Journal
PHYSICAL REVIEW B
Volume 91, Issue 16, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.91.165403
Keywords
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Funding
- Donors of the American Chemical Society Petroleum Research Fund [53401-UNI10]
- National Science Foundation [DMR-1206530, DMR-1410496]
- University of Northern Iowa (UNI) Faculty Summer Fellowship
- UNI Physics Department International Student Fund
- Ministry of Science and Technology of the Republic of China [103-2112-M-007-001-MY3]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1206530] Funding Source: National Science Foundation
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We have investigated the vibrational properties of van derWaals heterostructures of monolayer transition metal dichalcogenides (TMDs), specifically MoS2/WSe2 and MoSe2/MoS2 heterobilayers and twisted MoS2 bilayers, by means of ultralow-frequency Raman spectroscopy. We discovered Raman features (at 30-40 cm(-1)) that arise from the layer-breathing mode (LBM) vibration between the two incommensurate TMD monolayers in these structures. The LBM Raman intensity correlates strongly with the suppression of photoluminescence that arises from interlayer charge transfer. The LBM is generated only in bilayer areas with direct layer-layer contact and an atomically clean interface. Its frequency also evolves systematically with the relative orientation between the two layers. Our research demonstrates that the LBM can serve as a sensitive probe to the interface environment and interlayer interactions in van der Waals materials.
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