scholarly journals Valleytronics in Two-dimensional Materials

2020 ◽  
Vol 29 (6) ◽  
pp. 28-32
Author(s):  
Hyejin RYU
Keyword(s):  
Data Storage ◽  
Degrees Of Freedom ◽  
Degree Of Freedom ◽  
Two Dimensional ◽  
Spintronic Devices ◽  
Additional Control ◽  
Two Dimensional Materials ◽  
Potential Applications ◽  
New Type ◽  
Efficient Information

A new type of degree of freedom in terms of valley symmetry has recently emerged, allowing an additional control, in addition to the traditional controls of the charge and the spin degrees of freedom, which are widely used in transistors and in spintronic devices, respectively. Valleytronics is a new type of electronics having great potential for faster and more efficient information processing and for high-density data storage in next-generation devices. Two-dimensional materials are considered to be ideal systems for investigating valleytronics due to many systems having two distinguishable valleys of opposite spin textures. In this article, we demonstrate the fundamental properties related to the valley degree of freedom in two-dimensional materials and its potential applications for valleytronic devices.

scholarly journals Tip-Based Nanomachining on Thin Films: A Mini Review

2021 ◽  
Author(s):  
Shunyu Chang ◽  
Yanquan Geng ◽  
Yongda Yan
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Data Storage ◽  
Three Dimensional ◽  
Maintenance Cost ◽  
Two Dimensional ◽  
Force Microscopy ◽  
Atomic Force ◽  
Current State ◽  
Two Dimensional Materials

AbstractAs one of the most widely used nanofabrication methods, the atomic force microscopy (AFM) tip-based nanomachining technique offers important advantages, including nanoscale manipulation accuracy, low maintenance cost, and flexible experimental operation. This technique has been applied to one-, two-, and even three-dimensional nanomachining patterns on thin films made of polymers, metals, and two-dimensional materials. These structures are widely used in the fields of nanooptics, nanoelectronics, data storage, super lubrication, and so forth. Moreover, they are believed to have a wide application in other fields, and their possible industrialization may be realized in the future. In this work, the current state of the research into the use of the AFM tip-based nanomachining method in thin-film machining is presented. First, the state of the structures machined on thin films is reviewed according to the type of thin-film materials (i.e., polymers, metals, and two-dimensional materials). Second, the related applications of tip-based nanomachining to film machining are presented. Finally, the current situation of this area and its potential development direction are discussed. This review is expected to enrich the understanding of the research status of the use of the tip-based nanomachining method in thin-film machining and ultimately broaden its application.

Strong coupling in two-dimensional materials-based nanostructures: a review

2022 ◽  
Author(s):  
Ye Ming Qing ◽  
Yongze Ren ◽  
Dangyuan Lei ◽  
Hui Feng Ma ◽  
Tie Jun Cui
Keyword(s):  
Strong Coupling ◽  
Coupling Effect ◽  
Transition Metal Dichalcogenides ◽  
Hybrid Nanostructures ◽  
Two Dimensional ◽  
Strong Light ◽  
Two Dimensional Materials ◽  
Potential Applications ◽  
Metal Dichalcogenides ◽  
Emission Behavior

Abstract Strong interaction between electromagnetic radiation and matter leads to the formation of hybrid light-matter states, making the absorption and emission behavior different from those of the uncoupled states. Strong coupling effect results in the famous Rabi splitting and the emergence of new polaritonic eigenmodes, exhibiting spectral anticrossing behavior and unique energy-transfer properties. In recent years, there has been a rapidly increasing number of works focusing on strong coupling between nanostructures and two-dimensional materials (2DMs), because of the exceptional properties and applications they demonstrate. Here, we review the significant recent advances and important developments of strong light-matter interactions in 2DMs-based nanostructures. We adopt the coupled oscillator model to describe the strong coupling and give an overview of various hybrid nanostructures to realize this regime, including graphene-based nanostructures, black phosphorus-based nanostructures, transition-metal dichalcogenides-based nanostructures, etc. In addition, we discuss potential applications that can benefit from these effects and conclude our review with a perspective on the future of this rapidly emerging field.

scholarly journals Layer-dependent quantum cooperation of electron and hole states in the anomalous semimetal WTe2

2016 ◽  
Vol 7 (1) ◽  
Author(s):  
Pranab Kumar Das ◽  
D. Di Sante ◽  
I. Vobornik ◽  
J. Fujii ◽  
T. Okuda ◽  
...  
Keyword(s):  
Degrees Of Freedom ◽  
Transition Metal Dichalcogenides ◽  
Photoemission Spectroscopy ◽  
Two Dimensional ◽  
Quantum Phenomenon ◽  
Two Dimensional Materials ◽  
Metal Dichalcogenides ◽  
Electron And Hole States ◽  
Dependent Behaviour

