Surface passivation induced a significant enhancement of superconductivity in layered two-dimensional MSi2N4 (M = Ta and Nb) materials
| Autor: | Liujiang Zhou, Xingyong Huang, Qiaoqiao Li, Luo Yan, Kui Xue, Jing Zhang, Wencai Ren, Bao-Tian Wang |
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| Rok vydání: | 2021 |
| Předmět: | |
| Zdroj: | Nanoscale. 13:18947-18954 |
| ISSN: | 2040-3372 2040-3364 |
| DOI: | 10.1039/d1nr05560g |
| Popis: | 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 (Tc) of ∼0.86 and 1.3 K. Specifically, the Tc could be greatly enhanced to ∼24.6 K by passivating the TaN2 monolayer with Si–N bilayers. Furthermore, the superconductivity could be increased 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. |
| Databáze: | OpenAIRE |
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