首页|Moiré superlattices arising from growth induced by screw dislocations in layered materials
Moiré superlattices arising from growth induced by screw dislocations in layered materials
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Moiré superlattices(MSLs)are modulated structures produced from homogeneous or heterogeneous two-dimensional layers stacked with a twist angle and/or lattice mismatch.Enriching the methods for fabricating MSL and realizing the unique emergent properties are key challenges in its investigation.Here we recommend that the spiral dislocation driven growth is another optional method for the preparation of high quality MSL samples.The spiral structure stabilizes the constant out-of-plane lattice distance,causing the variations in electronic and optical properties.Taking SnS2 MSL as an example,we find prominent properties including large band gap reduction(～0.4 eV)and enhanced optical activity.First-principles calculations reveal that these unusual properties can be ascribed to the locally enhanced interlayer interaction associated with the Moiré potential modulation.We believe that the spiral dislocation driven growth would be a powerful method to expand the MSL family and broaden their scope of application.
State Key Laboratory of Integrated Optoelectronics Key Laboratory of Automobile Materials of MOE and College of Materials Science and Engineering,Jilin University,Changchun 130012,China
Suzhou Laboratory,Suzhou 215123,China
National Key Research and Development Program of ChinaNational Natural Science Foundation of China
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