scholarly journals Naturally occurring van der Waals heterostructure lengenbachite with strong in-plane structural and optical anisotropy

2021 ◽  
Vol 5 (1) ◽  
Author(s):  
Arindam Dasgupta ◽  
Xiaodong Yang ◽  
Jie Gao
Keyword(s):  
Integrated Circuits ◽  
Optical Anisotropy ◽  
Van Der Waals ◽  
Phase Segregation ◽  
Linear Dichroism ◽  
Structural Anisotropy ◽  
Third Harmonic ◽  
2D Material ◽  
Naturally Occurring ◽  
Vdw Heterostructure

AbstractLengenbachite is a naturally occurring layered mineral formed with alternating stacks of two constituent PbS-like and M2S3-like two-dimensional (2D) material layers due to the phase segregation process during the formation. Here, we demonstrate to achieve van der Waals (vdW) heterostructures of lengenbachite down to a few layer-pair thickness by mechanical exfoliation of bulk lengenbachite mineral. The incommensurability between the constituent isotropic 2D material layers makes the formed vdW heterostructure exhibit strong in-plane structural anisotropy, which leads to highly anisotropic optical responses in lengenbachite thin flakes, including anisotropic Raman scattering, linear dichroism, and anisotropic third-harmonic generation. Moreover, we exploit the nonlinear optical anisotropy for polarization-dependent intensity modulation of the converted third-harmonic optical vortices. Our study establishes lengenbachite as a new natural vdW heterostructure-based 2D material with unique optical properties for realizing anisotropic optical devices for photonic integrated circuits and optical information processing.

scholarly journals Natural van der Waals heterostructure cylindrite with highly anisotropic optical responses

2021 ◽  
Vol 5 (1) ◽  
Author(s):  
Arindam Dasgupta ◽  
Jie Gao ◽  
Xiaodong Yang
Keyword(s):  
Van Der Waals ◽  
Linear Dichroism ◽  
Third Harmonic ◽  
Inhomogeneous Strain ◽  
Optical Responses ◽  
Naturally Occurring ◽  
Van Der Waals Heterostructure ◽  
Vdw Heterostructure ◽  
Polarized Raman ◽  
On Chip

AbstractThe mechanical exfoliation of naturally occurring layered materials has emerged as an easy and effective method for achieving ultrathin van der Waals (vdW) heterostructures with well-defined lattice orientations of the constituent two-dimensional (2D) material layers. Cylindrite is one such naturally occurring vdW heterostructure, where the superlattice is composed of alternating stacks of SnS2-like and PbS-like layers. Although the constituent 2D lattices are isotropic, inhomogeneous strain occurring from local atomic alignment for forcing the commensuration makes the cylindrite superlattice structurally anisotropic. Here, we demonstrate the highly anisotropic optical responses of cylindrite thin flakes induced by the anisotropic crystal structure, including angle-resolved polarized Raman scattering, linear dichroism, and polarization-dependent anisotropic third-harmonic generation. Our results provide a promising approach for identifying various natural vdW heterostructure-based 2D materials with tailored optical properties and can be harnessed for realizing anisotropic optical devices for on-chip photonic circuits and optical information processing.

A first-principles study on the electronic and optical properties of a type-II C2N/g-ZnO van der Waals heterostructure

2021 ◽  
Vol 23 (6) ◽  
pp. 3963-3973
Author(s):  
Jianxun Song ◽  
Hua Zheng ◽  
Minxia Liu ◽  
Geng Zhang ◽  
Dongxiong Ling ◽  
...  
Keyword(s):  
Optical Properties ◽  
Dft Calculations ◽  
First Principles ◽  
Van Der Waals ◽  
Band Alignment ◽  
Type Ii ◽  
Electronic And Optical Properties ◽  
Direct Bandgap ◽  
Van Der Waals Heterostructure ◽  
Vdw Heterostructure

The structural, electronic and optical properties of a new vdW heterostructure, C2N/g-ZnO, with an intrinsic type-II band alignment and a direct bandgap of 0.89 eV at the Γ point are extensively studied by DFT calculations.

scholarly journals First-Principles Study of a MoS2-PbS van der Waals Heterostructure Inspired by Naturally Occurring Merelaniite

Materials ◽  
2021 ◽  
Vol 14 (7) ◽  
pp. 1649
Author(s):  
Gemechis D. Degaga ◽  
Sumandeep Kaur ◽  
Ravindra Pandey ◽  
John A. Jaszczak
Keyword(s):  
Density Functional ◽  
Van Der Waals ◽  
Hole Mobility ◽  
Functional Theory ◽  
Mos2 Monolayer ◽  
Naturally Occurring ◽  
Weak Interlayer ◽  
Bulk Structure ◽  
P Type ◽  
Interlayer Bonding

Vertically stacked, layered van der Waals (vdW) heterostructures offer the possibility to design materials, within a range of chemistries and structures, to possess tailored properties. Inspired by the naturally occurring mineral merelaniite, this paper studies a vdW heterostructure composed of a MoS2 monolayer and a PbS bilayer, using density functional theory. A commensurate 2D heterostructure film and the corresponding 3D periodic bulk structure are compared. The results find such a heterostructure to be stable and possess p-type semiconducting characteristics. Due to the heterostructure’s weak interlayer bonding, its carrier mobility is essentially governed by the constituent layers; the hole mobility is governed by the PbS bilayer, whereas the electron mobility is governed by the MoS2 monolayer. Furthermore, we estimate the hole mobility to be relatively high (~106 cm2V−1s−1), which can be useful for ultra-fast devices at the nanoscale.

