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Feng W, Hanke JP, Zhou X, Guo GY, Blügel S, Mokrousov Y, Yao Y. Topological magneto-optical effects and their quantization in noncoplanar antiferromagnets. Nat Commun 2020; 11:118. [PMID: 31913308 PMCID: PMC6949225 DOI: 10.1038/s41467-019-13968-8] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2019] [Accepted: 12/10/2019] [Indexed: 11/23/2022] Open
Abstract
Reflecting the fundamental interactions of polarized light with magnetic matter, magneto-optical effects are well known since more than a century. The emergence of these phenomena is commonly attributed to the interplay between exchange splitting and spin-orbit coupling in the electronic structure of magnets. Using theoretical arguments, we demonstrate that topological magneto-optical effects can arise in noncoplanar antiferromagnets due to the finite scalar spin chirality, without any reference to exchange splitting or spin-orbit coupling. We propose spectral integrals of certain magneto-optical quantities that uncover the unique topological nature of the discovered effect. We also find that the Kerr and Faraday rotation angles can be quantized in insulating topological antiferromagnets in the low-frequency limit, owing to nontrivial global properties that manifest in quantum topological magneto-optical effects. Although the predicted topological and quantum topological magneto-optical effects are fundamentally distinct from conventional light-matter interactions, they can be measured by readily available experimental techniques.
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Affiliation(s)
- Wanxiang Feng
- Key Lab of advanced optoelectronic quantum architecture and measurement (Ministry of Education), Beijing Key Lab of Nanophotonics & Ultrafine Optoelectronic Systems, and School of Physics, Beijing Institute of Technology, 100081, Beijing, China
- Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich and JARA, 52425, Jülich, Germany
| | - Jan-Philipp Hanke
- Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich and JARA, 52425, Jülich, Germany
- Institute of Physics, Johannes Gutenberg University Mainz, 55099, Mainz, Germany
| | - Xiaodong Zhou
- Key Lab of advanced optoelectronic quantum architecture and measurement (Ministry of Education), Beijing Key Lab of Nanophotonics & Ultrafine Optoelectronic Systems, and School of Physics, Beijing Institute of Technology, 100081, Beijing, China
| | - Guang-Yu Guo
- Department of Physics and Center for Theoretical Physics, National Taiwan University, Taipei, 10617, Taiwan
- Physics Division, National Center for Theoretical Sciences, Hsinchu, 30013, Taiwan
| | - Stefan Blügel
- Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich and JARA, 52425, Jülich, Germany
| | - Yuriy Mokrousov
- Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich and JARA, 52425, Jülich, Germany
- Institute of Physics, Johannes Gutenberg University Mainz, 55099, Mainz, Germany
| | - Yugui Yao
- Key Lab of advanced optoelectronic quantum architecture and measurement (Ministry of Education), Beijing Key Lab of Nanophotonics & Ultrafine Optoelectronic Systems, and School of Physics, Beijing Institute of Technology, 100081, Beijing, China.
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Zhang BB, Wang C, Dong ST, Lv YY, Zhang L, Xu Y, Chen YB, Zhou J, Yao SH, Chen YF. Preparation, Structure Evolution, and Metal–Insulator Transition of NaxRhO2 Crystals (0.25 ≤ x ≤ 1). Inorg Chem 2018; 57:2730-2735. [DOI: 10.1021/acs.inorgchem.7b03110] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Bin-Bin Zhang
- National Laboratory of Solid State Microstructures Department of Materials Science and Engineering, Nanjing University, Nanjing 210093, People’s Republic of China
- Key Laboratory of Radiation Detection Materials and Devices, Ministry of Industry and Information Technology, School of Materials Science and Engineering State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an, Shaanxi 710072, People’s Republic of China
| | - Cong Wang
- National Laboratory of Solid State Microstructures Department of Materials Science and Engineering, Nanjing University, Nanjing 210093, People’s Republic of China
| | - Song-Tao Dong
- Institute of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, People’s Republic of China
| | - Yang-Yang Lv
- National Laboratory of Solid State Microstructures Department of Materials Science and Engineering, Nanjing University, Nanjing 210093, People’s Republic of China
| | - Lunyong Zhang
- Max Planck Postech Center for Complex Phase Materials, Max Planck Postech/Korea Research Initiative (MPK), Gyeongbuk 376-73, Korea
- Max Planck Institute for Chemical Physics of Solids, Nöthnitzerstr., Dresden 40 01187, Germany
| | - Yadong Xu
- Key Laboratory of Radiation Detection Materials and Devices, Ministry of Industry and Information Technology, School of Materials Science and Engineering State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an, Shaanxi 710072, People’s Republic of China
| | - Y. B. Chen
- National Laboratory of Solid State Microstructures & Department of Physics, Nanjing University, Nanjing 210093, People’s Republic of China
