Electrical and thermoelectric study of two-dimensional crystal of NbSe2

doi:10.1088/1674-1056/ab9614

中国物理B ›› 2020, Vol. 29 ›› Issue (8): 87402-087402.doi: 10.1088/1674-1056/ab9614

• SPECIAL TOPIC—Ultracold atom and its application in precision measurement • 上一篇下一篇

Electrical and thermoelectric study of two-dimensional crystal of NbSe₂

Xin-Qi Li(李新祺), Zhi-Lin Li(李治林), Jia-Ji Zhao(赵嘉佶), Xiao-Song Wu(吴孝松)

1 State Key Laboratory for Artificial Microstructure and Mesoscopic Physics, Beijing Key Laboratory of Quantum Devices, Peking University, Beijing 100871, China;
2 Frontiers Science Center for Nano-optoelectronics and Collaborative Innovation Center of Quantum Matter, Beijing 100871, China

收稿日期:2020-03-15 修回日期:2020-05-07 出版日期:2020-08-05 发布日期:2020-08-05
通讯作者: Xiao-Song Wu E-mail:xswu@pku.edu.cn
基金资助:
Project supported by the National Key Basic Research Program of China (Grant No. 2016YFA0300600) and the National Natural Science Foundation of China (Grant Nos. 11574005 and 11774009).

Electrical and thermoelectric study of two-dimensional crystal of NbSe₂

Xin-Qi Li(李新祺)¹, Zhi-Lin Li(李治林)¹, Jia-Ji Zhao(赵嘉佶)¹, Xiao-Song Wu(吴孝松)^1,2

1 State Key Laboratory for Artificial Microstructure and Mesoscopic Physics, Beijing Key Laboratory of Quantum Devices, Peking University, Beijing 100871, China;
2 Frontiers Science Center for Nano-optoelectronics and Collaborative Innovation Center of Quantum Matter, Beijing 100871, China

Received:2020-03-15 Revised:2020-05-07 Online:2020-08-05 Published:2020-08-05
Contact: Xiao-Song Wu E-mail:xswu@pku.edu.cn
Supported by:
Project supported by the National Key Basic Research Program of China (Grant No. 2016YFA0300600) and the National Natural Science Foundation of China (Grant Nos. 11574005 and 11774009).

摘要/Abstract

摘要：

We report experimental investigation of the resistivity and Nernst effect in two-dimensional (2D) NbSe₂ crystals. A strongly enhanced Nernst effect, 100 times larger than that in bulk NbSe₂, caused by moving vortices is observed in thin film. It is found that in the low temperature, high magnetic field regime, pinning effects show little dependence on the thickness and resistivity of the superconductor films. Strong Nernst signals persist above the superconducting transition, suggesting that the Nernst effect is a sensitive probe to superconducting fluctuations. A magnetic field induced superconductor-insulator transition (SIT) is evident, which is surprising in that such a SIT usually takes place in disordered dirty superconductors, while our samples are highly crystalline and close to the clean limit. Hence, our results expand the scope of SIT into 2D crystal clean superconductors.

关键词: two-dimensional superconductivity, Nernst effect, superconducting fluctuations, superconductor-insulator transition

Abstract:

Key words: two-dimensional superconductivity, Nernst effect, superconducting fluctuations, superconductor-insulator transition

中图分类号: (Superconducting films and low-dimensional structures)

74.78.-w

74.25.fg (Thermoelectric effects) 74.40.Kb (Quantum critical phenomena) 74.40.-n (Fluctuation phenomena)

李新祺, 李治林, 赵嘉佶, 吴孝松. Electrical and thermoelectric study of two-dimensional crystal of NbSe₂[J]. 中国物理B, 2020, 29(8): 87402-087402.

Xin-Qi Li(李新祺), Zhi-Lin Li(李治林), Jia-Ji Zhao(赵嘉佶), Xiao-Song Wu(吴孝松). Electrical and thermoelectric study of two-dimensional crystal of NbSe₂[J]. Chin. Phys. B, 2020, 29(8): 87402-087402.

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Electrical and thermoelectric study of two-dimensional crystal of NbSe₂

Electrical and thermoelectric study of two-dimensional crystal of NbSe₂

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