تقرير
Strong substrate strain effects in multilayered WS2 revealed by high-pressure optical measurements
| العنوان: | Strong substrate strain effects in multilayered WS2 revealed by high-pressure optical measurements |
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| المؤلفون: | Oliva, Robert, Woźniak, Tomasz, Junior, Paulo E. Faria, Dybała, Filip, Kopaczek, Jan, Fabian, Jaroslav, Scharoch, Paweł, Kudrawiec, Robert |
| سنة النشر: | 2022 |
| المجموعة: | Condensed Matter |
| مصطلحات موضوعية: | Condensed Matter - Materials Science, Condensed Matter - Mesoscale and Nanoscale Physics |
| الوصف: | The optical properties of two-dimensional materials can be effectively tuned by strain induced from a deformable substrate. In the present work we combine first-principles calculations based on density functional theory and the effective Bethe-Salpeter equation with high-pressure optical measurements in order to thoroughly describe the effect of strain and dielectric environment onto the electronic band structure and optical properties of a few-layered transition metal dichalcogenide. Our results show that WS2 remains fully adhered to the substrate at least up to a -0.6% in-plane compressive strain for a wide range of substrate materials. We provide a useful model to describe effect of strain on the optical gap energy. The corresponding experimentally-determined out-of-plane and in-plane stress gauge factors for WS2 monolayers are -8 and 24 meV/GPa, respectively. The exceptionally large in-plane gauge factor confirm transition metal dichalcogenides as very promising candidates for flexible functionalities. Finally, we discuss the pressure evolution of an optical transition closely-lying to the A exciton for bulk WS2 as well as the direct-to-indirect transition of the monolayer upon compression. Comment: 39 pages, 13 figures |
| نوع الوثيقة: | Working Paper |
| URL الوصول: | http://arxiv.org/abs/2202.08551 |
| رقم الأكسشن: | edsarx.2202.08551 |
| قاعدة البيانات: | arXiv |
| الوصف غير متاح. |