Tuning commensurability in twisted van der Waals bilayers

Tuning commensurability in twisted van der Waals bilayers

2024-01-18 | Li, Yanxing; Zhang, Fan; Ha, Viet-Anh; et al.
The paper "Tuning commensurability in twisted van der Waals bilayers" by Li et al. explores the electronic properties of twisted van der Waals (vdW) bilayers at large twist angles, which are not typically investigated. The authors use WSe2 bilayers to create incommensurate dodecagon quasicrystals at a twist angle of 30° and commensurate moiré crystals at 21.8° or 38.2°. Valley-resolved scanning tunneling spectroscopy (STS) reveals distinct behaviors between these two types of moiré structures. The quasicrystal exhibits rich electronic structures, including mini gaps near the valence band maximum, while the commensurate moiré crystal shows coherent interlayer transport and excitons. The study highlights the potential of large-angle twisted bilayers as a new platform for exploring moiré physics, particularly in the context of strong interlayer coupling and spin-orbit coupling. The findings provide insights into the electronic and transport properties of these materials, which could have applications in quantum computing and other advanced technologies.The paper "Tuning commensurability in twisted van der Waals bilayers" by Li et al. explores the electronic properties of twisted van der Waals (vdW) bilayers at large twist angles, which are not typically investigated. The authors use WSe2 bilayers to create incommensurate dodecagon quasicrystals at a twist angle of 30° and commensurate moiré crystals at 21.8° or 38.2°. Valley-resolved scanning tunneling spectroscopy (STS) reveals distinct behaviors between these two types of moiré structures. The quasicrystal exhibits rich electronic structures, including mini gaps near the valence band maximum, while the commensurate moiré crystal shows coherent interlayer transport and excitons. The study highlights the potential of large-angle twisted bilayers as a new platform for exploring moiré physics, particularly in the context of strong interlayer coupling and spin-orbit coupling. The findings provide insights into the electronic and transport properties of these materials, which could have applications in quantum computing and other advanced technologies.
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[slides and audio] Tuning commensurability in twisted van der Waals bilayers.