Active Light Control of the MoS<sub>2</sub> Monolayer Exciton Binding Energy

Li, Ziwei; Xiao, Yijun; Gong, Yongji; Wang, Zongpeng; Kang, Yimin; Zu, Shuai; Ajayan, Pulickel M.; Nordlander, Peter; Fang, Zheyu

doi:10.1021/acsnano.5b03764

Cited by 200 publications

(185 citation statements)

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“…Secondly a WS 2 monolayer was transferred onto hole arrays milled by focused ion beam in a Au film (see schematic in Figure 2c). A 5 nm PMMA film was spin coated onto the array first to avoid emission quenching, 32 or hot electron transfer between Au and the semiconductor, 33,34 nevertheless the monolayer is still positioned near the plasmonic field maximum at the interface.…”

Section: 30mentioning

confidence: 99%

Coherent Coupling of WS₂ Monolayers with Metallic Photonic Nanostructures at Room Temperature

et al. 2016

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：Room temperature strong coupling of WS 2 monolayer exciton transitions to metallic Fabry-Perot and plasmonic optical cavities is demonstrated. A Rabi splitting of 101 meV is observed for the Fabry-Perot cavity, more than double those reported to date in other 2D materials. The enhanced magnitude and visibility of WS 2 monolayer strong coupling is attributed to the larger absorption coefficient, the narrower linewidth of the A exciton transition, and greater spin-orbit coupling. For WS 2 coupled to plasmonic arrays, the Rabi splitting still reaches 60 meV despite the less favorable coupling conditions, and displays interesting photoluminescence features. The unambiguous signature of WS 2 monolayer strong coupling in easily fabricated metallic resonators at room temperature suggests many possibilities for combining light-matter hybridization with spin and valleytronics. induces the splitting of the excitonic transition by ca. 150 meV such that both the so-called A and B exciton transitions (see Figure 1b) can simultaneously interact with cavity modes complicating the studies of such systems. 27 The WS 2 monolayer has the advantage that it presents a much sharper isolated absorption band as can be seen in Figure 1b. In addition it displays an intense photoluminescence (PL) peak at 2.016 eV (Figure 1c). Hence WS 2 constitutes a natural choice for light-matter strong coupling. In this letter we demonstrate that by coupling WS 2 monolayers to metallic resonators, the magnitude and visibility of light-monolayer TMD strong coupling at room temperature is substantially enhanced with a Rabi splitting of 101 meV in Fabry-Perot cavities and 60 meV on plasmonic arrays. The energy-momentum dispersion properties of the monolayer WS 2 excitonpolaritons are explored by transmission, reflection and photoluminescence (PL) spectroscopy. In particular Rabi splittings in TE and TM dispersion curves give rise to unusual PL behavior. The results are discussed in terms of the potential of coherent light-matter interactions using WS 2 monolayers.To ensure high quality samples and to avoid environmental contamination, the TMD monolayers were exfoliated from bulk single crystals and then dry-transferred onto substrates as the holes possibly due to two factors: firstly, the plasmonic field has a maximum above the holes, enhancing the photonic mode density at this point, thereby increasing the excitonic radiative rate, 32 and secondly the increased dielectric screening where the monolayer is suspended over the hole rather than in Van der Waals contact with the substrate could enhance the emission. 10Angle-resolved transmission spectra of the FP cavity with WS 2 monolayer are shown in Figure 3a for TE polarization. The progressive dispersion of the cavity mode through the energy of the A exciton is accompanied by a clear anti-crossing, which is mapped out in terms of spectral maxima in Figure 3b. After fitting the energy of the two peaks as a function of in-plane momentum k // using the coupled oscillator model (described in the Met...

