scholarly journals Gate tuning from exciton superfluid to quantum anomalous Hall in van der Waals heterobilayer

2019 ◽  
Vol 5 (1) ◽  
pp. eaau6120 ◽  
Author(s):  
Qizhong Zhu ◽  
Matisse Wei-Yuan Tu ◽  
Qingjun Tong ◽  
Wang Yao
Keyword(s):  
Coulomb Interaction ◽  
Quantum Tunneling ◽  
2D Materials ◽  
Van Der Waals ◽  
Quantum Spin ◽  
Two Dimensional ◽  
Quantum Phases ◽  
Powerful Approach ◽  
Material Systems ◽  
Topological Matter

Van der Waals heterostructures of two-dimensional (2D) materials provide a powerful approach toward engineering various quantum phases of matter. Examples include topological matter such as quantum spin Hall (QSH) insulator and correlated matter such as exciton superfluid. It can be of great interest to realize these vastly different quantum phases matter on a common platform; however, their distinct origins tend to restrict them to material systems of incompatible characters. Here, we show that heterobilayers of 2D valley semiconductors can be tuned through interlayer bias between an exciton superfluid, a quantum anomalous Hall insulator, and a QSH insulator. The tunability between these distinct phases results from the competition of Coulomb interaction with the interlayer quantum tunneling that has a chiral form in valley semiconductors. Our findings point to exciting opportunities for harnessing both protected topological edge channels and bulk superfluidity in an electrically configurable platform.

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.

Two-dimensional topological insulators exfoliated from Na3Bi-like Dirac semimetals

2021 ◽  
Author(s):  
Xiaoqiu Guo ◽  
Ruixin Yu ◽  
Jingwen Jiang ◽  
Zhuang Ma ◽  
Xiuwen Zhang
Keyword(s):  
Physical Properties ◽  
Epitaxial Growth ◽  
Topological Insulators ◽  
2D Materials ◽  
Van Der Waals ◽  
Two Dimensional ◽  
Dirac Semimetals

Topological insulation is widely predicted in two-dimensional (2D) materials realized by epitaxial growth or van der Waals (vdW) exfoliation. Such 2D topological insulators (TI’s) host many interesting physical properties such...

scholarly journals Quantum tunneling in two-dimensional van der Waals heterostructures and devices

2021 ◽  
Author(s):  
Sidi Fan ◽  
Rui Cao ◽  
Lude Wang ◽  
Shan Gao ◽  
Yupeng Zhang ◽  
...  
Keyword(s):  
Quantum Tunneling ◽  
Van Der Waals ◽  
Two Dimensional ◽  
Van Der Waals Heterostructures

scholarly journals Cross-plane transport in a single-molecule two-dimensional van der Waals heterojunction

2020 ◽  
Vol 6 (22) ◽  
pp. eaba6714 ◽  
Author(s):  
Shiqiang Zhao ◽  
Qingqing Wu ◽  
Jiuchan Pi ◽  
Junyang Liu ◽  
Jueting Zheng ◽  
...  
Keyword(s):  
Charge Transport ◽  
Single Molecule ◽  
Density Functional ◽  
Electronic Materials ◽  
2D Materials ◽  
Molecular Layer ◽  
Van Der Waals ◽  
Density Functional Theory Calculations ◽  
Two Dimensional ◽  
Guest Molecules

Two-dimensional van der Waals heterojunctions (2D-vdWHs) stacked from atomically thick 2D materials are predicted to be a diverse class of electronic materials with unique electronic properties. These properties can be further tuned by sandwiching monolayers of planar organic molecules between 2D materials to form molecular 2D-vdWHs (M-2D-vdWHs), in which electricity flows in a cross-plane way from one 2D layer to the other via a single molecular layer. Using a newly developed cross-plane break junction technique, combined with density functional theory calculations, we show that M-2D-vdWHs can be created and that cross-plane charge transport can be tuned by incorporating guest molecules. The M-2D-vdWHs exhibit distinct cross-plane charge transport signatures, which differ from those of molecules undergoing in-plane charge transport.

scholarly journals Emerging Artificial Two-Dimensional van der Waals Heterostructures for Optoelectronics

2020 ◽  
Author(s):  
Hongcheng Ruan ◽  
Yu Huang ◽  
Yuqian Chen ◽  
Fuwei Zhuge
Keyword(s):  
Material Properties ◽  
2D Materials ◽  
Van Der Waals ◽  
Optoelectronic Devices ◽  
Vertical Direction ◽  
Two Dimensional ◽  
Device Application ◽  
Optical Memories ◽  
Optoelectronic Applications ◽  
Transfer Method

Two-dimensional (2D) materials are attracting explosive attention for their intriguing potential in versatile applications, covering optoelectronics, electronics, sensors, etc. An attractive merit of 2D materials is their viable van der Waals (VdW) stacking in artificial sequence, thus forming different atomic arrangements in vertical direction and enabling unprecedented tailoring of material properties and device application. In this chapter, we summarize the latest progress in assembling VdW heterostructures for optoelectronic applications by beginning with the basic pick-transfer method for assembling 2D materials and then discussing the different combination of 2D materials of semiconductor, conductor, and insulator properties for various optoelectronic devices, e.g., photodiode, phototransistors, optical memories, etc.

