DOI | 10.1038/s41586-020-2051-0
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| Nagaoka ferromagnetism observed in a quantum dot plaquette |
| Yu, Yong1,2,3,4; Ma, Fei1,2,3,4,5; Luo, Xi-Yu1,2,3,4; Jing, Bo1,2,3,4; Sun, Peng-Fei1,2,3,4; Fang, Ren-Zhou1,2,3,4; Yang, Chao-Wei1,2,3,4; Liu, Hui1,2,3,4; Zheng, Ming-Yang5; Xie, Xiu-Ping5; Zhang, Wei-Jun6; You, Li-Xing6; Wang, Zhen6; Chen, Teng-Yun1,2,3,4; Zhang, Qiang1,2,3,4,5; Bao, Xiao-Hui1,2,3,4; Pan, Jian-Wei1,2,3,4
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| 2020-02-01
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发表期刊 | NATURE
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ISSN | 0028-0836
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EISSN | 1476-4687
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出版年 | 2020
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卷号 | 579期号:7800页码:528-533 |
文章类型 | Article
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语种 | 英语
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国家 | Netherlands; USA; Switzerland; Denmark; Australia |
英文关键词 | A quantum dot device designed to host four electrons is used to demonstrate Nagaoka ferromagnetism-a model of itinerant magnetism that has so far been limited to theoretical investigation.
Engineered, highly controllable quantum systems are promising simulators of emergent physics beyond the simulation capabilities of classical computers(1). An important problem in many-body physics is itinerant magnetism, which originates purely from long-range interactions of free electrons and whose existence in real systems has been debated for decades(2,3). Here we use a quantum simulator consisting of a four-electron-site square plaquette of quantum dots(4) to demonstrate Nagaoka ferromagnetism(5). This form of itinerant magnetism has been rigorously studied theoretically(6-9) but has remained unattainable in experiments. We load the plaquette with three electrons and demonstrate the predicted emergence of spontaneous ferromagnetic correlations through pairwise measurements of spin. We find that the ferromagnetic ground state is remarkably robust to engineered disorder in the on-site potentials and we can induce a transition to the low-spin state by changing the plaquette topology to an open chain. This demonstration of Nagaoka ferromagnetism highlights that quantum simulators can be used to study physical phenomena that have not yet been observed in any experimental system. The work also constitutes an important step towards large-scale quantum dot simulators of correlated electron systems.
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领域 | 地球科学
; 气候变化
; 资源环境
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收录类别 | SCI-E
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WOS记录号 | WOS:000517743700001
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WOS关键词 | ELECTRON-SPIN
; SIMULATION
; EXCHANGE
; NARROW
; MODEL
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WOS类目 | Multidisciplinary Sciences
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WOS研究方向 | Science & Technology - Other Topics
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引用统计 |
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文献类型 | 期刊论文
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条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/281064
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专题 | 地球科学 资源环境科学 气候变化
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作者单位 | 1.Univ Sci & Technol China, Hefei Natl Lab Phys Sci Microscale, Hefei, Anhui, Peoples R China; 2.Univ Sci & Technol China, Dept Modern Phys, Hefei, Anhui, Peoples R China; 3.Univ Sci & Technol China, CAS Ctr Excellence, Hefei, Anhui, Peoples R China; 4.Univ Sci & Technol China, Synerget Innovat Ctr Quantum Informat & Quantum P, Hefei, Anhui, Peoples R China; 5.Jinan Inst Quantum Technol, Jinan, Shandong, Peoples R China; 6.Chinese Acad Sci, SIMIT, State Key Lab Funct Mat Informat, Shanghai, Peoples R China
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推荐引用方式 GB/T 7714 |
Yu, Yong,Ma, Fei,Luo, Xi-Yu,et al. Nagaoka ferromagnetism observed in a quantum dot plaquette[J].
NATURE,2020,579(7800):528-533.
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APA |
Yu, Yong.,Ma, Fei.,Luo, Xi-Yu.,Jing, Bo.,Sun, Peng-Fei.,...&Pan, Jian-Wei.(2020).Nagaoka ferromagnetism observed in a quantum dot plaquette.NATURE,579(7800),528-533.
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MLA |
Yu, Yong,et al."Nagaoka ferromagnetism observed in a quantum dot plaquette".NATURE 579.7800(2020):528-533.
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