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Section: 30mentioning

confidence: 99%

Coherent Coupling of WS₂ Monolayers with Metallic Photonic Nanostructures at Room Temperature

et al. 2016

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“…On the contrary, plasmonics enable strong light-matter interaction with 2D materials due to high field concentration [135][136][137][138]. Additionally, it has been shown that surface plasmons in metallic nanoparticles can directly interact with 2D materials through hot electron injection [42,[139][140][141][142][143]. For instance, hot electrons can change the doping of graphene [140] or molybdenum disulfide (MoS 2 ) [42,143], leading to structural phase transitions [42] or modulation of the absorption spectrum [143].…”

Section: Hot Electrons With 2d Materialsmentioning

confidence: 99%

“…Additionally, it has been shown that surface plasmons in metallic nanoparticles can directly interact with 2D materials through hot electron injection [42,[139][140][141][142][143]. For instance, hot electrons can change the doping of graphene [140] or molybdenum disulfide (MoS 2 ) [42,143], leading to structural phase transitions [42] or modulation of the absorption spectrum [143]. Hot electrons can also be used for enhancing MoS 2 photocatalysis of hydrogen evolution [144] and the photoluminescence of MoS 2 [141].…”

Section: Hot Electrons With 2d Materialsmentioning

confidence: 99%

“…Although we have focused on the hot electron-based photodetection, the basic principles and designs presented here can be applied to any system where charge separation is involved, such as photovoltaics [27,34,102], photocatalysis [27,39,40], as well as light emission [43] and modulation [143]. There are many open challenges in the field such as establishing a better understanding of the carrier injection process, characterizing device speed, and exploring a wider range of plasmonic materials.…”

Section: -156mentioning

confidence: 99%

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Harvesting the loss: surface plasmon-based hot electron photodetection

2016

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Abstract:Although the nonradiative decay of surface plasmons was once thought to be only a parasitic process within the plasmonic and metamaterial communities, hot carriers generated from nonradiative plasmon decay offer new opportunities for harnessing absorption loss. Hot carriers can be harnessed for applications ranging from chemical catalysis, photothermal heating, photovoltaics, and photodetection. Here, we present a review on the recent developments concerning photodetection based on hot electrons. The basic principles and recent progress on hot electron photodetectors are summarized. The challenges and potential future directions are also discussed.

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“…The exciton effect has an essential influence on the physical processes and optical properties in semiconductors [60][61][62] . The absorption and recombination of excitons directly affect the light absorption and luminescence of semiconductors.…”

Section: Microscopy For Semiconductorsmentioning

confidence: 99%

Scanning cathodoluminescence microscopy: applications in semiconductor and metallic nanostructures

Liu¹,

Jiang²,

Hu³

et al. 2018

Opto-Electronic Advances

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Cathodoluminescence (CL) as a radiative light produced by an electron beam exciting a luminescent material, has been widely used in imaging and spectroscopic detection of semiconductor, mineral and biological samples with an ultrahigh spatial resolution. Conventional CL spectroscopy shows an excellent performance in characterization of traditional material luminescence, such as spatial composition variations and fluorescent displays. With the development of nanotechnology, advances of modern microscopy enable CL technique to obtain deep valuable insight of the testing sample, and further extend its applications in the material science, especially for opto-electronic investigations at nanoscale. In this article, we review the study of CL microscopy applied in semiconductor nanostructures for the dislocation, carrier diffusion, band structure, doping level and exciton recombination. Then advantages of CL in revealing and manipulating surface plasmon resonances of metallic nanoantennas are discussed. Finally, the challenge of CL technology is summarized, and potential CL applications for the future opto-electronic study are proposed.

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Active Light Control of the MoS₂ Monolayer Exciton Binding Energy

Cited by 200 publications

References 34 publications

Coherent Coupling of WS₂ Monolayers with Metallic Photonic Nanostructures at Room Temperature

Coherent Coupling of WS₂ Monolayers with Metallic Photonic Nanostructures at Room Temperature

Harvesting the loss: surface plasmon-based hot electron photodetection

Scanning cathodoluminescence microscopy: applications in semiconductor and metallic nanostructures

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Active Light Control of the MoS2 Monolayer Exciton Binding Energy

Cited by 200 publications

References 34 publications

Coherent Coupling of WS2 Monolayers with Metallic Photonic Nanostructures at Room Temperature

Coherent Coupling of WS2 Monolayers with Metallic Photonic Nanostructures at Room Temperature

Harvesting the loss: surface plasmon-based hot electron photodetection

Scanning cathodoluminescence microscopy: applications in semiconductor and metallic nanostructures

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Product

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Active Light Control of the MoS₂ Monolayer Exciton Binding Energy

Coherent Coupling of WS₂ Monolayers with Metallic Photonic Nanostructures at Room Temperature

Coherent Coupling of WS₂ Monolayers with Metallic Photonic Nanostructures at Room Temperature