Covalent modification of franckeite with maleimides: connecting molecules and van der Waals heterostructures

2021 ◽  
Author(s):  
Julia Villalva ◽  
Sara Moreno-Da Silva ◽  
Palmira Villa ◽  
Luisa Ruiz-González ◽  
Cristina Navío ◽  
...  
Keyword(s):  
Click Chemistry ◽  
Van Der Waals ◽  
Covalent Modification ◽  
Van Der Waals Heterostructures ◽  
Naturally Occurring ◽  
Van Der Waals Heterostructure

We show that thiol–ene-like “click” chemistry can be used to decorate franckeite, a naturally occurring van der Waals heterostructure with maleimide reagents. In this way, we provide a pathway towards 2D–2D–0D mixed-dimensional heterostructures.

Two-dimensional C3N/blue phosphorene vdW heterostructure for Li, Na and K-ion batteries

2021 ◽  
Author(s):  
Mohammad Ubaid ◽  
Anver Aziz ◽  
Bhalchandra S. Pujari
Keyword(s):  
Van Der Waals ◽  
Potassium Ion ◽  
Two Dimensional ◽  
Van Der Waals Heterostructure ◽  
Vdw Heterostructure ◽  
Sodium And Potassium ◽  
Blue Phosphorene

We investigate a van der Waals heterostructure constructed using BP and C3N and investigate its use as an anode for lithium-, sodium- and potassium-ion batteries.

Magnetism and Optical Anisotropy in van der Waals Antiferromagnetic Insulator CrOCl

ACS Nano ◽  
2019 ◽  
Vol 13 (10) ◽  
pp. 11353-11362 ◽  
Author(s):  
Tianle Zhang ◽  
Yimeng Wang ◽  
Hexuan Li ◽  
Fang Zhong ◽  
Jia Shi ◽  
...  
Keyword(s):  
Optical Anisotropy ◽  
Van Der Waals

scholarly journals Symmetry Breakdown in Franckeite: Spontaneous Strain, Rippling and Interlayer Moiré

2019 ◽  
Author(s):  
Riccardo Frisenda ◽  
Gabriel Sanchez-Santolino ◽  
Nikos Papadopoulos ◽  
Joanna Urban ◽  
Michal Baranowski ◽  
...  
Keyword(s):  
Optical Properties ◽  
Plane Strain ◽  
Van Der Waals ◽  
Van Der Waals Interaction ◽  
Spatial Modulation ◽  
Two Dimensional ◽  
Spontaneous Strain ◽  
Strain Profile ◽  
Symmetry Breakdown ◽  
Naturally Occurring

<p>Franckeite is a naturally occurring layered mineral with a structure composed of alternating stacks of SnS<sub>2</sub>-like and PbS-like layers. Although this superlattice is composed of a sequence of isotropic two-dimensional layers, it exhibits a spontaneous rippling that makes the material structurally anisotropic. We demonstrate that this rippling comes hand in hand with an inhomogeneous in-plane strain profile and anisotropic electrical, vibrational and optical properties. We argue that this symmetry breakdown results from a spatial modulation of the van der Waals interaction between layers due to the SnS<sub>2</sub>-like and PbS-like lattices incommensurability.</p>

Ultrahigh-photoresponsive UV photodetector based on a BP/ReS2 heterostructure p–n diode

Nanoscale ◽  
2018 ◽  
Vol 10 (35) ◽  
pp. 16805-16811 ◽  
Author(s):  
Shiwei Cao ◽  
Yanhui Xing ◽  
Jun Han ◽  
Xin Luo ◽  
Wenxing Lv ◽  
...  
Keyword(s):  
Lattice Mismatch ◽  
Van Der Waals ◽  
Optoelectronic Properties ◽  
Van Der Waals Interactions ◽  
Two Dimensional ◽  
Interface Quality ◽  
Uv Photodetector ◽  
Mismatch Problem ◽  
Two Dimensional Materials ◽  
Vdw Heterostructure

The van der Waals (vdW) heterostructure, made up of two dissimilar two-dimensional materials held together by van der Waals interactions, has excellent electronic and optoelectronic properties as it provides a superior interface quality without the lattice mismatch problem.

The strain effect on the electronic properties of the MoSSe/WSSe van der Waals heterostructure: a first-principles study

2020 ◽  
Vol 22 (9) ◽  
pp. 4946-4956 ◽  
Author(s):  
Wenyu Guo ◽  
Xun Ge ◽  
Shoutian Sun ◽  
Yiqun Xie ◽  
Xiang Ye
Keyword(s):  
Electronic Properties ◽  
First Principles ◽  
Van Der Waals ◽  
Strain Effect ◽  
Vertical Strain ◽  
First Principles Study ◽  
Van Der Waals Heterostructure ◽  
Vdw Heterostructure

The structural, mechanical and electronic properties of the MoSSe/WSSe van der Waals (vdW) heterostructure under various degrees of horizontal and vertical strain are systematically investigated based on first-principles methods.

Determination of optimum optoelectronic properties in vertically stacked MoS2/h-BN/WSe2 van der Waals heterostructures

2019 ◽  
Vol 21 (41) ◽  
pp. 23179-23186 ◽  
Author(s):  
Shilin Tan ◽  
Yipeng Zhao ◽  
Jiansheng Dong ◽  
Guowei Yang ◽  
Gang Ouyang
Keyword(s):  
Solar Cell ◽  
Conversion Efficiency ◽  
Van Der Waals ◽  
Optoelectronic Properties ◽  
Photoelectric Conversion Efficiency ◽  
Optimal Thickness ◽  
Photoelectric Conversion ◽  
Van Der Waals Heterostructures ◽  
Vdw Heterostructure

Inserting an insulator at the interface in vdW heterostructure solar cell unit can improve the photoelectric conversion efficiency, and the insulator has an optimal thickness.

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