Flatbands and Mechanical Deformation Effects in the Moir\'e Superlattice of MoS$_2$-WSe$_2$ Heterobilayers
| العنوان: | Flatbands and Mechanical Deformation Effects in the Moir\'e Superlattice of MoS$_2$-WSe$_2$ Heterobilayers |
|---|---|
| المؤلفون: | Joshua A. Robinson, Felix Lüpke, Yu-Chuan Lin, Chong Wang, Bhakti Jariwala, Di Xiao, Yifan Nie, Yi Pan, Hongyan Lv, Kehao Zhang, Randall M. Feenstra, Stefan Fölsch, Kyeongjae Cho, Dacen Waters |
| سنة النشر: | 2020 |
| مصطلحات موضوعية: | Van der waals heterostructures, Condensed Matter - Materials Science, Materials science, Condensed matter physics, Condensed Matter - Mesoscale and Nanoscale Physics, Superlattice, General Engineering, General Physics and Astronomy, 02 engineering and technology, Moiré pattern, Deformation (meteorology), 010402 general chemistry, 021001 nanoscience & nanotechnology, Epitaxy, 01 natural sciences, 0104 chemical sciences, law.invention, symbols.namesake, law, symbols, General Materials Science, Density functional theory, van der Waals force, Scanning tunneling microscope, 0210 nano-technology |
| الوصف: | It has recently been shown that quantum-confined states can appear in epitaxially grown van der Waals material heterobilayers without a rotational misalignment ($\theta=0^\circ$), associated with flat bands in the Brillouin zone of the moir\'e pattern formed due to the lattice mismatch of the two layers. Peaks in the local density of states and confinement in a MoS$_2$/WSe$_2$ system was qualitatively described only considering local stacking arrangements, which cause band edge energies to vary spatially. In this work, we report the presence of large in-plane strain variation across the moir\'e unit cell of a $\theta=0^\circ$ MoS$_2$/WSe$_2$ heterobilayer, and show that inclusion of strain variation and out-of-plane displacement in density functional theory calculations greatly improves their agreement with the experimental data. We further explore the role of twist-angle by showing experimental data for a twisted MoS$_2$/WSe$_2$ heterobilayer structure with twist angle of $\theta=15^\circ$, that exhibits a moir\'e pattern but no confinement. Comment: 13 pages, 6 figures in main text. Supporting information included with 13 pages, 8 figures, and 2 tables |
| اللغة: | English |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::647252b7ef9a69d70a5ce53edcf99f7f http://arxiv.org/abs/2004.07851 |
| Rights: | OPEN |
| رقم الانضمام: | edsair.doi.dedup.....647252b7ef9a69d70a5ce53edcf99f7f |
| قاعدة البيانات: | OpenAIRE |
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