التفاصيل البيبلوغرافية
| العنوان: |
Artificial superconducting Kondo lattice in a van der Waals heterostructure. |
| المؤلفون: |
Fan, Kai, Jin, Heng, Huang, Bing, Duan, Guijing, Yu, Rong, Liu, Zhen-Yu, Xia, Hui-Nan, Liu, Li-Si, Zhang, Yao, Xie, Tao, Tang, Qiao-Yin, Chen, Gang, Zhang, Wen-Hao, Chen, F. C., Luo, X., Lu, W. J., Sun, Y. P., Fu, Ying-Shuang |
| المصدر: |
Nature Communications; 10/11/2024, Vol. 15 Issue 1, p1-8, 8p |
| مصطلحات موضوعية: |
KONDO effect, CHARGE density waves, SCANNING tunneling microscopy, MOLECULAR beam epitaxy, MESONS |
| مستخلص: |
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 3 × 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. The authors observe a coherent Kondo lattice in a monolayer of VSe2 grown on a superconducting 2H-NbSe2 substrate. Superconductivity is established in the Kondo lattice through proximity effect from the substrate. [ABSTRACT FROM AUTHOR] |
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