What Influences Long-Wavelength Moiré Superlattice Morphology? NanoLetters moire 2DMaterials nanoscience nanomaterials quantum nanotechnology
By Bhavna KavetiJul 22 2022Reviewed by Megan Craig, M.Sc. Moiré superlattices are lattice interference effects that make the crystal lattice highly sensitive to intrinsic atomic reconstructions and extrinsic mechanical perturbations. In an article published in the journal Nano Letters, researchers used scanning tunneling spectroscopy and scanning tunneling microscopy to observe the long-wavelength tungsten sulfide superlattice structure.
Comapred to the interlayer hybridization-induced electronic modulation at the valence band edge, the localized intralayer strain induced a strong K point modulation of the conduction band that reached up to 300 millielectronvolts in heavily deformed moiré superlattices. The STM observations provided information on the transition metal dichalcogenides moiré superlattices.
Related StoriesLayered TMDs with moiré superlattices paved a new path to explore novel electronic and excitonic quantum phenomena that arise from the unusual arrangement in moiré superlattices which consequently introduced a wide range of electronic band-edge states. The moiré superlattices emerge from the crystal interface’s interference effect, where its geometry deforms severely on subjecting to atomic scale perturbations.
Here, the intrinsic lattice reconstruction and extrinsic heterostrain significantly contributed to the evolution in morphology in long-wavelength WS2 moiré superlattices. Moreover, the distinguished interchange between the intrinsic and extrinsic factors introduced a strong and localized strain among the layers in the crystal lattice.
Moreover, in heavily deformed moiré superlattices, the K-point energy position reached 300 millielectronvolts. While the valence band edge modulation with interlayer origin relied on the interlayer hybridization, the conduction band modulation with intralayer origin depended on intralayer atomic orbital overlaps.
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