具有巨型光学克尔非线性的1T'相变金属二甲基化物的化学稳定
Sherman J R Tan1,2, Ibrahim Abdelwahab1,2, Zijing Ding3,4
1Department of Chemistry, National University of Singapore , Singapore 117543, Singapore.
Journal of the American Chemical Society
|January 24, 2017
概括
稳定元稳定1T
科学领域:
- 材料科学
- 凝聚物质物理学
- 纳米技术
背景情况:
- 过渡金属二化物 (TMD) 具有不同的相 (2H和1T') 和不同的特性.
- 金属1T'阶段的TMD具有独特的电子和光学特性.
- 稳定TMD的元稳定1T'阶段对于实际应用至关重要.
研究的目的:
- 研究一种用于稳定TMD的1T'阶段的新方法.
- 探索阶段工程1T'-TMD的长期空气稳定性.
- 评估稳定1T'-TMD在非线性光子应用中的潜力.
主要方法:
- 在超高真空中通过化对2H-to-1T'相变的系统研究.
- 通过化使化 (LiH) 形成化.
- 密度函数理论 (DFT) 的计算和非线性光学表征.
主要成果:
- 在TMD中实现了前所未有的长期 (> 3个月) 1T' 阶段的空气稳定性.
- 在不同的金属和TMD中证明了LiH被动化方法的广泛适用性
- DFT计算证实LiH是有效的电子捐赠者,通过增强的二极管二极管相互作用稳定1T'.
结论:
- 化被动化有效地稳定了TMDs的1T'阶段,克服了转移稳定性的挑战.
- 与2H相比,空气稳定的1T'-TMD具有显著增强的光学Kerr非线性和透明度.
- 这种稳定策略为在先进的非线性光子设备中使用1T'-TMD开辟了新的途径.
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