Eshelby-twisted three-dimensional moiré superlattices

Song, Zhigang; Sun, Xiaotian; Wang, Lin‐Wang

doi:10.1103/physrevb.103.245206

Cited by 17 publications

(15 citation statements)

References 48 publications

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“…We then built moiré superlattices by commensurately twisting two nanosheets, as illustrated in Figure b. , We performed self-consistent DFT calculations to fully relax the twisted structures, which contain up to approximately 18000 atoms. The results with a twist angle of 3.47° are shown in Figure c.…”

Section: Resultsmentioning

confidence: 99%

Deep Quantum-Dot Arrays in Moiré Superlattices of Non-van der Waals Materials

et al. 2022

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Recently, moirésuperlattices of twisted van der Waals (vdW) materials have attracted substantial interest due to their strongly correlated properties. However, the vdW interlayer interaction is intrinsically weak, such that many desired properties can only exist at low temperature. Here, we theoretically predict some unusual properties stemming from the chemical bonding between twisted PbS nanosheets as an example of non-vdW moireś uperlattices. The strong interlayer coupling in such systems results in giant strain vortices and dipole vortices at the interface. The modified electronic structures become a series of dispersionless bands and artificial-atom states. In real space, these states are analogous to arrays of well-positioned quantum dots, which may be promising for use in single-electron devices. In theory, if the materials are doped with a low concentration of electrons, a Wigner crystal will form even without any magnetic field. To confirm the accessibility and stability of non-vdW moirésuperlattices in experiment, we synthesized PbS moirésuperlattices with different twist angles. Our transmission-electron-microscope observations reveal the resemblance of the small-angle-twisted structures with the square matrices of quantum dots, which is in good accordance with our calculations.

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Section: Resultsmentioning

confidence: 99%

Deep Quantum-Dot Arrays in Moiré Superlattices of Non-van der Waals Materials

et al. 2022

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“…In the context of 3D twistronics, the potentially exotic properties of such screw-dislocated layered materials with interlayer twist angles, such as superconductivity, various magnetic and ferroelectric orderings, and topological and quantum properties, would be exciting to explore. Some recent theoretical work on continuously twisting multilayered stacks of graphene , and GeTe shows the possibility to introduce magic-angle Weyl fermions, optical circular dichroism, and the chirality-specific nonlinear Hall effect. In addition to the continuous twisting of layered materials, an alternating twist could be another promising direction.…”

Section: Discussionmentioning

confidence: 99%

Stacking and Twisting of Layered Materials Enabled by Screw Dislocations and Non-Euclidean Surfaces

Zhao

Jin

2022

Acc. Mater. Res.

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Metrics & MoreArticle Recommendations CONSPECTUS:The rise of van der Waals layered materials such as graphene, hexagonal boron nitride, and transition-metal dichalcogenides opens up enormous opportunities for exploring novel quantum phenomena at the two-dimensional (2D) atomic limit. The physical properties of van der Waals materials are often affected by the symmetry of the crystal lattices. For example, breaking the inversion symmetry can lead to a variety of phenomena, such as second-harmonic generation, valley polarization, and ferroelectricity. The symmetry and symmetry breaking of layered materials are determined by the atomic arrangements within the layer and the layer stackings. The screw-dislocationdriven growth mechanism is general to 2D materials and can provide effective kinetic pathways to influence the layer stacking and generate diverse and complex layer stackings with different symmetry. Furthermore, different van der Waals layered materials can also be stacked vertically to create artificial new structures. In such stacked structures, the interlayer twist angle between stacked layers results in the formation of large-scale moirésuperlattices that manipulate the electronic structures of van der Waals materials and provide an additional degree of freedom for tuning their physical properties. The stacking and twisting of layered materials lead to observations of new quantum phenomena, such as unconventional superconductivity, tunable Mott insulators, moiréexcitons, and various magnetic and ferroelectric orderings. Previously, such twisted 2D structures were often fabricated by mechanically stacking exfoliated layers, but it was recently demonstrated that twisted van der Waals structures can form via direct growth. Moreover, continuously twisted structures of 2D materials can be realized through two distinct mechanisms that involve screw dislocations. The Eshelby twist mechanism induced by the strain of screw dislocation gives rise to twisted van der Waals nanowires with small interlayer twists. Beyond the Eshelby twist mechanism, supertwisted spirals have recently been enabled by a non-Euclidean twist mechanism which arises from the mismatched geometry between van der Waals crystals and non-Euclidean (curved) surfaces.In this Account, we start with reviewing the stacking configurations in the diverse polytypic structures of layered materials using transition-metal dichalcogenides as examples. We further discuss the twisted structures of layered materials from a structural point of view. After introducing screw-dislocation-driven growth and showing its generality in the crystal growth of layered materials, we further discuss how the unique structures of screw dislocations influence the stacking and symmetry of layered materials. Moreover, we highlight how screw dislocations enable interlayer twisting through the Eshelby twist mechanism and the non-Euclidean twist mechanism. In the end, the challenges and future perspectives are discussed for the study of screw-dislocated layered materials to contro...

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“…f) Comparison of average absorption at different twist angle θ. Reproduced with permission. [ 157 ] Copyright 2021, American Physical Society. g,h) Band structures of isotropic spiral nanowires with Eshelby twist and anisotropic ones with just screw dislocations, respectively.…”

Section: Spiral Nanowiresmentioning

confidence: 99%

Section: Spiral Nanowiresmentioning

confidence: 99%

“…The calculated CD spectra of spiral nanowires with reverse signs of the Burgers vectors show multiple optically active interband transitions (Figure 8d,e). [156,157] There is no need to consider the structural anisotropy of those with Eshelby twist, as the diagonal elements of metrics after twist are not in agreement with before. In other words, the optical activity could be induced in isotropic structures in the presence of Eshelby twist (Figure 8g).…”

Section: Structural Evolution and Mechanismmentioning

confidence: 99%

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Emerging Nonplanar van der Waals Nanoarchitectures from 2D Allotropes for Optoelectronics

Ouyang

Zhang

et al. 2022

Adv Funct Materials

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The unique atomic thickness and mechanical flexibility of 2D van der Waals (vdW) materials endow them with spatial designability and constructability. It is easy to break the inherent planar construction through various spatial manipulations, thus creating vdW nanoarchitectures with nonplanar topologies. The basic properties before evolution are retained and tunable by architecture‐related feature sizes, and other newly generated properties are inspiring as they are beyond the reach of 2D allotropes, bringing great competitiveness for their encouraging applications in optoelectronics. Here, these representative nonplanar vdW nanoarchitectures (i.e., nanoscrolls, nanotubes, spiral nanopyramids, spiral nanowires, nanoshells, etc.) are summarized and their structural evolution processes are elucidated. Their fascinating nascent properties based on their distinctive structural features, focusing on generally enhanced light–matter interactions and device physics, are further introduced. Finally, their opportunities and challenges for in‐depth experimental exploration are prospected. It is a brand‐new idea to modify the properties of 2D vdW materials from micro‐ and nanostructural design and evolution, offering a solid platform for twistronics, valleytronics, and integrated nanophotonics.

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Eshelby-twisted three-dimensional moiré superlattices

Cited by 17 publications

References 48 publications

Deep Quantum-Dot Arrays in Moiré Superlattices of Non-van der Waals Materials

Deep Quantum-Dot Arrays in Moiré Superlattices of Non-van der Waals Materials

Stacking and Twisting of Layered Materials Enabled by Screw Dislocations and Non-Euclidean Surfaces

Emerging Nonplanar van der Waals Nanoarchitectures from 2D Allotropes for Optoelectronics

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