scholarly journals Electronic, mechanical, optical and photocatalytic properties of two-dimensional Janus XGaInY (X, Y ;= S, Se and Te) monolayers

RSC Advances ◽  
2021 ◽  
Vol 11 (28) ◽  
pp. 17230-17239
Author(s):  
Iqtidar Ahmad ◽  
Ismail Shahid ◽  
Anwar Ali ◽  
Lei Gao ◽  
Jinming Cai
Keyword(s):  
Photocatalytic Properties ◽  
Two Dimensional ◽  
Two Dimensional Materials ◽  
Out Of Plane

Janus monolayers with breaking out-of-plane structural symmetries and spontaneous electric polarizations offer new possibilities in the field of two-dimensional materials.

scholarly journals Optical detection of the susceptibility tensor in two-dimensional crystals

2021 ◽  
Vol 4 (1) ◽  
Author(s):  
Zhemi Xu ◽  
Davide Ferraro ◽  
Annamaria Zaltron ◽  
Nicola Galvanetto ◽  
Alessandro Martucci ◽  
...  
Keyword(s):  
Single Layer ◽  
Optical Response ◽  
Optical Measurements ◽  
Two Dimensional ◽  
Reliable Determination ◽  
Susceptibility Tensor ◽  
Two Dimensional Materials ◽  
Out Of Plane

AbstractThe out-of-plane optical constants of monolayer two-dimensional materials have proven to be experimentally elusive. Owing to their reduced dimensionality, optical measurements have limited sensitivity to these properties which are hidden by the optical response of the substrate. Therefore, there remains an absence of scientific consensus on how to correctly model these crystals. Here we perform an experiment on the optical response of a single-layer two-dimensional crystal that addresses these problems. We successfully remove the substrate contribution to its optical response by a step deposition of a monolayer crystal inside a thick polydimethylsiloxane prism. This allows for a reliable determination of both the in-plane and the out-of-plane components of its surface susceptibility tensor. Our results prescribe one clear theoretical model for these crystals. This precise characterization of their optical properties will be relevant to future progresses in photonics and optoelectronics with two-dimensional materials.

scholarly journals Engineering photonic environments for two-dimensional materials

Nanophotonics ◽  
2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Xuezhi Ma ◽  
Nathan Youngblood ◽  
Xiaoze Liu ◽  
Yan Cheng ◽  
Preston Cunha ◽  
...  
Keyword(s):  
Degrees Of Freedom ◽  
2D Materials ◽  
Research Field ◽  
Chemical Compositions ◽  
Two Dimensional ◽  
Two Dimensional Materials ◽  
Out Of Plane ◽  
Small Device ◽  
Light Matter Interaction ◽  
Three Degrees Of Freedom

AbstractA fascinating photonic platform with a small device scale, fast operating speed, as well as low energy consumption is two-dimensional (2D) materials, thanks to their in-plane crystalline structures and out-of-plane quantum confinement. The key to further advancement in this research field is the ability to modify the optical properties of the 2D materials. The modifications typically come from the materials themselves, for example, altering their chemical compositions. This article reviews a comparably less explored but promising means, through engineering the photonic surroundings. Rather than modifying materials themselves, this means manipulates the dielectric and metallic environments, both uniform and nanostructured, that directly interact with the materials. For 2D materials that are only one or a few atoms thick, the interaction with the environment can be remarkably efficient. This review summarizes the three degrees of freedom of this interaction: weak coupling, strong coupling, and multifunctionality. In addition, it reviews a relatively timing concept of engineering that directly applied to the 2D materials by patterning. Benefiting from the burgeoning development of nanophotonics, the engineering of photonic environments provides a versatile and creative methodology of reshaping light–matter interaction in 2D materials.

scholarly journals Optical detection of the susceptibility tensor in two-dimensional crystals

2021 ◽  
Author(s):  
Michele Merano ◽  
Zhemi Xu ◽  
Davide Ferraro ◽  
Annamaria Zaltron ◽  
Nicola Galvanetto ◽  
...  
Keyword(s):  
Plane Surface ◽  
Three Dimensional ◽  
Single Layer ◽  
Optical Response ◽  
Optical Measurements ◽  
Two Dimensional ◽  
Reliable Determination ◽  
Susceptibility Tensor ◽  
Two Dimensional Materials ◽  
Out Of Plane

