تقرير
Effect of inhomogeneities and substrate on the dynamics of the metal-insulator transition in VO$_2$ thin films
| العنوان: | Effect of inhomogeneities and substrate on the dynamics of the metal-insulator transition in VO$_2$ thin films |
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| المؤلفون: | Rodriguez-Vega, M., Simons, M. T., Radue, E., Kittiwatanakul, S., Lu, J., Wolf, S. A., Lukaszew, R. A., Novikova, I., Rossi, E. |
| المصدر: | Phys. Rev. B 92, 115420 (2015) |
| سنة النشر: | 2015 |
| المجموعة: | Condensed Matter Physics (Other) |
| مصطلحات موضوعية: | Condensed Matter - Materials Science, Physics - Optics |
| الوصف: | We study the thermal relaxation dynamics of VO$_2$ films after the ultrafast photo-induced metal-insulator transition for two VO$_2$ film samples grown on Al$_2$O$_3$ and TiO$_2$ substrates. We find two orders of magnitude difference in the recovery time (a few ns for the VO$_2$/Al$_2$O$_3$ sample vs. hundreds of ns for the VO$_2$/TiO$_2$ sample). We present a theoretical model that accurately describes the MIT thermal properties and interpret the experimental measurements. We obtain quantitative results that show how the microstructure of the VO$_2$ film and the thermal conductivity of the interface between the VO$_2$ film and the substrate affect long time-scale recovery dynamics. We also obtain a simple analytic relationship between the recovery time-scale and some of the film parameters. Comment: 10 pages, 15 figures |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1103/PhysRevB.92.115420 |
| URL الوصول: | http://arxiv.org/abs/1504.05954 |
| رقم الأكسشن: | edsarx.1504.05954 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1103/PhysRevB.92.115420 |
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