Surface passivation induced a significant enhancement of superconductivity in layered two-dimensional MSi2N4 (M = Ta and Nb) materials

doi:10.1039/d1nr05560g

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	Surface passivation induced a significant enhancement of superconductivity in layered two-dimensional MSi2N4 (M = Ta and Nb) materials
	Yan, Luo 1,2; Wang, Bao-Tian 3,4; Huang, Xingyong 1; Li, Qiaoqiao 1,2; Xue, Kui 1,2; Zhang, Jing 1,2; Ren, Wencai 5,6; Zhou, Liujiang 1,2
刊名	NANOSCALE
	2021-11-25
卷号	13 期号:45 页码:18947-18954
ISSN号	2040-3364
DOI	10.1039/d1nr05560g
通讯作者	Zhou, Liujiang(ljzhou86@uestc.edu.cn)
英文摘要	Two-dimensional (2D) transition metal di-nitrides (TMN2) have been arousing great interest for their unique mechanic, electronic, optoelectronic, and magnetic properties. The recent successful growth of monolayer MSi2N4 (M = Mo and W) further motivates us to explore new physics and unusual properties behind this family. By using first-principles calculations and Bardeen-Cooper-Schrieffer theory, we predicted the existence of the superconductivity in single-layer (SL) 1T- and 1H-TaN2 with superconducting transition temperatures (T-c) of similar to 0.86 and 1.3 K. Specifically, the T-c could be greatly enhanced to similar to 24.6 K by passivating the TaN2 monolayer with Si-N bilayers. Furthermore, the superconductivity could be increased to similar to 30.4 K via substituting lighter Nb for Ta. This enhancement of superconductivity mainly stems from the softer vibration modes consisting of in-plane Ta/Nb vibrations mixed with Si-xy vibrations. The superconductivity can be further tuned by applying external strains and carrier doping. This enhancement strategy of surface passivation and light atom substitution would suggest a new platform for 2D superconductors and provide an instructive pathway for next-generation nanoelectronics.
资助项目	University of Electronic Science and Technology of China ; Natural Science Foundation of China[11675195] ; Natural Science Foundation of China[12074381]
WOS研究方向	Chemistry ; Science & Technology - Other Topics ; Materials Science ; Physics
语种	英语
出版者	ROYAL SOC CHEMISTRY
WOS记录号	WOS:000716601400001
资助机构	University of Electronic Science and Technology of China ; Natural Science Foundation of China
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/167196]
专题	金属研究所_中国科学院金属研究所
通讯作者	Zhou, Liujiang
作者单位	1.Univ Elect Sci & Technol China, Sch Phys, Chengdu 610054, Peoples R China 2.Univ Elect Sci & Technol China, Yangtze Delta Reg Inst Huzhou, Huzhou 313001, Peoples R China 3.Chinese Acad Sci, Inst High Energy Phys, Beijing 10049, Peoples R China 4.Shanxi Univ, Collaborat Innovat Ctr Extreme Opt, Taiyuan 030006, Shanxi, Peoples R China 5.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China 6.Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Yan, Luo,Wang, Bao-Tian,Huang, Xingyong,et al. Surface passivation induced a significant enhancement of superconductivity in layered two-dimensional MSi2N4 (M = Ta and Nb) materials[J]. NANOSCALE,2021,13(45):18947-18954.
APA	Yan, Luo.,Wang, Bao-Tian.,Huang, Xingyong.,Li, Qiaoqiao.,Xue, Kui.,...&Zhou, Liujiang.(2021).Surface passivation induced a significant enhancement of superconductivity in layered two-dimensional MSi2N4 (M = Ta and Nb) materials.NANOSCALE,13(45),18947-18954.
MLA	Yan, Luo,et al."Surface passivation induced a significant enhancement of superconductivity in layered two-dimensional MSi2N4 (M = Ta and Nb) materials".NANOSCALE 13.45(2021):18947-18954.