Creating moiré patterns and chirality in 2D systems
The text discusses the crafting of moiré patterns and chirality in two-dimensional materials, which offer opportunities to manipulate their properties but face challenges in synthesis and structural control. Two-dimensional materials are composed of single or a few atomic layers, and misalignment between these layers can modify their interactions, allowing for manipulation of their structure and functions. Misalignment often arises from lattice constant mismatches between layers, leading to the exploration of diverse 2D heterostructures and the field of twistronics, which studies exotic electronic states in twisted 2D materials forming moiré patterns. Moreover, structural chirality, characterized by the absence of mirror symmetry in atomic lattices, can be achieved in 2D materials, enabling unique optical, electrical, and magnetic properties.
However, synthesizing these intricate structures with precise control faces challenges due to many configurations being thermodynamically unfavorable. The text presents research articles, News & Views pieces, and a Perspective on the growth and characterization of twisted structures, moiré patterns, and chirality in 2D layered materials. An Article by Zhu-Jun Wang and colleagues introduces a process for forming twisted graphene stacks through spiral growth, allowing control of the twist angle by manipulating the orientation of initial wrinkles. Another Article by Matthieu Fortin-Deschênes and colleagues reports on the growth of aligned transition metal dichalcogenide heterostructures with a continuously tuned moiré period, achieved by adjusting chalcogen ratios in constituent layers. This method offers advantages for large-scale manufacturing and moiré design.
Furthermore, moiré superlattices provide a platform for studying correlated and topological physics, with a focus on local atomic stacking and symmetry. An Article by Isaac Craig and colleagues reveals spontaneous structural reconstruction in twisted trilayer graphene using advanced microscopy techniques, aiding in understanding strongly correlated physics in twisted 2D systems. Additionally, studies on broken symmetries in mirror-symmetric twisted trilayer graphene and momentum-polarized states are discussed by Naiyan James Zhang and colleagues. Beyond moiré patterns, the text also explores structural chirality in 2D materials, discussing approaches such as adsorption of chiral molecules, rolling-up of 2D sheets into tubes, and geometrical rotations of lattices.
An Article by Qinwei An and colleagues reports on the growth of transition metal dichalcogenide nanotubes with single chiral angles using gold nanoparticles, showcasing controlled chirality in these materials. This growth method could inspire further research on functional nanotubes beyond carbon nanotubes. Overall, the fascination with 2D materials lies in their vast parameter space for stacking and misalignment, offering freedom to manipulate atomic structures and electronic properties. However, precise structural control and characterization are crucial for exploring the physics and applications of these materials fully.
(Source: https://www.nature.com/articles/s41563-024-01839-7)
However, synthesizing these intricate structures with precise control faces challenges due to many configurations being thermodynamically unfavorable. The text presents research articles, News & Views pieces, and a Perspective on the growth and characterization of twisted structures, moiré patterns, and chirality in 2D layered materials. An Article by Zhu-Jun Wang and colleagues introduces a process for forming twisted graphene stacks through spiral growth, allowing control of the twist angle by manipulating the orientation of initial wrinkles. Another Article by Matthieu Fortin-Deschênes and colleagues reports on the growth of aligned transition metal dichalcogenide heterostructures with a continuously tuned moiré period, achieved by adjusting chalcogen ratios in constituent layers. This method offers advantages for large-scale manufacturing and moiré design.
Furthermore, moiré superlattices provide a platform for studying correlated and topological physics, with a focus on local atomic stacking and symmetry. An Article by Isaac Craig and colleagues reveals spontaneous structural reconstruction in twisted trilayer graphene using advanced microscopy techniques, aiding in understanding strongly correlated physics in twisted 2D systems. Additionally, studies on broken symmetries in mirror-symmetric twisted trilayer graphene and momentum-polarized states are discussed by Naiyan James Zhang and colleagues. Beyond moiré patterns, the text also explores structural chirality in 2D materials, discussing approaches such as adsorption of chiral molecules, rolling-up of 2D sheets into tubes, and geometrical rotations of lattices.
An Article by Qinwei An and colleagues reports on the growth of transition metal dichalcogenide nanotubes with single chiral angles using gold nanoparticles, showcasing controlled chirality in these materials. This growth method could inspire further research on functional nanotubes beyond carbon nanotubes. Overall, the fascination with 2D materials lies in their vast parameter space for stacking and misalignment, offering freedom to manipulate atomic structures and electronic properties. However, precise structural control and characterization are crucial for exploring the physics and applications of these materials fully.
(Source: https://www.nature.com/articles/s41563-024-01839-7)
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