Publisher Correction: Phonon renormalization in reconstructed MoS2 moiré superlattices

Quan, Jiamin; Linhart, Lukas; Lin, Miao‐Ling; Lee, Dae Hun; Zhu, Jihang; Wang, Chun-Yuan; Hsu, Wei-Ting; Choi, Junho; Embley, Jacob; Young, Carter; Taniguchi, Takashi; Watanabe, Kenji; Shih, Chih‐Kang; Lai, Keji; MacDonald, Allan H.; Tan, Ping‐Heng; Libisch, Florian; Li, Xiaoqin

doi:10.1038/s41563-021-00998-1

Cited by 3 publications

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“…It is worth noting that the twisted stacking between different vdWH constituents may lead to the formation of moireṕ atterns depending on twist angle φ, which will modify interlayer LB coupling. 19 According to previous report on MoS 2 /graphene vdWHs, φ has little influence on LB modes, because the mismatch of the in-plane lattice constant between MoS 2 and graphene is too large to form moirépatterns. 22 However, the in-plane lattice constant between hBN and graphene is only about ∼1.8%, 31 thus the influence of moireṕ atterns formed at the hBN/graphene interface is not negligible.…”

Section: Resultsmentioning

confidence: 99%

“…To simplify the analysis in this work, we identified the crystal orientation of the adjacent hBN and graphene layers using the crystalline edges (Figure S1), and intentionally controlled φ to be larger than 7°to minimize the LB coupling modification from moirépatterns. 19 Low-frequency Raman signatures of tBLG/hBN and hBN/tBLG vdWHs with φ < 7°w ill be discussed elsewhere.…”

Section: Resultsmentioning

confidence: 99%

“…However, the in-plane lattice constant between hBN and graphene is only about ∼1.8%, thus the influence of moiré patterns formed at the hBN/graphene interface is not negligible. To simplify the analysis in this work, we identified the crystal orientation of the adjacent hBN and graphene layers using the crystalline edges (Figure S1), and intentionally controlled φ to be larger than 7° to minimize the LB coupling modification from moiré patterns . Low-frequency Raman signatures of tBLG/hBN and hBN/tBLG vdWHs with φ < 7° will be discussed elsewhere.…”

Section: Results and Discussionmentioning

confidence: 99%

“…This mismatch of spatial distributions of electron and phonon may provide an additional degree of freedom to manipulate EPC to achieve quantum effects as demonstrated by 2DM/tTLG in this work. Finally, using tBLG to study moiré-related physics based on graphene/hBN superlattices formed at small φ (the twist angle of graphene/hBN interface) is also an uninvestigated but promising direction to explore, where phonon renormalization may be observed. Considering all of these advantages and opportunities, we believe that twisted graphene layers constitute a promising substrate in future studies to unveil useful information at the vdW interface and manipulate unconventional particle-quasiparticle interactions in 2D heterostructures.…”

Section: Discussionmentioning

confidence: 99%

“…Interlayer phonons involve the relative motion between the adjacent atomic planes, and are natural indicators of interlayer interaction. − According to the vibration direction, interlayer phonons can be divided into interlayer shear and layer-breathing (LB) modes (i.e., the rigid-layer out-of-plane vibration mode, which can also be called the compression mode , ). For graphene-based vdWHs consisting of constituents with strong coupling strength between interlayer phonons and specific excited electrons or excitons, interlayer phonons of the vdWHs can be conveniently probed by resonance Raman spectroscopy, − which makes it possible to study the interlayer interaction.…”

Section: Introductionmentioning

confidence: 99%

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Enhanced Layer-Breathing Modes in van der Waals Heterostructures Based on Twisted Bilayer Graphene

Lin

et al. 2023

ACS Nano

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The characterization of interlayer coupling in two-dimensional van der Waals heterostructures (vdWHs) is essential to understand their quantum behaviors and structural functionalities. Interlayer shear and layer-breathing (LB) phonons carry rich information on interlayer interaction, but they are usually too weak to be detected via standard Raman spectroscopy due to the weak electron–phonon coupling (EPC). Here, we report a universal strategy to enhance LB modes of vdWHs based on twisted bilayer graphene (tBLG). In both tBLG/hBN and tBLG/MoS2 vdWHs, the resonantly excited electrons in tBLG can strongly couple to LB phonons extended over the entire layers in the vdWHs, whose resonance condition is tunable by the twist angle of tBLG. In vdWHs containing twisted graphene layers with multiple twisted interfaces, the EPC of LB phonons coming from the collective LB vibrations of entire heterostructure layers can be tuned by resonant excitation of programmable van Hove singularities according to each twisted interface. The universality and tunability of enhanced LB phonons by tBLG make it a promising method to investigate EPC and interlayer interaction in related vdWHs.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Results and Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Enhanced Layer-Breathing Modes in van der Waals Heterostructures Based on Twisted Bilayer Graphene

