VO2块状单晶和薄膜相变的纳米红外光谱和成像研究
Phase transition in bulk single crystals and thin films of VO2 by nano-infrared spectroscopy and imaging
摘要：
我们已经系统地研究了各种二氧化钒（VO 2）的结晶形式，包括块体单晶和取向薄膜，使用红外（IR）近场光谱成像技术。通过测量亚晶粒尺寸空间分辨率（~20 nm）的电子和声子在VO 2的红外光谱响应，我们表明，在VO 2薄膜中的外延应变不仅触发自发的局部相分离，但也导致中间电子和晶格状态，是本质上不同于那些发现在散装。还讨论了应变和对称性相关的介观相不均匀性的一般规律。这些结果为全面了解复杂的能源景观奠定了基础，这些景观可能不容易通过宏观方法确定。
英文摘要：
We have systematically studied a variety of vanadium dioxide (VO2) crystalline forms, including bulk single crystals and oriented thin films, using infrared (IR) near-field spectroscopic imaging techniques. By measuring the IR spectroscopic responses of electrons and phonons in VO2 with sub-grain-size spatial resolution (~20 nm), we show that epitaxial strain in VO2 thin films not only triggers spontaneous local phase separations but also leads to intermediate electronic and lattice states that are intrinsically different from those found in bulk. Generalized rules of strain and symmetry dependent mesoscopic phase inhomogeneity are also discussed. These results set the stage for a comprehensive understanding of complex energy landscapes that may not be readily determined by macroscopic approaches.
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