Two-dimensional valleytronic semiconductor with spontaneous spin and valley polarization in single-layer Cr2Se3

2021 ◽  
Vol 104 (7) ◽  
Author(s):  
Zhonglin He ◽  
Rui Peng ◽  
Xiangyu Feng ◽  
Xilong Xu ◽  
Ying Dai ◽  
...  
Keyword(s):  
Single Layer ◽  
Two Dimensional ◽  
Valley Polarization

Prediction of single-layer TiVI6 as a promising two-dimensional valleytronic semiconductor with spontaneous valley polarization

2020 ◽  
Vol 8 (38) ◽  
pp. 13220-13225
Author(s):  
Wenhui Du ◽  
Yandong Ma ◽  
Rui Peng ◽  
Hao Wang ◽  
Baibiao Huang ◽  
...  
Keyword(s):  
Single Layer ◽  
Two Dimensional ◽  
Valley Polarization

Valley polarization spontaneously occurs in single-layer TiVI6 without any additional tuning.

Large valley polarization in a novel two-dimensional semiconductor H-ZrX2 (X=Cl, Br, I)

2021 ◽  
Author(s):  
Jiatian Guo ◽  
Zhutong Lu ◽  
Keyu Wang ◽  
Xiuwen Zhao ◽  
Gui-Chao Hu ◽  
...  
Keyword(s):  
Single Layer ◽  
Strain Engineering ◽  
Research Field ◽  
Spin Splitting ◽  
Two Dimensional ◽  
First Principles Calculations ◽  
Berry Curvature ◽  
New Class ◽  
Valley Polarization ◽  
Magnetization Orientation

Abstract Inspired by the new progress in the research field of two-dimensional valleytronics materials, we propose a new class of transition metal halides, i.e., H-ZrX2 (X=Cl, Br, I), and investigated their valleytronics properties under the first-principles calculations. It harbors the spin-valley coupling at K and K' points in the top of valence band, in which the valley spin splitting of ZrI2 can reach up to 115 meV. By carrying out the strain engineering, the valley spin splitting and Berry curvature can be effectively tuned. The long-sought valley polarization reaches up to 108 meV by doping Cr atom, which corresponds to the large Zeeman magnetic field of 778T. Furthermore, the valley polarization in ZrX2 can be lineally adjusted or flipped by manipulating the magnetization orientation of the doped magnetic atoms. All the results demonstrate the well-founded application prospects of single-layer ZrX2, which can be considered as great candidate for the development of valleytronics and spintronics.

scholarly journals Homogeneous 2D and 3D alignment of cardiomyocyte in dilated cardiomyopathy revealed by intravital heart imaging

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Kiyoshi Masuyama ◽  
Tomoaki Higo ◽  
Jong-Kook Lee ◽  
Ryohei Matsuura ◽  
Ian Jones ◽  
...  
Keyword(s):  
Heart Failure ◽  
Dilated Cardiomyopathy ◽  
Cardiac Dysfunction ◽  
Three Dimensional ◽  
Single Layer ◽  
Specific Pattern ◽  
Two Dimensional ◽  
Heart Imaging ◽  
Novel Method ◽  
2D And 3D

AbstractIn contrast to hypertrophic cardiomyopathy, there has been reported no specific pattern of cardiomyocyte array in dilated cardiomyopathy (DCM), partially because lack of alignment assessment in a three-dimensional (3D) manner. Here we have established a novel method to evaluate cardiomyocyte alignment in 3D using intravital heart imaging and demonstrated homogeneous alignment in DCM mice. Whilst cardiomyocytes of control mice changed their alignment by every layer in 3D and position twistedly even in a single layer, termed myocyte twist, cardiomyocytes of DCM mice aligned homogeneously both in two-dimensional (2D) and in 3D and lost myocyte twist. Manipulation of cultured cardiomyocyte toward homogeneously aligned increased their contractility, suggesting that homogeneous alignment in DCM mice is due to a sort of alignment remodelling as a way to compensate cardiac dysfunction. Our findings provide the first intravital evidence of cardiomyocyte alignment and will bring new insights into understanding the mechanism of heart failure.

Two-dimensional intrinsic ferrovalley GdI2 with large valley polarization

2021 ◽  
Vol 103 (12) ◽  
Author(s):  
Hai-Xia Cheng ◽  
Jun Zhou ◽  
Wei Ji ◽  
Yan-Ning Zhang ◽  
Yuan-Ping Feng
Keyword(s):  
Two Dimensional ◽  
Valley Polarization

First principles studies on electronic and contact properties of Single layer 2H-MoS2/1T'-MX2 heterojunctions

2022 ◽  
Author(s):  
Jiao Yu ◽  
Caijuan Xia ◽  
Zhengyang Hu ◽  
jianping Sun ◽  
Xiaopeng Hao ◽  
...  
Keyword(s):  
Transition Metal ◽  
First Principles ◽  
Field Effect ◽  
Field Effect Transistors ◽  
Single Layer ◽  
Metal Chalcogenides ◽  
Two Dimensional ◽  
Transition Metal Chalcogenides

With in-plane heterojunction contacts between semiconducting 2H phase (as channel) and the metallic 1T' phase (as electrode), the two-dimensional (2D) transition metal chalcogenides (TMDs) field-effect transistors (FETs) have received much...

