hee Sohn, Soobin Sinn, Ji Seop Oh, Cheng-Tai Kuo, Aaron Bostwick, Eli Rotenberg, Tae Won Noh

Appl. Phys. Lett. 106, 121601 (2015).

2013

Origin of variation in switching voltages in threshold-switching phenomena of VO

_\textsf{2}

thin films

S. B. Lee, K. Kim, J. S. Oh, B. Kahng, and J. S. Lee

Appl. Phys. Lett. 102, 063501 (2013).

첨단 양자 물질 연구실(iQM Lab) 숙명여자대학교 신소재물리전공 서울특별시 용산구 청파로 47길 100