Patterning metal contacts on monolayer MoS2 with vanishing Schottky barriers using thermal nanolithography

Zheng, Xiaorui; Calò, Annalisa; Albisetti, Edoardo; Liu, Xiangyu; Alharbi, Abdullah; Arefe, Ghidewon; Liu, Xiaochi; Spieser, Martin; Yoo, Won Jong; Taniguchi, Takashi; Watanabe, Kenji; Aruta, C.; Ciarrocchi, Alberto; Kis, András; Lee, Brian S.; Lipson, Michal; Hone, James; Shahrjerdi, Davood; Riedo, Elisa

doi:10.1038/s41928-018-0191-0

Cited by 133 publications

(119 citation statements)

References 65 publications

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“…Effective implementation of many techniques, including directed assembly, nanoimprinting, and lithography combined with electron-beam etching, thermochemical, and scanning probe technologies, for fabricating structures with high spatial resolution has been demonstrated, but these techniques are time consuming, costly, or lack versatility [9][10][11][12][13] . In contrast, femtosecond laser-based processing, associated with the benefits of being facile, maskless, and efficient, is a qualified candidate for industrial development 14 , and recently, it has been applied in the micro/nanomanufacturing of graphene analogs, such as typical patterning of GO films 15 .…”

Section: Introductionmentioning

confidence: 99%

High-speed femtosecond laser plasmonic lithography and reduction of graphene oxide for anisotropic photoresponse

et al. 2020

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Micro/nanoprocessing of graphene surfaces has attracted significant interest for both science and applications due to its effective modulation of material properties, which, however, is usually restricted by the disadvantages of the current fabrication methods. Here, by exploiting cylindrical focusing of a femtosecond laser on graphene oxide (GO) films, we successfully produce uniform subwavelength grating structures at high speed along with a simultaneous in situ photoreduction process. Strikingly, the well-defined structures feature orientations parallel to the laser polarization and significant robustness against distinct perturbations. The proposed model and simulations reveal that the structure formation is based on the transverse electric (TE) surface plasmons triggered by the gradient reduction of the GO film from its surface to the interior, which eventually results in interference intensity fringes and spatially periodic interactions. Further experiments prove that such a regular structured surface can cause enhanced optical absorption (>20%) and an anisotropic photoresponse (~0.46 ratio) for the reduced GO film. Our work not only provides new insights into understanding the laser-GO interaction but also lays a solid foundation for practical usage of femtosecond laser plasmonic lithography, with the prospect of expansion to other two-dimensional materials for novel device applications.

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Section: Introductionmentioning

confidence: 99%

High-speed femtosecond laser plasmonic lithography and reduction of graphene oxide for anisotropic photoresponse

et al. 2020

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“…For writing the spin texture of the SAF, a highly localized field cooling is performed via tam‐SPL, by sweeping a heated scanning probe on the surface of the sample in an applied external field (see Experimental Section). This allows us to spatially control the exchange bias direction, and therefore the magnetization orientation of the top CoFeB layer, at remanence.…”

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confidence: 99%

Optically Inspired Nanomagnonics with Nonreciprocal Spin Waves in Synthetic Antiferromagnets

et al. 2020

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Integrated optically inspired wave‐based processing is envisioned to outperform digital architectures in specific tasks, such as image processing and speech recognition. In this view, spin waves represent a promising route due to their nanoscale wavelength in the gigahertz frequency range and rich phenomenology. Here, a versatile, optically inspired platform using spin waves is realized, demonstrating the wavefront engineering, focusing, and robust interference of spin waves with nanoscale wavelength. In particular, magnonic nanoantennas based on tailored spin textures are used for launching spatially shaped coherent wavefronts, diffraction‐limited spin‐wave beams, and generating robust multi‐beam interference patterns, which spatially extend for several times the spin‐wave wavelength. Furthermore, it is shown that intriguing features, such as resilience to back reflection, naturally arise from the spin‐wave nonreciprocity in synthetic antiferromagnets, preserving the high quality of the interference patterns from spurious counterpropagating modes. This work represents a fundamental step toward the realization of nanoscale optically inspired devices based on spin waves.

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“…Contact engineering between 2D materials and bulk materials (such as metallic electrodes) has been a key issue of 2D electronics [34,35]. Conventional techniques are problematic in terms of impurities (optical lithography and electron beam lithography), which give rise to a large contact resistance.…”

Section: Transfer Of 2d Materials With Pre-deposited Metal Filmsmentioning

confidence: 99%

Movable-Type Transfer and Stacking of van der Waals Heterostructures for Spintronics

et al. 2020

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The key to achieving high-quality van der Waals heterostructure devices made from various two-dimensional (2D) materials lies in the control over clean and flexible interfaces. However, existing transfer methods based on different mediators possess insufficiencies including the presence of residues, the unavailability of flexi ble interface engineering, and the selectivity towards materials and substrates since their adhesions differ considerably with the various preparation conditions, from chemical vapor deposition (CVD) growth to mechanical exfoliation. In this paper, we intr oduce a more universal method using a prefabricated polyvinyl alcohol (PVA) film to transfer and stack 2D materials, whether they are prepared by CVD or exfoliation. This peel-off and drop-off technique promises an ideal interface of the materials without introducing contamination. In addition, the method exhibits a micron-scale spatial transfer accuracy and meets special experimental conditions such as the preparation of twisted graphene and the 2D/metal heterostructure construction. We illustrate the superiority of this method with a WSe2 vertical spin valve device, whose performance verifies the applicability and advantages of such a method for spintronics. Our PVA-assisted transfer process will promote the development of high-performance 2D-material-based devices.

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Patterning metal contacts on monolayer MoS2 with vanishing Schottky barriers using thermal nanolithography

Cited by 133 publications

References 65 publications

High-speed femtosecond laser plasmonic lithography and reduction of graphene oxide for anisotropic photoresponse

High-speed femtosecond laser plasmonic lithography and reduction of graphene oxide for anisotropic photoresponse

Optically Inspired Nanomagnonics with Nonreciprocal Spin Waves in Synthetic Antiferromagnets

Movable-Type Transfer and Stacking of van der Waals Heterostructures for Spintronics

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