Absorption dichroism of monolayer 1T′-MoTe2 in visible range
Absorption dichroism of monolayer 1T′-MoTe2 in visible range
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DOI：
10.1088/2053-1583/3/3/031010
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发表时间：
2016-09-01
期刊：
影响因子：
5.5
通讯作者：
Lee, Young Hee
中科院分区：
文献类型：
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作者：
Han, Gang Hee;Keum, Dong Hoon;Lee, Young Hee
在各种过渡金属二硫属化物中，MoTe2因其在半导体（2H）和半金属扭曲八面体（1T'）相之间稳健的相工程能力而受到关注。特别是，1T'-MoTe2 被预测具有有趣的物理特性，例如量子自旋霍尔。绝缘体、大磁阻、超导。最近的进展显示1T'-MoTe2的弱反定域行为是拓扑绝缘体的代表性特征之一。在这里，我们通过化学气相沉积在 SiO2/Si 基底上生长厘米级单层 1T'-MoTe2，并在可见光范围内表现出二色性。带状 1T'-MoTe2 薄片最初在 SiO2 基底上随机成核，并在后期合并以在整个基底上形成连续的单层薄膜。每个薄片都显示出一维Mo-Mo二聚特征和可见光范围（400-600 nm）的各向异性吸收行为。这使我们能够由于不同方向的薄片之间的鲜明对比差异而检测到晶界。
Among various transition metal dichalcogenides, MoTe2 has drawn attention due to its capability of robust phase engineering between semiconducting (2H) and semi-metallic distorted octahedral (1T') phase. In particular, 1T'-MoTe2 has been predicted to have intriguing physics such as quantum spin Hall. insulator, large magnetoresistance, and superconductivity. Recent progress showed weak antilocalization behavior in 1T'-MoTe2 which is the one of representative characteristics in topological insulator. Here, we grow centimeter-scale monolayer 1T'-MoTe2 on SiO2/Si substrate via chemical vapordeposition and demonstrate dichroism in visible range. Ribbon-like 1T'-MoTe2 flakes were initially nucleated randomly on SiO2 substrate and at a later stage merged to form a continuous monolayer film over the entire substrate. Each flake revealed one dimensional Mo-Mo dimerization feature and anisotropic absorption behavior in visible range (400-600 nm). This allowed us to detect the grain boundary due to stark contrast difference among flakes in different orientations.