تقرير
Seeing moir\'e superlattices
العنوان: | Seeing moir\'e superlattices |
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المؤلفون: | McGilly, L. J., Kerelsky, A., Finney, N. R., Shapovalov, K., Shih, E. -M., Ghiotto, A., Zeng, Y., Moore, S. L., Wu, W., Bai, Y., Watanabe, K., Taniguchi, T., Stengel, M., Zhou, L., Hone, J., Zhu, X. -Y., Basov, D. N., Dean, C., Dreyer, C. E., Pasupathy, A. N. |
سنة النشر: | 2019 |
المجموعة: | Condensed Matter |
مصطلحات موضوعية: | Condensed Matter - Mesoscale and Nanoscale Physics |
الوصف: | Moir\'e superlattices in van der Waals (vdW) heterostructures have given rise to a number of emergent electronic phenomena due to the interplay between atomic structure and electron correlations. A lack of a simple way to characterize moir\'e superlattices has impeded progress in the field. In this work we outline a simple, room-temperature, ambient method to visualize real-space moir\'e superlattices with sub-5 nm spatial resolution in a variety of twisted vdW heterostructures including but not limited to conducting graphene, insulating boron nitride and semiconducting transition metal dichalcogenides. Our method utilizes piezoresponse force microscopy, an atomic force microscope modality which locally measures electromechanical surface deformation. We find that all moir\'e superlattices, regardless of whether the constituent layers have inversion symmetry, exhibit a mechanical response to out-of-plane electric fields. This response is closely tied to flexoelectricity wherein electric polarization and electromechanical response is induced through strain gradients present within moir\'e superlattices. Moir\'e superlattices of 2D materials thus represent an interlinked network of polarized domain walls in a non-polar background matrix. Comment: 21 pages, 4 figures; updated text |
نوع الوثيقة: | Working Paper |
URL الوصول: | http://arxiv.org/abs/1912.06629 |
رقم الأكسشن: | edsarx.1912.06629 |
قاعدة البيانات: | arXiv |
الوصف غير متاح. |