Strong optical nonlinearity of CVD-grown<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>MoS</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math>monolayer as probed by wavelength-dependent second-harmonic generation

Clark, Daniel J.; Senthilkumar, V.; Le, Chinh Tam; Weerawarne, Darshana L.; Shim, Bonggu; Jang, Joon I.; Shim, Jong Hyun; Cho, Junghyun; Sim, Yumin; Seong, M. J.; Rhim, S. H.; Freeman, A. J.; Chung, Koo–Hyun; Kim, Yong Soo

doi:10.1103/physrevb.90.121409

Cited by 110 publications

(61 citation statements)

References 29 publications

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“…Malard et al observed that χ (2) was enhanced for about four times when SHG energy was in resonance with the C exciton of MoS 2 . Since then, both the experiments and calculations indicated that A and B exciton could also enhance SHG . Typically, Wang et al recorded an enhancement up to three order of magnitude at A (1 s ) and B (1 s ) exciton resonance of WSe 2 at 4 K (Figure A) .…”

Section: Modulation and Enhancement Of Nlomentioning

confidence: 96%

“…34 Since then, both the experiments and calculations indicated that A and B exciton could also enhance SHG. 48,57,59,61,65,66,146,147 Typically, Wang et al recorded an enhancement up to three order of magnitude at A (1s) and B (1s) exciton resonance of WSe 2 at 4 K ( Figure 4A). 66 Janisch et al calculated χ (2) of WS 2 in the range of 0.5 to 2.5 eV, and the excitonic-enhanced nonlinear susceptibility was well resolved ( Figure 4B).…”

Section: Excitonic Effect-modulated Nlomentioning

confidence: 96%

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Nonlinear optics of two‐dimensional transition metal dichalcogenides

Wen

Gong

2019

InfoMat

181

156

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Nonlinear optics (NLO) of transition metal dichalcogenides (TMDs) is promising for the on‐chip photonic and optoelectronic applications. In this review, we will survey the current progress of NLO in TMDs. First, we will brief the basic theory of the NLO in TMDs. Second, several important nonlinear processes in TMDs such as harmonic generation, four‐wave mixing, saturable absorption, and two‐photon absorption will be presented and their potential applications are also discussed. Third, the main strategies to tune, modulate, and enhance the NLO in TMDs are reviewed, including the excitonic effect, symmetry modulation, optical cavity enhancement, valley selection, edge state, and material phase. Finally, we give an outlook regarding some important issues and directions of NLO in TMDs.

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Section: Modulation and Enhancement Of Nlomentioning

confidence: 96%

Section: Excitonic Effect-modulated Nlomentioning

confidence: 96%

Nonlinear optics of two‐dimensional transition metal dichalcogenides

Wen

Gong

2019

InfoMat

181

156

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“…At the same time, it is challenging to induce magnetism in such materials. Given such a situation, an alternative approach would be using these materials for passive spintronic applications . Instead of making use of intrinsic magnetic properties of the 2D materials to build devices, one may think of controlling spin polarized current in the 2D channel materials by external means, such as magnetization of electrodes, gating and/or bias voltage.…”

Section: Spin Logic Devicesmentioning

confidence: 99%

Prospects of spintronics based on 2D materials

Feng

Shen

Yang

et al. 2017

WIREs Comput Mol Sci

197

135

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Spintronics holds the promise for future information technologies. Devices based on manipulation of spin are most likely to replace the current silicon complementary metal‐oxide semiconductor devices that are based on manipulation of charge. The challenge is to identify or design materials that can be used to generate, detect, and manipulate spin. Since the successful isolation of graphene and other two‐dimensional (2D) materials, there has been a strong focus on spintronics based on 2D materials due to their attractive properties, and much progress has been made, both theoretically and experimentally. Here, we summarize recent developments in spintronics based on 2D materials. We focus mainly on materials of truly 2D nature, that is, atomic crystal layers such as graphene, phosphorene, monolayer transition metal dichalcogenides, and others, but also highlight current research foci in heterostructures or interfaces. In particular, we emphasize roles played by computation based on first‐principles methods which has contributed significantly in the designs of spintronic materials and devices. We also highlight challenges and suggest possible directions for further studies. WIREs Comput Mol Sci 2017, 7:e1313. doi: 10.1002/wcms.1313 This article is categorized under: Structure and Mechanism > Computational Materials Science Electronic Structure Theory > Ab Initio Electronic Structure Methods Electronic Structure Theory > Density Functional Theory

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“…The infinitesimally thin nature of monolayers has raised debate between previous studies regarding the determination of material nonlinear susceptibilities, resulting in reported values varying by many orders of magnitude and prohibiting comparison with other nonlinear materials [3][4][5]. Here, we treat the problem in the context of surface nonlinear optics following Ref.…”

Section: Second-and Third-harmonic Generation Microscopy Of Monolayermentioning

confidence: 99%

“…1(d)-(e)]. SHG has already been confirmed as a promising technique for imaging MoS 2 and characterizing the second-order nonlinear susceptibility χ (2) [3][4][5]. However, the inversion symmetry of evenlayered MoS 2 flakes limit this technique to MoS 2 flakes with an odd number of layers [6].…”

Section: Second-and Third-harmonic Generation Microscopy Of Monolayermentioning

confidence: 99%