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Nanoscale lattice dynamics in hexagonal boron nitride moiré superlattices
- Source :
- Nature Communications, Nature Communications, Vol 12, Iss 1, Pp 1-7 (2021)
- Publication Year :
- 2021
- Publisher :
- Springer Science and Business Media LLC, 2021.
-
Abstract
- Twisted two-dimensional van der Waals (vdW) heterostructures have unlocked a new means for manipulating the properties of quantum materials. The resulting mesoscopic moiré superlattices are accessible to a wide variety of scanning probes. To date, spatially-resolved techniques have prioritized electronic structure visualization, with lattice response experiments only in their infancy. Here, we therefore investigate lattice dynamics in twisted layers of hexagonal boron nitride (hBN), formed by a minute twist angle between two hBN monolayers assembled on a graphite substrate. Nano-infrared (nano-IR) spectroscopy reveals systematic variations of the in-plane optical phonon frequencies amongst the triangular domains and domain walls in the hBN moiré superlattices. Our first-principles calculations unveil a local and stacking-dependent interaction with the underlying graphite, prompting symmetry-breaking between the otherwise identical neighboring moiré domains of twisted hBN.<br />Here, the authors investigate the lattice dynamics of twisted hexagonal boron nitride layers via nano-infrared spectroscopy, showing local and stacking-dependent variations of the optical phonon frequencies associated to the interaction with the graphite substrate.
- Subjects :
- Materials science
Phonon
Science
Superlattice
Physics::Optics
General Physics and Astronomy
Electronic structure
Two-dimensional materials
Article
General Biochemistry, Genetics and Molecular Biology
Condensed Matter::Materials Science
symbols.namesake
Surfaces, interfaces and thin films
Condensed Matter::Superconductivity
Physics::Atomic and Molecular Clusters
Graphite
Spectroscopy
Mesoscopic physics
Multidisciplinary
Condensed matter physics
Heterojunction
General Chemistry
Computer Science::Other
symbols
van der Waals force
Subjects
Details
- ISSN :
- 20411723
- Volume :
- 12
- Database :
- OpenAIRE
- Journal :
- Nature Communications
- Accession number :
- edsair.doi.dedup.....e78e6b464d3d156407f2f6135b7b6bd5