| | - Jian Zhou
- National Laboratory of Solid State Microstructures Department of Materials Science and Engineering, Nanjing University, Nanjing 210093, People’s Republic of China
- Collaborative Innovation Center of Advanced Microstructure, Nanjing University, Nanjing 210093, People’s Republic of China
| | - Shu-Hua Yao
- National Laboratory of Solid State Microstructures Department of Materials Science and Engineering, Nanjing University, Nanjing 210093, People’s Republic of China
- Collaborative Innovation Center of Advanced Microstructure, Nanjing University, Nanjing 210093, People’s Republic of China
| | - Yan-Feng Chen
- National Laboratory of Solid State Microstructures Department of Materials Science and Engineering, Nanjing University, Nanjing 210093, People’s Republic of China
- Collaborative Innovation Center of Advanced Microstructure, Nanjing University, Nanjing 210093, People’s Republic of China
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Zhou J, Liang QF, Weng H, Chen YB, Yao SH, Chen YF, Dong J, Guo GY. Predicted Quantum Topological Hall Effect and Noncoplanar Antiferromagnetism in K_{0.5}RhO_{2}. PHYSICAL REVIEW LETTERS 2016; 116:256601. [PMID: 27391737 DOI: 10.1103/physrevlett.116.256601] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/26/2016] [Indexed: 06/06/2023]
Abstract
The quantum anomalous Hall (QAH) phase is a two-dimensional bulk ferromagnetic insulator with a nonzero Chern number in the presence of spin-orbit coupling (SOC) but in the absence of applied magnetic fields. Associated metallic chiral edge states host dissipationless current transport in electronic devices. This intriguing QAH phase has recently been observed in magnetic impurity-doped topological insulators, albeit, at extremely low temperatures. Based on first-principles density functional calculations, here we predict that layered rhodium oxide K_{0.5}RhO_{2} in the noncoplanar chiral antiferromagnetic state is an unconventional three-dimensional QAH insulator with a large band gap and a Néel temperature of a few tens of Kelvins. Furthermore, this unconventional QAH phase is revealed to be the exotic quantum topological Hall effect caused by nonzero scalar spin chirality due to the topological spin structure in the system and without the need of net magnetization and SOC.
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Affiliation(s)
- Jian Zhou
- National Laboratory of Solid State Microstructures and Department of Materials Science and Engineering, Nanjing University, Nanjing 210093, China
| | - Qi-Feng Liang
- Department of Physics, Shaoxing University, Shaoxing 312000, China
| | - Hongming Weng
- Beijing National Laboratory for Condensed Matter Physics, and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - Y B Chen
- National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, China
| | - Shu-Hua Yao
- National Laboratory of Solid State Microstructures and Department of Materials Science and Engineering, Nanjing University, Nanjing 210093, China
| | - Yan-Feng Chen
- National Laboratory of Solid State Microstructures and Department of Materials Science and Engineering, Nanjing University, Nanjing 210093, China
- Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China
| | - Jinming Dong
- National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, China
| | - Guang-Yu Guo
- Department of Physics, National Taiwan University, Taipei 10617, Taiwan
- Physics Division, National Center for Theoretical Sciences, Hsinchu 30013, Taiwan
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Zhang BB, Dong ST, Chen YB, Zhang LY, Zhou J, Yao SH, Gu ZB, Zhang ST, Chen YF. High temperature solution growth, chemical depotassiation and growth mechanism of KxRhO2 crystals. CrystEngComm 2013. [DOI: 10.1039/c3ce40083b] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Mittendorfer F. Low-dimensional surface oxides in the oxidation of Rh particles. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2010; 22:393001. [PMID: 21403213 DOI: 10.1088/0953-8984/22/39/393001] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
The oxidation of rhodium particles leads to the formation of low-dimensional nanostructures, namely ultrathin oxide films and stripes adsorbed on the metallic surface. These structures display unique electronic and structural properties, which have been studied in detail experimentally and theoretically in recent years. In this review, the state of research on low-dimensional surface oxides formed on Rh surfaces will be discussed with a special focus on the contributions derived from computational approaches. Several points elucidating the novel properties of the surface oxides will be addressed: (i) the structural relation between the surface oxides and their bulk counterparts, (ii) the electronic properties of the low-dimensional oxide films and (iii) potential catalytic and electronic applications of the surface oxides.
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Affiliation(s)
- Florian Mittendorfer
- Faculty of Physics, University of Vienna, and Center for Computational Materials Science, Sensengasse 8/12, A-1090 Vienna, Austria
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