Harmonic generation in transition metal dichalcogenides and their heterostructures

Ma, Rui; Sutherland, Duncan S.; Shi, Yumeng

doi:10.1016/j.mattod.2021.07.023

Cited by 22 publications

(15 citation statements)

References 184 publications

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“…It appeared that polarization enhancement with two petals along staggered stacking direction in 3R MoS 2 (Shi et al, 2017). The 3R-like TMDs few layers and spiral structures also show high degree of SHG polarization at room temperature due to the inversion symmetry breaking (Ma et al, 2021). Furthermore, bilayer or multilayer TMDs materials with different twisted angles always exhibit a different interlayer coupling to tune the properties of TMDs (Wang et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

PVD growth of spiral pyramid-shaped WS2 on SiO2/Si driven by screw dislocations

et al. 2023

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Atomically thin layered transition metal dichalcogenides (TMDs), such as MoS2 and WS2, have been getting much attention recently due to their interesting electronic and optoelectronic properties. Especially, spiral TMDs provide a variety of candidates for examining the light-matter interaction resulting from the broken inversion symmetry, as well as the potential new utilization in functional optoelectronic, electromagnetic and nanoelectronics devices. To realize their potential device applications, it is desirable to achieve controlled growth of these layered nanomaterials with a tunable stacking. Here, we demonstrate the Physical Vapor Deposition (PVD) growth of spiral pyramid-shaped WS2 with ∼200 μm in size and the interesting optical properties via AFM and Raman spectroscopy. By controlling the precursors concentration and changing the initial nucleation rates in PVD growth, WS2 in different nanoarchitectures can be obtained. We discuss the growth mechanism for these spiral-patterned WS2 nanostructures based on the screw dislocations. This study provides a simple, scalable approach of screw dislocation-driven (SDD) growth of distinct TMD nanostructures with varying morphologies, and stacking.

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Section: Introductionmentioning

confidence: 99%

PVD growth of spiral pyramid-shaped WS2 on SiO2/Si driven by screw dislocations

et al. 2023

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“…Although the second-order nonlinear response of TMD monolayers (MX 2 , space group P m 2 (#187); point group D 3 h ) have been studied experimentally and theoretically, − there has been little research into the nonlinear response for Janus TMD monolayers. See, for example, an experimental study on the second-order nonlinear optical properties of monolayer MoSSe, as well as first-principles calculations for MoSSe , and other Janus TMDs .…”

Section: Introductionmentioning

confidence: 99%

Angular Dependence of the Second-Order Nonlinear Optical Response in Janus Transition Metal Dichalcogenide Monolayers

Pike

Pachter

2022

J. Phys. Chem. C

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With advances in the growth of Janus transition metal dichalcogenide (TMD) monolayers and potential applications for materials with a permanent dipole moment, we investigate the electronic, linear, and second-order nonlinear optical properties of Janus TMDs using first-principles calculations. We compare our results to available experimental measurements, finding relatively good agreement. We find the appearance of Rashba spin splitting and the mixing of the second-order nonlinear susceptibility components in Janus TMD monolayers contrary to their TMD monolayer counterparts. While the Rashba effect is small, it does modify the electronic band structure near Γ, making Janus TMDs potentially useful for spintronic applications. In analyzing the mixing of the nonlinear optical susceptibility components, which depend on the angular orientation of the experimental setup and the frequency of the measurement, we find enhancement of the effective nonlinear susceptibility. Our elucidation of the susceptibility components of Janus TMD monolayers as dependent on the angular orientation in an experimental setup provides an understanding and interpretation of the second-order nonlinear response.

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“…74 After discovering graphene in 2004, 83 much effort has been made to uncover the nonlinear physics in other 2D materials beyond graphene. 70,71,73,84 The enormous nonlinear coefficients of these atomically thin materials may allow them to replace conventional nonlinear media in photonic systems. A comparison of different materials in producing OHG is provided in Table 2.…”

Section: Optical Harmonic Generation In CD 3 Asmentioning

confidence: 99%

Recent advances in photonics of three-dimensional Dirac semimetal Cd3As2

et al. 2022

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Due to their unusual features in condensed matter physics and their applicability in optical and optoelectronic applications, three-dimensional Dirac semimetals (3D DSMs) have garnered substantial interest in recent years. In contrast to monolayer graphene, 3D DSM exhibits linear band dispersion despite its macroscopic thickness. Therefore, being a bulk material, it is easy to make nanostructures with 3D DSM, just as one normally does with metals such as gold and silver. Among 3D DSMs, cadmium arsenide (Cd 3 As 2 ) is quite famous and considered an excellent 3D DSM due to its chemical stability in air and extraordinary optical response. In this review, advances in 3D DSM Cd 3 As 2 fabrication techniques and recent progress in the photonics of 3D DSM Cd 3 As 2 are given and briefly reviewed. Various photonic features, including linear and nonlinear plasmonics, optical absorption, optical harmonic generation, and ultrafast dynamics, have been explored in detail. It is expected that Cd 3 As 2 would share an excellent tunable photonic response like graphene. We envision that this article may serve as a concise overview of the recent progress of photonics in 3D DSM Cd 3 As 2 and provides a compact reference for young researchers.

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Harmonic generation in transition metal dichalcogenides and their heterostructures

Cited by 22 publications

References 184 publications

PVD growth of spiral pyramid-shaped WS2 on SiO2/Si driven by screw dislocations

PVD growth of spiral pyramid-shaped WS2 on SiO2/Si driven by screw dislocations

Angular Dependence of the Second-Order Nonlinear Optical Response in Janus Transition Metal Dichalcogenide Monolayers

Recent advances in photonics of three-dimensional Dirac semimetal Cd3As2

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