利用电子透明的电子杠杆直接原位观察VO2中结构转变驱动的致动
Direct in-situ observation of structural transition driven actuation in VO2 utilizing electron transparent cantilevers
摘要：
在经历结构相变的纳米结构中，直接成像和量化驱动可以促进我们对固态集体现象的理解。在这里，我们展示了可视化的结构相变诱导致动模型相关的绝缘体二氧化钒的电子透明的晶体管的原位菲涅耳衬度成像。我们量化突然，可逆的悬臂梁运动发生由于应力松弛整个结构的转变，从单斜相到四斜相，随着温度的升高。在这样的纳米级的悬臂梁测量的偏转可以直接与宏观应力测量晶片曲率研究以及温度依赖性的电导允许一个询问晶格动力学跨越长度尺度。
英文摘要：
Direct imaging and quantification of actuation in nanostructures that undergo structural phase transitions could advance our understanding of collective phenomena in the solid state. Here, we demonstrate visualization of structural phase transition induced actuation in a model correlated insulator vanadium dioxide by in-situ Fresnel contrast imaging of electron transparent cantilevers. We quantify abrupt, reversible cantilever motion occurring due to the stress relaxation across the structural transition from monoclinic to tetragonal phase with increasing temperature. Deflections measured in such nanoscale cantilevers can be directly correlated with macroscopic stress measurements by wafer curvature studies as well as temperature dependent electrical conduction allowing one to interrogate lattice dynamics across length scales.
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