Abstract The out-of-plane optical constants of two-dimensional materials have proven to be experimentally elusive. Owing to the reduced dimensionality of a monolayer, optical measurements have limited sensitivity to these properties, which are hidden by the optical response of the substrate. Therefore, there remains an absence of scientific consensus on how to correctly model these materials. Theoretical descriptions span from isotropic three-dimensional slabs to two-dimensional surface currents with a null out-of-plane surface susceptibility. Here we perform a smoking gun experiment on the optical response of a single-layer two-dimensional crystal that addresses these problems. We successfully remove the substrate contribution to the optical response of these materials by a step deposition of a monolayer crystal inside a thick polydimethylsiloxane prism. This allows for a reliable determination of both the in-plane and the out-of-plane components of the monolayer surface susceptibility tensor. Our results prescribe one clear theoretical model for these types of material. This work creates opportunities for a precise characterization of the optical properties of two-dimensional crystals in all the optical domains such as the nonlinear response, surface wave phenomena or magneto-optical Kerr effect. Our assay will be relevant to future progresses in photonics and optoelectronics with 2D materials.

Electronic structures, and optical and photocatalytic properties of the BP–BSe van der Waals heterostructures

2020 ◽  
Vol 44 (35) ◽  
pp. 14964-14969 ◽  
Author(s):  
Khang D. Pham ◽  
Lam V. Tan ◽  
M. Idrees ◽  
Bin Amin ◽  
Nguyen N. Hieu ◽  
...  
Keyword(s):  
Electronic Structures ◽  
Van Der Waals ◽  
Photocatalytic Properties ◽  
Two Dimensional ◽  
Van Der Waals Heterostructures ◽  
Two Dimensional Materials

The combination of two-dimensional materials in the form of van der Waals (vdW) heterostructures has been shown to be an effective method for designing electronic and optoelectronic equipment.

Strain-tunable out-of-plane polarization in two-dimensional materials

2020 ◽  
Vol 101 (12) ◽  
Author(s):  
J. Z. Zhao ◽  
L. C. Chen ◽  
B. Xu ◽  
B. B. Zheng ◽  
J. Fan ◽  
...  
Keyword(s):  
Two Dimensional ◽  
Two Dimensional Materials ◽  
Out Of Plane

Redox-Active Approach Towards New Magnetic And Conductive Two-Dimensional Materials

2018 ◽  
Author(s):  
Penny Perlepe ◽  
Rodolphe Clérac ◽  
Itziar Oyarzabal ◽  
Corine Mathonière
Keyword(s):  
Two Dimensional ◽  
Active Approach ◽  
Redox Active ◽  
Two Dimensional Materials

scholarly journals Polarization-sensitive photodetectors based on three-dimensional molybdenum disulfide (MoS2) field-effect transistors

Nanophotonics ◽  
2020 ◽  
Vol 9 (16) ◽  
pp. 4719-4728
Author(s):  
Tao Deng ◽  
Shasha Li ◽  
Yuning Li ◽  
Yang Zhang ◽  
Jingye Sun ◽  
...  
Keyword(s):  
Molybdenum Disulfide ◽  
Field Effect ◽  
High Performance ◽  
Field Effect Transistors ◽  
Three Dimensional ◽  
Polarized Light ◽  
Optical Field ◽  
Two Dimensional ◽  
Polarization Ratio ◽  
Two Dimensional Materials

AbstractThe molybdenum disulfide (MoS2)-based photodetectors are facing two challenges: the insensitivity to polarized light and the low photoresponsivity. Herein, three-dimensional (3D) field-effect transistors (FETs) based on monolayer MoS2 were fabricated by applying a self–rolled-up technique. The unique microtubular structure makes 3D MoS2 FETs become polarization sensitive. Moreover, the microtubular structure not only offers a natural resonant microcavity to enhance the optical field inside but also increases the light-MoS2 interaction area, resulting in a higher photoresponsivity. Photoresponsivities as high as 23.8 and 2.9 A/W at 395 and 660 nm, respectively, and a comparable polarization ratio of 1.64 were obtained. The fabrication technique of the 3D MoS2 FET could be transferred to other two-dimensional materials, which is very promising for high-performance polarization-sensitive optical and optoelectronic applications.

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