Abstract The behaviour of electrons and holes in a crystal lattice is a fundamental quantum phenomenon, accounting for a rich variety of material properties. Boosted by the remarkable electronic and physical properties of two-dimensional materials such as graphene and topological insulators, transition metal dichalcogenides have recently received renewed attention. In this context, the anomalous bulk properties of semimetallic WTe2 have attracted considerable interest. Here we report angle- and spin-resolved photoemission spectroscopy of WTe2 single crystals, through which we disentangle the role of W and Te atoms in the formation of the band structure and identify the interplay of charge, spin and orbital degrees of freedom. Supported by first-principles calculations and high-resolution surface topography, we reveal the existence of a layer-dependent behaviour. The balance of electron and hole states is found only when considering at least three Te–W–Te layers, showing that the behaviour of WTe2 is not strictly two dimensional.

Novel Deployable Mechanisms With Decoupled Degrees-of-Freedom

2015 ◽  
Vol 8 (2) ◽  
Author(s):  
Shengnan Lu ◽  
Dimiter Zlatanov ◽  
Xilun Ding ◽  
Rezia Molfino ◽  
Matteo Zoppi
Keyword(s):  
Degrees Of Freedom ◽  
Singularity Analysis ◽  
Degree Of Freedom ◽  
Three Dimensions ◽  
Potential Applications ◽  
Magnification Ratio ◽  
The Relationship ◽  
Kinematic Properties ◽  
Kinematic Simulations

A novel family of deployable mechanisms (DMs) is presented. Unlike most such devices, which have one degree-of-freedom (DOF), the proposed DM can be deployed and compacted independently in two or three directions. This widens the range of its potential applications, including flexible industrial fixtures and deployable tents. The mechanism's basic deployable unit (DU) is assembled by combining a scissor linkage and a Sarrus linkage. The kinematic properties of these two components and of the combined unit are analyzed. The conditions under which the unit can be maximally compacted and deployed are determined through singularity analysis. New 2DOF DMs are obtained by linking the DUs: each mechanism's shape can be modified in two directions. The relationship between the degree of overconstraint and the number of DUs is derived. The magnification ratio is calculated as a function of link thickness and the number of DUs. The idea of deployment in independent directions is then extended to three dimensions with a family of 3DOF mechanisms. Finally, kinematic simulations are performed to validate the proposed designs and analyses.

scholarly journals Two-dimensional penta-Sn3H2 monolayer for nanoelectronics and photocatalytic water splitting: a first-principles study

RSC Advances ◽  
2018 ◽  
Vol 8 (21) ◽  
pp. 11799-11806 ◽  
Author(s):  
Peng Zhang ◽  
Xibin Yang ◽  
Wei Wu ◽  
Lifen Tian ◽  
Daxi Xiong ◽  
...  
Keyword(s):  
Water Splitting ◽  
First Principles ◽  
Two Dimensional ◽  
Photocatalytic Water Splitting ◽  
First Principles Study ◽  
Two Dimensional Materials ◽  
Potential Applications

Exploring two-dimensional materials with novel properties is becoming particularly important due to their potential applications in future electronics and optoelectronics.

Spin-Constraint Optoelectronic Functionality in Two-Dimensional Ferromagnetic Semiconductor Heterojunctions

2021 ◽  
Author(s):  
Yilv Guo ◽  
Yehui Zhang ◽  
Zhaobo Zhou ◽  
Xiwen Zhang ◽  
Bing Wang ◽  
...  
Keyword(s):  
Van Der Waals ◽  
Optoelectronic Devices ◽  
New Physics ◽  
Ferromagnetic Semiconductor ◽  
Two Dimensional ◽  
Potential Applications ◽  
New Type ◽  
Semiconductor Heterojunctions

Two-dimensional (2D) van der Waals (vdW) engineering has brought about many extraordinary new physics and potential applications. Herein, we propose a new type of spin-constraint optoelectronic devices, implemented in 2D...

scholarly journals First-principles study of magnetism in some novel MXene materials

RSC Advances ◽  
2020 ◽  
Vol 10 (72) ◽  
pp. 44430-44436
Author(s):  
Kan Luo ◽  
Xian-Hu Zha ◽  
Qing Huang ◽  
Cheng-Te Lin ◽  
Minghui Yang ◽  
...  
Keyword(s):  
Monte Carlo ◽  
Critical Temperature ◽  
Monte Carlo Simulations ◽  
First Principles ◽  
Two Dimensional ◽  
Spintronic Devices ◽  
First Principles Study ◽  
Two Dimensional Materials

Magnetic two-dimensional materials have gained considerable attention due to their special topologies and promising applications in electronic and spintronic devices, and the critical temperature could be evaluated through Monte Carlo simulations.

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