Soliton superlattices in twisted hexagonal boron nitride
| العنوان: | Soliton superlattices in twisted hexagonal boron nitride |
|---|---|
| المؤلفون: | Michael Goldflam, Y. Du, Guangxin Ni, Michael M. Fogler, Bor-Yuan Jiang, Dimitri Basov, Lingxiu Chen, Haomin Wang, Xiaoming Xie, Alex Frenzel, Zhiyuan Sun |
| المصدر: | Nature communications, vol 10, iss 1 Nature Communications, Vol 10, Iss 1, Pp 1-6 (2019) Nature Communications |
| بيانات النشر: | eScholarship, University of California, 2019. |
| سنة النشر: | 2019 |
| مصطلحات موضوعية: | Materials science, Infrared, Phonon, Science, Superlattice, Stacking, Polaritons, General Physics and Astronomy, 02 engineering and technology, Two-dimensional materials, 01 natural sciences, Article, General Biochemistry, Genetics and Molecular Biology, Condensed Matter::Materials Science, 0103 physical sciences, Microscopy, MD Multidisciplinary, Polariton, lcsh:Science, 010306 general physics, Spectroscopy, Nonlinear Sciences::Pattern Formation and Solitons, Multidisciplinary, Condensed matter physics, General Chemistry, 021001 nanoscience & nanotechnology, lcsh:Q, Soliton, 0210 nano-technology |
| الوصف: | Properties of atomic van der Waals heterostructures are profoundly influenced by interlayer coupling, which critically depends on stacking of the proximal layers. Rotational misalignment or lattice mismatch of the layers gives rise to a periodic modulation of the stacking, the moiré superlattice. Provided the superlattice period extends over many unit cells, the coupled layers undergo lattice relaxation, leading to the concentration of strain at line defects – solitons - separating large area commensurate domains. We visualize such long-range periodic superstructures in thin crystals of hexagonal boron nitride using atomic-force microscopy and nano-infrared spectroscopy. The solitons form sub-surface hexagonal networks with periods of a few hundred nanometers. We analyze the topography and infrared contrast of these networks to obtain spatial distribution of local strain and its effect on the infrared-active phonons of hBN. Solitons may develop when strain forms at line defects separating commensurate domains in misaligned or lattice-mismatched van der Waals heterostructures. Here, the authors use atomic-force microscopy and nano-infrared spectroscopy to image solitons in thin hBN crystals in the form of long-range periodic superstructures, creating sub-surface hexagonal networks with periods of a few hundred nanometers. |
| وصف الملف: | application/pdf |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::fb778f69df60fbc204bf95ee5ae18d5d https://escholarship.org/uc/item/3dm632rz |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.doi.dedup.....fb778f69df60fbc204bf95ee5ae18d5d |
| قاعدة البيانات: | OpenAIRE |
| الوصف غير متاح. |