Kai Fan, Heng Jin, Bing Huang, Guijing Duan, Rong Yu, Zhen-Yu Liu, Hui-Nan Xia, Li-Si Liu, Yao Zhang, Tao Xie, Qiao-Yin Tang, Gang Chen, Wen-Hao Zhang, F. C. Chen, X. Luo, W. J. Lu, Y. P. Sun, Ying-Shuang Fu
{"title":"范德华异质结构中的人工超导近藤晶格","authors":"Kai Fan, Heng Jin, Bing Huang, Guijing Duan, Rong Yu, Zhen-Yu Liu, Hui-Nan Xia, Li-Si Liu, Yao Zhang, Tao Xie, Qiao-Yin Tang, Gang Chen, Wen-Hao Zhang, F. C. Chen, X. Luo, W. J. Lu, Y. P. Sun, Ying-Shuang Fu","doi":"10.1038/s41467-024-53166-9","DOIUrl":null,"url":null,"abstract":"<p>Engineering Kondo lattice with tailored functionality is desirable for elucidating the heavy fermion physics. We realize the construction of an artificial Kondo lattice/superconductor heterojunction by growing monolayer VSe<sub>2</sub> on bulk 2H-NbSe<sub>2</sub> with molecular beam epitaxy. Spectroscopic imaging scanning tunneling microscopy measurements show the emergence of a new charge density wave (CDW) phase with <span>\\(\\sqrt{3}\\times\\)</span> <span>\\(\\sqrt{3}\\)</span> periodicity on the monolayer VSe<sub>2</sub>. Unexpectedly, a pronounced Kondo resonance appears around the Fermi level, and distributes uniformly over the entire film, evidencing the formation of Kondo lattice. Density functional theory calculations suggest the existence of magnetic interstitial V atoms in VSe<sub>2</sub>/NbSe<sub>2</sub>, which play a key role in forming the CDW phase along with the Kondo lattice observed in VSe<sub>2</sub>. The Kondo origin is verified from both the magnetic field and temperature dependences of the resonance peak, yielding a Kondo temperature of ~ 44 K. Moreover, a superconducting proximity gap opens on monolayer VSe<sub>2</sub>, whose shape deviates from the function of one-band BCS superconductor, but is reproduced by model calculations with heavy electrons participating the pairing condensate. Our work lays the experimental foundation for studying interactions between the heavy fermion liquids and the superconducting condensate.</p>","PeriodicalId":19066,"journal":{"name":"Nature Communications","volume":null,"pages":null},"PeriodicalIF":14.7000,"publicationDate":"2024-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Artificial superconducting Kondo lattice in a van der Waals heterostructure\",\"authors\":\"Kai Fan, Heng Jin, Bing Huang, Guijing Duan, Rong Yu, Zhen-Yu Liu, Hui-Nan Xia, Li-Si Liu, Yao Zhang, Tao Xie, Qiao-Yin Tang, Gang Chen, Wen-Hao Zhang, F. C. Chen, X. Luo, W. J. Lu, Y. P. Sun, Ying-Shuang Fu\",\"doi\":\"10.1038/s41467-024-53166-9\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p>Engineering Kondo lattice with tailored functionality is desirable for elucidating the heavy fermion physics. We realize the construction of an artificial Kondo lattice/superconductor heterojunction by growing monolayer VSe<sub>2</sub> on bulk 2H-NbSe<sub>2</sub> with molecular beam epitaxy. Spectroscopic imaging scanning tunneling microscopy measurements show the emergence of a new charge density wave (CDW) phase with <span>\\\\(\\\\sqrt{3}\\\\times\\\\)</span> <span>\\\\(\\\\sqrt{3}\\\\)</span> periodicity on the monolayer VSe<sub>2</sub>. Unexpectedly, a pronounced Kondo resonance appears around the Fermi level, and distributes uniformly over the entire film, evidencing the formation of Kondo lattice. Density functional theory calculations suggest the existence of magnetic interstitial V atoms in VSe<sub>2</sub>/NbSe<sub>2</sub>, which play a key role in forming the CDW phase along with the Kondo lattice observed in VSe<sub>2</sub>. The Kondo origin is verified from both the magnetic field and temperature dependences of the resonance peak, yielding a Kondo temperature of ~ 44 K. Moreover, a superconducting proximity gap opens on monolayer VSe<sub>2</sub>, whose shape deviates from the function of one-band BCS superconductor, but is reproduced by model calculations with heavy electrons participating the pairing condensate. Our work lays the experimental foundation for studying interactions between the heavy fermion liquids and the superconducting condensate.</p>\",\"PeriodicalId\":19066,\"journal\":{\"name\":\"Nature Communications\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":14.7000,\"publicationDate\":\"2024-10-11\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Nature Communications\",\"FirstCategoryId\":\"103\",\"ListUrlMain\":\"https://doi.org/10.1038/s41467-024-53166-9\",\"RegionNum\":1,\"RegionCategory\":\"综合性期刊\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"MULTIDISCIPLINARY SCIENCES\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Nature Communications","FirstCategoryId":"103","ListUrlMain":"https://doi.org/10.1038/s41467-024-53166-9","RegionNum":1,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"MULTIDISCIPLINARY SCIENCES","Score":null,"Total":0}
Artificial superconducting Kondo lattice in a van der Waals heterostructure
Engineering Kondo lattice with tailored functionality is desirable for elucidating the heavy fermion physics. We realize the construction of an artificial Kondo lattice/superconductor heterojunction by growing monolayer VSe2 on bulk 2H-NbSe2 with molecular beam epitaxy. Spectroscopic imaging scanning tunneling microscopy measurements show the emergence of a new charge density wave (CDW) phase with \(\sqrt{3}\times\)\(\sqrt{3}\) periodicity on the monolayer VSe2. Unexpectedly, a pronounced Kondo resonance appears around the Fermi level, and distributes uniformly over the entire film, evidencing the formation of Kondo lattice. Density functional theory calculations suggest the existence of magnetic interstitial V atoms in VSe2/NbSe2, which play a key role in forming the CDW phase along with the Kondo lattice observed in VSe2. The Kondo origin is verified from both the magnetic field and temperature dependences of the resonance peak, yielding a Kondo temperature of ~ 44 K. Moreover, a superconducting proximity gap opens on monolayer VSe2, whose shape deviates from the function of one-band BCS superconductor, but is reproduced by model calculations with heavy electrons participating the pairing condensate. Our work lays the experimental foundation for studying interactions between the heavy fermion liquids and the superconducting condensate.
期刊介绍:
Nature Communications, an open-access journal, publishes high-quality research spanning all areas of the natural sciences. Papers featured in the journal showcase significant advances relevant to specialists in each respective field. With a 2-year impact factor of 16.6 (2022) and a median time of 8 days from submission to the first editorial decision, Nature Communications is committed to rapid dissemination of research findings. As a multidisciplinary journal, it welcomes contributions from biological, health, physical, chemical, Earth, social, mathematical, applied, and engineering sciences, aiming to highlight important breakthroughs within each domain.