scholarly journals Anisotropic moiré optical transitions in twisted monolayer/bilayer phosphorene heterostructures

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Shilong Zhao ◽  
Erqing Wang ◽  
Ebru Alime Üzer ◽  
Shuaifei Guo ◽  
Ruishi Qi ◽  
...  
Keyword(s):  
Electronic Structures ◽  
Twist Angle ◽  
Van Der Waals ◽  
Rectangular Lattice ◽  
Transition Metal Dichalcogenide ◽  
Optical Transitions ◽  
Van Der Waals Heterostructures ◽  
Optical Resonances ◽  
Two Dimensional Materials ◽  
Quantum Phenomena

AbstractMoiré superlattices of van der Waals heterostructures provide a powerful way to engineer electronic structures of two-dimensional materials. Many novel quantum phenomena have emerged in graphene and transition metal dichalcogenide moiré systems. Twisted phosphorene offers another attractive system to explore moiré physics because phosphorene features an anisotropic rectangular lattice, different from isotropic hexagonal lattices previously reported. Here we report emerging anisotropic moiré optical transitions in twisted monolayer/bilayer phosphorenes. The optical resonances in phosphorene moiré superlattice depend sensitively on twist angle and are completely different from those in the constitute monolayer and bilayer phosphorene even for a twist angle as large as 19°. Our calculations reveal that the Γ-point direct bandgap and the rectangular lattice of phosphorene give rise to the remarkably strong moiré physics in large-twist-angle phosphorene heterostructures. This work highlights fresh opportunities to explore moiré physics in phosphorene and other van der Waals heterostructures with different lattice configurations.

scholarly journals Exotic Physical Properties of 2D Materials Modulated by Moiré Superlattices

2021 ◽  
Author(s):  
Beibei Shi ◽  
Pengfei Qi ◽  
Meiling Jiang ◽  
Yuchen Dai ◽  
Feng Lin ◽  
...  
Keyword(s):  
Physical Properties ◽  
2D Materials ◽  
Van Der Waals ◽  
Two Dimensional ◽  
Van Der Waals Heterostructures ◽  
Moire Pattern ◽  
Moiré Pattern ◽  
Two Dimensional Materials ◽  
Quantum Phenomena

Van der Waals heterostructures of two-dimensional materials are naturally endowed with the nanoscale moiré pattern, which has become a versatile platform for studying novel quantum phenomena during past decades. Here,...

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.

Intriguing electronic structures and optical properties of two-dimensional van der Waals heterostructures of Zr2CT2 (T = O, F) with MoSe2 and WSe2

2018 ◽  
Vol 6 (11) ◽  
pp. 2830-2839 ◽  
Author(s):  
Gul Rehman ◽  
S. A. Khan ◽  
B. Amin ◽  
Iftikhar Ahmad ◽  
Li-Yong Gan ◽  
...  
Keyword(s):  
Optical Properties ◽  
Material Properties ◽  
First Principles ◽  
Electronic Structures ◽  
Van Der Waals ◽  
Transition Metal Dichalcogenides ◽  
Two Dimensional ◽  
First Principles Calculations ◽  
Van Der Waals Heterostructures ◽  
Metal Dichalcogenides

Based on (hybrid) first-principles calculations, material properties (structural, electronic, vibrational, optical, and photocatalytic) of van der Waals heterostructures and their corresponding monolayers (transition metal dichalcogenides and MXenes) are investigated.

scholarly journals Twist-angle dependence of moiré excitons in WS2/MoSe2 heterobilayers

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Long Zhang ◽  
Zhe Zhang ◽  
Fengcheng Wu ◽  
Danqing Wang ◽  
Rahul Gogna ◽  
...  
Keyword(s):  
Experimental Study ◽  
Effective Mass ◽  
Critical Parameter ◽  
Twist Angle ◽  
Van Der Waals ◽  
Reciprocal Lattice ◽  
Lattice Period ◽  
Van Der Waals Heterostructures ◽  
Angle Dependence ◽  
The Way

AbstractMoiré lattices formed in twisted van der Waals bilayers provide a unique, tunable platform to realize coupled electron or exciton lattices unavailable before. While twist angle between the bilayer has been shown to be a critical parameter in engineering the moiré potential and enabling novel phenomena in electronic moiré systems, a systematic experimental study as a function of twist angle is still missing. Here we show that not only are moiré excitons robust in bilayers of even large twist angles, but also properties of the moiré excitons are dependant on, and controllable by, the moiré reciprocal lattice period via twist-angle tuning. From the twist-angle dependence, we furthermore obtain the effective mass of the interlayer excitons and the electron inter-layer tunneling strength, which are difficult to measure experimentally otherwise. These findings pave the way for understanding and engineering rich moiré-lattice induced phenomena in angle-twisted semiconductor van der Waals heterostructures.

Disassembling 2D van der Waals crystals into macroscopic monolayers and reassembling into artificial lattices

Science ◽  
2020 ◽  
Vol 367 (6480) ◽  
pp. 903-906 ◽  
Author(s):  
Fang Liu ◽  
Wenjing Wu ◽  
Yusong Bai ◽  
Sang Hoon Chae ◽  
Qiuyang Li ◽  
...  
Keyword(s):  
Mass Production ◽  
Van Der Waals ◽  
Great Promise ◽  
Layer By Layer ◽  
Transition Metal Dichalcogenide ◽  
High Quality ◽  
Quantum Devices ◽  
Artificial Materials ◽  
Two Dimensional Materials ◽  
One Step

Two-dimensional materials from layered van der Waals (vdW) crystals hold great promise for electronic, optoelectronic, and quantum devices, but technological implementation will be hampered by the lack of high-throughput techniques for exfoliating single-crystal monolayers with sufficient size and high quality. Here, we report a facile method to disassemble vdW single crystals layer by layer into monolayers with near-unity yield and with dimensions limited only by bulk crystal sizes. The macroscopic monolayers are comparable in quality to microscopic monolayers from conventional Scotch tape exfoliation. The monolayers can be assembled into macroscopic artificial structures, including transition metal dichalcogenide multilayers with broken inversion symmetry and substantially enhanced nonlinear optical response. This approach takes us one step closer to mass production of macroscopic monolayers and bulk-like artificial materials with controllable properties.

Probing Evolution of Twist-Angle-Dependent Interlayer Excitons in MoSe2/WSe2 van der Waals Heterostructures

ACS Nano ◽  
2017 ◽  
Vol 11 (4) ◽  
pp. 4041-4050 ◽  
Author(s):  
Pramoda K. Nayak ◽  
Yevhen Horbatenko ◽  
Seongjoon Ahn ◽  
Gwangwoo Kim ◽  
Jae-Ung Lee ◽  
...  
Keyword(s):  
Twist Angle ◽  
Van Der Waals ◽  
Van Der Waals Heterostructures
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