Moiré Patterns in 2D Materials: A Review

He, Feng; Zhou, Yongjian; Ye, Zefang; Cho, Sang-Hyeok; Jeong, Jihoon; Meng, Xianghai

doi:10.1021/acsnano.0c10435

Cited by 170 publications

(104 citation statements)

References 144 publications

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“…The simplistic approach of producing vertical vdW heterostructures without the constraints of crystal lattice mismatch enables integrating various 2D materials to create diverse systems with new electronic properties that are not present in pristine components. In addition to the selection of compounds in terms of their properties, a new degree of freedom has emerged: the twist angle between stacked layers, which gives rise to the group of the so-called twistronic materials 14 , 15 . The twist angle is responsible for the occurrence of moiré patterns, that leads to new and intriguing phenomena, like the formation of secondary Dirac points in graphene on hexagonal boron nitride (hBN) 16 , 17 or hybridized (moiré) excitons in vdW heterostructures formed by stacked two S-TMD MLs 18 – 23 .…”

Section: Introductionmentioning

confidence: 99%

The optical response of artificially twisted MoS$$_2$$ bilayers

Grzeszczyk

Szpakowski

Slobodeniuk

et al. 2021

Sci Rep

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Two-dimensional layered materials offer the possibility to create artificial vertically stacked structures possessing an additional degree of freedom—theinterlayertwist. We present a comprehensive optical study of artificially stacked bilayers (BLs) MoS$$_2$$ 2 encapsulated in hexagonal BN with interlayer twist angle ranging from 0$$^{\circ }$$ ∘ to 60$$^{\circ }$$ ∘ using Raman scattering and photoluminescence spectroscopies. It is found that the strength of the interlayer coupling in the studied BLs can be estimated using the energy dependence of indirect emission versus the A$$_\text {1g}$$ 1g –E$$_\text {2g}^1$$ 2g 1 energy separation. Due to the hybridization of electronic states in the valence band, the emission line related to the interlayer exciton is apparent in both the natural (2H) and artificial (62$$^\circ $$ ∘ ) MoS$$_2$$ 2 BLs, while it is absent in the structures with other twist angles. The interlayer coupling energy is estimated to be of about 50 meV. The effect of temperature on energies and intensities of the direct and indirect emission lines in MoS$$_2$$ 2 BLs is also quantified.

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Section: Introductionmentioning

confidence: 99%

The optical response of artificially twisted MoS$$_2$$ bilayers

Grzeszczyk

Szpakowski

Slobodeniuk

et al. 2021

Sci Rep

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“…[115,116] Moiré patterns are observed due to the enhanced electron orbitals coupling in the adjacent 2D materials. [117,118] So far, 2D heterostructure have been used in optoelectronic applications including LEDs, photodetectors, photovoltaic devices, and so on. [109,119,120] Notably, vdW heterostructures have atomically thin charge transport path, which can be used to realize ultrafast switching speed in optoelectronic devices.…”

Section: Synthesis and Optoelectronic Properties Of 2d Materials And ...mentioning

confidence: 99%

Perspectives of 2D Materials for Optoelectronic Integration

Zhao

Zhang

et al. 2021

Adv Funct Materials

122

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2D materials show wide-ranging physical properties with their electronic bandgaps varying from zero to several electronvolts, offering a rich platform to explore novel electronic and optoelectronic functions. Notably, atomically thin 2D materials are well suited for integration in optoelectronic circuits, because of their ultrathin body, strong light-matter interactions, and compatibility with the current silicon photonic technology. In this paper, an overview of the state of the art of using 2D materials in optoelectronic devices and integration is provided. The optoelectronic properties of 2D materials and their typical electronic and optoelectronic applications including light sources, optical modulators, photodetectors, field-effect transistors, and logic circuits are summarized. The device configurations, operation mechanisms, and device figures-of-merit are introduced and discussed. By discussing the recent advances, future trends, and existing challenges of 2D materials and their optoelectronic devices, this review has provided an insight into the perspectives of 2D materials for optoelectronic integration and may guide the development of this field within the research community.

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“…After obtaining 2D materials, nonlinear optical techniques can be applied to identify the crystallographic orientation in 2D crystals successfully, such as second harmonic generation (SHG) and polarized Raman. [ 113–116 ] As for SHG technique, SHG signals cannot be directly identified such as graphene and isotropic 2D crystals including most TMDs. Recently, Cui et al developed a chemical method to realize the visualization of crystallographic orientation with an optical microscope.…”

Section: Manipulating Dofs Of Vdw Heterostructuresmentioning

confidence: 99%

Steering on Degrees of Freedom of 2D Van der Waals Heterostructures

Zhang

Lin

et al. 2021

Small Science

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2D heterostructures have garnered tremendous attention for potential applications in electronics and optoelectronics. Heterostructures can be constructed by assembling individual atomically thin layers of 2D materials into integrated devices, which involves three primary degrees of freedom (DOFs), i.e., Lego‐like basic building blocks, out‐of‐plane stacking order, and in‐plane twist‐angle alignment. By steering the DOFs of 2D materials, devices and structures such as artificial Shockley junction, quantum wells, and superlattices can be conveniently established based on well‐developed fabrication and/or assembly techniques, beneficial for next‐generation ultracompact information technologies. Herein, the recent progress on constructing the artificial atomic structures by taking advantage of three primary DOFs is overviewed. An outlook of the challenges and future developments is presented as well. Future advancements in the rational construction of complex devices and artificial heterostructures are also suggested.

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Moiré Patterns in 2D Materials: A Review

Cited by 170 publications

References 144 publications

The optical response of artificially twisted MoS$$_2$$ bilayers

The optical response of artificially twisted MoS$$_2$$ bilayers

Perspectives of 2D Materials for Optoelectronic Integration

Steering on Degrees of Freedom of 2D Van der Waals Heterostructures

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