scholarly journals Measuring the Local Twist Angle and Layer Arrangement in Van der Waals Heterostructures

2018 ◽  
Vol 255 (12) ◽  
pp. 1800191 ◽  
Author(s):  
Tobias A. de Jong ◽  
Johannes Jobst ◽  
Hyobin Yoo ◽  
Eugene E. Krasovskii ◽  
Philip Kim ◽  
...  
Keyword(s):  
Twist Angle ◽  
Van Der Waals ◽  
Van Der Waals Heterostructures ◽  
Layer Arrangement

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.

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

scholarly journals Stacking-Dependent Optical Properties in Bilayer WSe2

Nanoscale ◽  
2021 ◽  
Author(s):  
Kathleen M. McCreary ◽  
Madeleine Phillips ◽  
Hsun-Jen Chuang ◽  
Darshana Wickramaratne ◽  
Matthew Rosenberger ◽  
...  
Keyword(s):  
Optical Properties ◽  
Material Properties ◽  
Twist Angle ◽  
Van Der Waals ◽  
Degree Of Freedom ◽  
Van Der Waals Heterostructures

The twist angle between the monolayers in van der Waals heterostructures provides a new degree of freedom in tuning material properties. We compare the optical properties of WSe2 homobilayers with...

scholarly journals Twist Angle-Dependent Interlayer Exciton Lifetimes in van der Waals Heterostructures

2021 ◽  
Vol 126 (4) ◽  
Author(s):  
Junho Choi ◽  
Matthias Florian ◽  
Alexander Steinhoff ◽  
Daniel Erben ◽  
Kha Tran ◽  
...  
Keyword(s):  
Twist Angle ◽  
Van Der Waals ◽  
Van Der Waals Heterostructures

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

ACS Nano ◽  
2017 ◽  
Vol 11 (9) ◽  
pp. 9566-9566 ◽  
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

scholarly journals Moiré potential impedes interlayer exciton diffusion in van der Waals heterostructures

2020 ◽  
Vol 6 (39) ◽  
pp. eaba8866 ◽  
Author(s):  
Junho Choi ◽  
Wei-Ting Hsu ◽  
Li-Syuan Lu ◽  
Liuyang Sun ◽  
Hui-Yu Cheng ◽  
...  
Keyword(s):  
Energy Transport ◽  
Twist Angle ◽  
Van Der Waals ◽  
Transition Metal Dichalcogenides ◽  
Chemical Vapor ◽  
Van Der Waals Heterostructures ◽  
Exciton Diffusion ◽  
Rich Variety ◽  
Metal Dichalcogenides ◽  
The Rich

The properties of van der Waals heterostructures are drastically altered by a tunable moiré superlattice arising from periodically varying atomic alignment between the layers. Exciton diffusion represents an important channel of energy transport in transition metal dichalcogenides (TMDs). While early studies performed on TMD heterobilayers suggested that carriers and excitons exhibit long diffusion, a rich variety of scenarios can exist. In a moiré crystal with a large supercell and deep potential, interlayer excitons may be completely localized. As the moiré period reduces at a larger twist angle, excitons can tunnel between supercells and diffuse over a longer lifetime. The diffusion should be the longest in commensurate heterostructures where the moiré superlattice is completely absent. Here, we experimentally demonstrate the rich phenomena of interlayer exciton diffusion in WSe2/MoSe2 heterostructures by comparing several samples prepared with chemical vapor deposition and mechanical stacking with accurately controlled twist angles.

scholarly journals In situ manipulation of van der Waals heterostructures for twistronics

2020 ◽  
Vol 6 (49) ◽  
pp. eabd3655
Author(s):  
Yaping Yang ◽  
Jidong Li ◽  
Jun Yin ◽  
Shuigang Xu ◽  
Ciaran Mullan ◽  
...  
Keyword(s):  
Boron Nitride ◽  
Hexagonal Boron Nitride ◽  
2D Materials ◽  
Twist Angle ◽  
Van Der Waals ◽  
Two Dimensional ◽  
Van Der Waals Heterostructures ◽  
Material Systems ◽  
Nontrivial Topology

In van der Waals heterostructures, electronic bands of two-dimensional (2D) materials, their nontrivial topology, and electron-electron interactions can be markedly changed by a moiré pattern induced by twist angles between different layers. This process is referred to as twistronics, where the tuning of twist angle can be realized through mechanical manipulation of 2D materials. Here, we demonstrate an experimental technique that can achieve in situ dynamical rotation and manipulation of 2D materials in van der Waals heterostructures. Using this technique, we fabricated heterostructures where graphene is perfectly aligned with both top and bottom encapsulating layers of hexagonal boron nitride. Our technique enables twisted 2D material systems in one single stack with dynamically tunable optical, mechanical, and electronic properties.

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