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In‐Plane Chirality Control of a Charge Density Wave by Means of Shear Stress
Advanced Materials ( IF 27.4 ) Pub Date : 2024-11-16 , DOI: 10.1002/adma.202410950
Weiyan Qi, Stefano Ponzoni, Guénolé Huitric, Romain Grasset, Yannis Laplace, Laurent Cario, Alberto Zobelli, Marino Marsi, Evangelos Papalazarou, Alexandr Alekhin, Yann Gallais, Azzedine Bendounan, Suk Hyun Sung, Noah Schnitzer, Berit Hansen Goodge, Robert Hovden, Luca Perfetti

The transition metal dichalcogenide 1T‐TaS2 exhibits a Charge Density Wave (CDW) with in‐plane chirality. Due to the rich phase diagram, the Ferro‐Rotational Order (FRO) can be tuned by external stimuli. The FRO is studied by Angle‐Resolved Photoelectron Spectroscopy (ARPES), Raman spectroscopy, and Selected Area Electron Diffraction (SAED). The in‐plane chirality of the CDW is lost at the transition from Nearly‐Commensurate (NC) to In‐Commensurate (IC) phase and can be controlled by applying shear stress to the sample while cooling it through the transition from IC‐CDW to NC‐CDW. Based on these observations, a protocol is proposed to achieve reliable, non‐volatile state switching of the FRO configuration in 1T‐TaS2 bulk crystals. These results pave the way for new functional devices in which in‐plane chirality can be set on demand.

中文翻译:


通过剪切应力对电荷密度波进行面内手性控制



过渡金属二硫化物 1T-TaS2 表现出具有面内手性的电荷密度波 (CDW)。由于相图丰富,铁旋转阶次 (FRO) 可以通过外部刺激进行调整。FRO 通过角分辨光电子能谱 (ARPES)、拉曼光谱和选定区域电子衍射 (SAED) 进行研究。CDW 的面内手性在从近相 (NC) 到相相 (IC) 的转变中丢失,可以通过对样品施加剪切应力来控制,同时在从 IC-CDW 到 NC-CDW 的转变中冷却样品。基于这些观察结果,提出了一种方案,可以在 1T-TaS2 块状晶体中实现 FRO 构型的可靠、非易失性状态切换。这些结果为新的功能设备铺平了道路,其中面内手性可以按需设置。
更新日期:2024-11-16
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