Lin

et al. 2023

ACS Nano

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Nonlinear Optical Response Modulated by Lattice Reconstruction in Small‐Angle Twisted Bilayer MoS₂

Xu,

Mao,

et al. 2023

Advanced Optical Materials

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Subtle perturbations in interlayer twist angles offer a novel investigational avenue for revealing intriguing optical characteristics within the domain of 2D materials. In this study, a homogeneous bilayer structure featuring precisely defined interlayer twist angles is meticulously engineered by stacking monolayer single‐crystal MoS2 in a controlled, layer‐by‐layer manner. Scanning tunneling microscopy (STM) reveals an unexpected lattice reconstruction, particularly at twist angles of ≤ 2°, which induces the emergence of expansive rhombohedral‐stacked large triangular domains. Furthermore, a second‐harmonic generation (SHG) is utilized as a sensitive modality to demonstrate profound transformations in the local electron band structures. By combining the linear spectra with SHG, the change in the C‐exciton optical response in the band‐nesting region of the small‐angle twisted bilayer MoS2 before and after crossing a critical twist angle of 2° is discussed. The study shows that SHG can be used as a nondestructive method to characterize the lattice structure of small‐angle twisted bilayer samples. Furthermore, determining the potential relationship between the lattice reconstruction and the linear and nonlinear spectra further demonstrates the regulatory effect of the interlayer twist angle on the nonlinear optical effects of 2D materials.

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Interlayer Phonon Coupling from Heavy and Light Sublayers in a Natural Van der Waals Superlattice

Bai,

Hua,

Nan

et al. 2023

J. Am. Chem. Soc.

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Layered compounds characterized by van der Waals gaps are often associated with relatively weak interlayer particle interactions. However, in specific scenarios, these seemingly feeble forces can exert an impact on interlayer interactions through subtle energy fluctuations, which can give rise to a diverse range of physical and chemical properties, particularly intriguing in the context of thermal transport. In this study, taking a natural superlattice composed of alternately stacked PbS and SnS 2 sublayers as a model, we proposed that in a superlattice, there is strong hybridization between acoustic phonons of heavy sublayers and optical phonons of light sublayers. We identified newly generated vibration modes in the superlattice, such as interlayer shear and breathing, which exhibit lower sound velocity and contribute less to heat transport compared to their parent materials, which significantly alters the thermal behaviors of the superlattice compared to its bulk counterparts. Our findings on the behavior of interlayer phonons in superlattices not only can shed light on developing functional materials with enhanced thermal dissipation capabilities but also contribute to the broader field of condensed matter physics, offering insights into various fields, including thermoelectrics and phononic devices, and may pave the way for technological advancements in these areas.

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Publisher Correction: Phonon renormalization in reconstructed MoS2 moiré superlattices

Cited by 3 publications

References 0 publications

Enhanced Layer-Breathing Modes in van der Waals Heterostructures Based on Twisted Bilayer Graphene

Enhanced Layer-Breathing Modes in van der Waals Heterostructures Based on Twisted Bilayer Graphene

Nonlinear Optical Response Modulated by Lattice Reconstruction in Small‐Angle Twisted Bilayer MoS₂

Interlayer Phonon Coupling from Heavy and Light Sublayers in a Natural Van der Waals Superlattice

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Publisher Correction: Phonon renormalization in reconstructed MoS2 moiré superlattices

Cited by 3 publications

References 0 publications

Enhanced Layer-Breathing Modes in van der Waals Heterostructures Based on Twisted Bilayer Graphene

Enhanced Layer-Breathing Modes in van der Waals Heterostructures Based on Twisted Bilayer Graphene

Nonlinear Optical Response Modulated by Lattice Reconstruction in Small‐Angle Twisted Bilayer MoS2

Interlayer Phonon Coupling from Heavy and Light Sublayers in a Natural Van der Waals Superlattice

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Nonlinear Optical Response Modulated by Lattice Reconstruction in Small‐Angle Twisted Bilayer MoS₂