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Anomalous Behavior of 2D Janus Excitonic Layers under Extreme Pressures.
Advanced Materials ( IF 27.4 ) Pub Date : 2020-07-06 , DOI: 10.1002/adma.202002401 Han Li 1 , Ying Qin 1 , Byeongkwan Ko 2 , Dipesh B Trivedi 1 , Debarati Hajra 1 , Mohammed Yasir Sayyad 1 , Lei Liu 1 , Sang-Heon Shim 2 , Houlong Zhuang 1 , Sefaattin Tongay 1
Advanced Materials ( IF 27.4 ) Pub Date : 2020-07-06 , DOI: 10.1002/adma.202002401 Han Li 1 , Ying Qin 1 , Byeongkwan Ko 2 , Dipesh B Trivedi 1 , Debarati Hajra 1 , Mohammed Yasir Sayyad 1 , Lei Liu 1 , Sang-Heon Shim 2 , Houlong Zhuang 1 , Sefaattin Tongay 1
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Newly discovered 2D Janus transition metal dichalcogenides layers have gained much attention from a theory perspective owing to their unique atomic structure and exotic materials properties, but little to no experimental data are available on these materials. Here, experimental and theoretical studies establish the vibrational and optical behavior of 2D Janus S–W–Se and S–Mo–Se monolayers under high pressures for the first time. Chemical vapor deposition (CVD)‐grown classical transition metal dichalcogenides (TMD) monolayers are first transferred onto van der Waals (vdW) mica substrates and converted to 2D Janus sheets by surface plasma technique, and then integrated into a 500 µm size diamond anvil cell for high‐pressure studies. The results show that 2D Janus layers do not undergo phase transition up to 15 GPa, and in this pressure regime, their vibrational modes exhibit a nonmonotonic response to the applied pressures (dω/dP). Interestingly, these 2D Janus monolayers exhibit unique blueshift in photoluminescence (PL) upon compression, which is in contrast to many other traditional semiconductor materials. Overall theoretical simulations offer in‐depth insights and reveal that the overall optical response is a result of competition between the ab‐plane (blueshift) and c‐axis (redshift) compression. The overall findings shed the very first light on how 2D Janus monolayers respond under extreme pressures and expand the fundamental understanding of these materials.
中文翻译：
极端压力下二维Janus激子层的异常行为。
新发现的2D Janus过渡金属二硫化碳层由于其独特的原子结构和奇异的材料特性而在理论上引起了人们的极大关注，但这些材料的实验数据很少甚至没有。在这里，实验和理论研究首次在高压下建立了二维Janus S–W–Se和S–Mo–Se单层的振动和光学行为。首先将化学气相沉积（CVD）生长的经典过渡金属二硫化碳（TMD）单层转移到范德华（vdW）云母基板上，然后通过表面等离子体技术将其转换为2D Janus片，然后集成到500 µm尺寸的金刚石砧盒中用于高压研究。结果表明，二维Janus层在15 GPa以下不会发生相变，在这种压力下，dω / dP）。有趣的是，这些2D Janus单层在压缩后表现出独特的光致发光（PL）蓝移，这与许多其他传统半导体材料形成了鲜明的对比。总体理论模拟提供了深入的见解，并揭示了总体光学响应是ab平面（blueshift）和c轴（redshift）压缩之间竞争的结果。总体研究结果首次揭示了二维Janus单层在极端压力下的反应方式，并扩展了对这些材料的基本了解。
更新日期：2020-08-18
中文翻译：
极端压力下二维Janus激子层的异常行为。
新发现的2D Janus过渡金属二硫化碳层由于其独特的原子结构和奇异的材料特性而在理论上引起了人们的极大关注，但这些材料的实验数据很少甚至没有。在这里，实验和理论研究首次在高压下建立了二维Janus S–W–Se和S–Mo–Se单层的振动和光学行为。首先将化学气相沉积（CVD）生长的经典过渡金属二硫化碳（TMD）单层转移到范德华（vdW）云母基板上，然后通过表面等离子体技术将其转换为2D Janus片，然后集成到500 µm尺寸的金刚石砧盒中用于高压研究。结果表明，二维Janus层在15 GPa以下不会发生相变，在这种压力下，dω / dP）。有趣的是，这些2D Janus单层在压缩后表现出独特的光致发光（PL）蓝移，这与许多其他传统半导体材料形成了鲜明的对比。总体理论模拟提供了深入的见解，并揭示了总体光学响应是ab平面（blueshift）和c轴（redshift）压缩之间竞争的结果。总体研究结果首次揭示了二维Janus单层在极端压力下的反应方式，并扩展了对这些材料的基本了解。
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