物理学院 School of Physics, Nanjing University

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二维NbSe2中的超导电性和电荷密度波

2016年10月24日

报告人:物理学院 奚啸翔教授
报告时间:10月25日 中午1200
报告地点:唐楼 B501
题目:二维NbSe2中的超导电性和电荷密度波

 
摘要:Atomically thin van der Waals materials have emerged as a frontier for both fundamental physics and device applications. Although novel single-particle and excitonic properties have been extensively studied, the collective electron phenomena in these materials remain less well understood. In this talk, we will discuss superconductivity and charge-density-wave (CDW) order in atomically thin group-V transition metal dichalcogenide NbSe2 down to the monolayer limit [1,2]. Electrical transport measurements show that the superconducting transition temperature decreases monotonically with reducing the layer thickness. The temperature dependent Raman scattering, on the other hand, shows enhanced CDW order as the sample thickness reduces. Magneto-transport measurements further reveal that the in-plane upper critical field in atomically thin NbSe2 superconductors significantly exceeds the Pauli paramagnetic limit. We will discuss possible mechanisms for these phenomena and briefly report electrical tuning of the collective electronic orders in this 2D metal [3].

参考文献:
[1] X. Xi, L. Zhao, Z. Wang, H. Berger, L. Forró, J. Shan, and K. F. Mak, "Strongly enhanced charge-density-wave order in monolayer NbSe2," Nature Nanotech. 10, 765 (2015).
[2] X. Xi, Z. Wang, K. T. Law, H. Berger, L. Forró, J. Shan, and K. F. Mak, "Evidence of Ising pairing in superconducting monolayer NbSe2," Nature Phys. 12, 139 (2016).
[3] X. Xi, H. Berger, L. Forró, J. Shan, and K. F. Mak, "Gate tuning of electronic phase transitions in two-dimensional NbSe2," Phys. Rev. Lett. 117, 106801 (2016).

 
报告人简介:
奚啸翔:南京大学物理学院教授。2007年本科毕业于南京大学。2011年获美国佛罗里达大学物理学博士学位。2012至2014年于美国布鲁克海文国家实验从事博士后研究。2014至2016年为美国宾夕法尼亚州立大学物理系助理研究员。2016年入选中组部青年千人计划。目前主要研究方向为二维材料的电子性质。

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