Tailoring the structural and electronic properties of an SnSe2/MoS2 van der Waals heterostructure with an electric field and the insertion of a graphene sheet

2019 ◽  
Vol 21 (39) ◽  
pp. 22140-22148 ◽  
Author(s):  
Tuan V. Vu ◽  
Nguyen V. Hieu ◽  
Le T. P. Thao ◽  
Nguyen N. Hieu ◽  
Huynh V. Phuc ◽  
...  
Keyword(s):  
Electric Field ◽  
Electronic Properties ◽  
Graphene Sheet ◽  
2D Materials ◽  
Van Der Waals ◽  
Optoelectronic Devices ◽  
Two Dimensional ◽  
Van Der Waals Heterostructure ◽  
Two Dimensional Materials ◽  
Structural And Electronic Properties

van der Waals heterostructures by stacking different two-dimensional materials are being considered as potential materials for nanoelectronic and optoelectronic devices because they can show the most potential advantages of individual 2D materials.

New topological states in HgTe quantum wells from defect patterning

Nanoscale ◽  
2018 ◽  
Vol 10 (33) ◽  
pp. 15462-15467
Author(s):  
Hua-Hua Fu ◽  
Ruqian Wu
Keyword(s):  
Quantum Wells ◽  
2D Materials ◽  
Quantum Spin ◽  
Two Dimensional ◽  
New Methods ◽  
Topological States ◽  
Quantum Spin Hall

To explore new methods for the realization of the quantum spin Hall (QSH) effect in two-dimensional (2D) materials, we have constructed a honeycomb geometry (HG) by etching rows of hexagonal holes in HgTe quantum wells (QWs).

scholarly journals Emerging 2D Materials and Their Van Der Waals Heterostructures

Nanomaterials ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 579 ◽  
Author(s):  
Antonio Di Bartolomeo
Keyword(s):  
Water Splitting ◽  
High Performance ◽  
State Of The Art ◽  
2D Materials ◽  
Van Der Waals ◽  
Functional Materials ◽  
Building Blocks ◽  
Theoretical Research ◽  
Two Dimensional ◽  
Tremendous Amount

Two-dimensional (2D) materials and their van der Waals heterojunctions offer the opportunity to combine layers with different properties as the building blocks to engineer new functional materials for high-performance devices, sensors, and water-splitting photocatalysts. A tremendous amount of work has been done thus far to isolate or synthesize new 2D materials as well as to form new heterostructures and investigate their chemical and physical properties. This article collection covers state-of-the-art experimental, numerical, and theoretical research on 2D materials and on their van der Waals heterojunctions for applications in electronics, optoelectronics, and energy generation.

Two-dimensional van der Waals heterojunctions for functional materials and devices

2017 ◽  
Vol 5 (47) ◽  
pp. 12289-12297 ◽  
Author(s):  
Wei Hu ◽  
Jinlong Yang
Keyword(s):  
Electronic Structures ◽  
2D Materials ◽  
Van Der Waals ◽  
Functional Materials ◽  
Two Dimensional ◽  
Potential Applications

Two-dimensional (2D) van der Waals heterojunctions combining the electronic structures of such 2D materials have been predicted theoretically and synthesized experimentally to expect more new properties and potential applications far beyond corresponding 2D materials.

Prediction of spin–orbital coupling effects on the electronic structure of two dimensional van der Waals heterostructures

2015 ◽  
Vol 17 (46) ◽  
pp. 31253-31259 ◽  
Author(s):  
Baiqing You ◽  
Xiaocha Wang ◽  
Wenbo Mi
Keyword(s):  
Electronic Structure ◽  
First Principles ◽  
2D Materials ◽  
Van Der Waals ◽  
Two Dimensional ◽  
Coupling Effects ◽  
Van Der Waals Heterostructures ◽  
Spin Orbital ◽  
First Principles Study ◽  
Spin Orbital Coupling

We report a first-principles study on the electronic structure of van der Waals (vdW) heterostructures consisting of two dimensional (2D) materials.

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