Controllable Fabrication and Photocatalytic Performance of Nanoscale Single-layer MoSe2 with Substantial Edges on Ag(111)

Nanoscale ◽  
2021 ◽  
Author(s):  
Jianchen Lu ◽  
Gefei Niu ◽  
Xiao Ren ◽  
De-Liang Bao ◽  
Hui Chen ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Transition Metal ◽  
Photocatalytic Performance ◽  
Transition Metal Dichalcogenides ◽  
Single Layer ◽  
Two Dimensional ◽  
Metal Dichalcogenides ◽  
Controllable Fabrication

Two-dimensional (2D) transition metal dichalcogenides (TMDs) are emerging as new electrocatalysts and photocatalysts, in which edge sites of 2D TMDs are highly catalytic activity and are thus favored at the...

scholarly journals A structure hierarchy for silicate minerals: sheet silicates

2018 ◽  
Vol 83 (1) ◽  
pp. 3-55 ◽  
Author(s):  
Frank C. Hawthorne ◽  
Yulia A. Uvarova ◽  
Elena Sokolova
Keyword(s):  
Double Layer ◽  
Structural Connectivity ◽  
Single Layer ◽  
Common Species ◽  
Two Dimensional ◽  
Structural Units ◽  
Coordination Polyhedra ◽  
Silicate Minerals ◽  
Sheet Silicates ◽  
Sheet Silicate

AbstractThe structure hierarchy hypothesis states that structures may be ordered hierarchically according to the polymerisation of coordination polyhedra of higher bond-valence. A hierarchical structural classification is developed for sheet-silicate minerals based on the connectedness of the two-dimensional polymerisations of (TO4) tetrahedra, where T = Si4+ plus As5+, Al3+, Fe3+, B3+, Be2+, Zn2+ and Mg2+. Two-dimensional nets and oikodoméic operations are used to generate the silicate (sensu lato) structural units of single-layer, double-layer and higher-layer sheet-silicate minerals, and the interstitial complexes (cation identity, coordination number and ligancy, and the types and amounts of interstitial (H2O) groups) are recorded. Key aspects of the silicate structural unit include: (1) the type of plane net on which the sheet (or parent sheet) is based; (2) the u (up) and d (down) directions of the constituent tetrahedra relative to the plane of the sheet; (3) the planar or folded nature of the sheet; (4) the layer multiplicity of the sheet (single, double or higher); and (5) the details of the oikodoméic operations for multiple-layer sheets. Simple 3-connected plane nets (such as 63, 4.82 and 4.6.12) have the stoichiometry (T2O5)n (Si:O = 1:2.5) and are the basis of most of the common rock-forming sheet-silicate minerals as well as many less-common species. Oikodoméic operations, e.g. insertion of 2- or 4-connected vertices into 3-connected plane nets, formation of double-layer sheet-structures by (topological) reflection or rotation operations, affect the connectedness of the resulting sheets and lead to both positive and negative deviations from Si:O = 1:2.5 stoichiometry. Following description of the structural units in all sheet-silicate minerals, the minerals are arranged into decreasing Si:O ratio from 3.0 to 2.0, an arrangement that reflects their increasing structural connectivity. Considering the silicate component of minerals, the range of composition of the sheet silicates completely overlaps the compositional ranges of framework silicates and most of the chain-ribbon-tube silicates.

scholarly journals Stone–Wales defects preserve hyperuniformity in amorphous two-dimensional networks

2021 ◽  
Vol 118 (3) ◽  
pp. e2016862118
Author(s):  
Duyu Chen ◽  
Yu Zheng ◽  
Lei Liu ◽  
Ge Zhang ◽  
Mohan Chen ◽  
...  
Keyword(s):  
2D Materials ◽  
Single Layer ◽  
Salient Feature ◽  
Density Fluctuations ◽  
Wave Number ◽  
Static Structure Factor ◽  
Two Dimensional ◽  
Static Structure ◽  
Topological Transformation ◽  
Amorphous Graphene

Disordered hyperuniformity (DHU) is a recently discovered novel state of many-body systems that possesses vanishing normalized infinite-wavelength density fluctuations similar to a perfect crystal and an amorphous structure like a liquid or glass. Here, we discover a hyperuniformity-preserving topological transformation in two-dimensional (2D) network structures that involves continuous introduction of Stone–Wales (SW) defects. Specifically, the static structure factor S(k) of the resulting defected networks possesses the scaling S(k)∼kα for small wave number k, where 1≤α(p)≤2 monotonically decreases as the SW defect concentration p increases, reaches α≈1 at p≈0.12, and remains almost flat beyond this p. Our findings have important implications for amorphous 2D materials since the SW defects are well known to capture the salient feature of disorder in these materials. Verified by recently synthesized single-layer amorphous graphene, our network models reveal unique electronic transport mechanisms and mechanical behaviors associated with distinct classes of disorder in 2D materials.

scholarly journals Graphene-Based Nanosystems: Versatile Nanotools for Theranostics and Bioremediation

2021 ◽  
Author(s):  
Marlene Lúcio ◽  
Eduarda Fernandes ◽  
Hugo Gonçalves ◽  
Sofia Machado ◽  
Andreia C. Gomes ◽  
...  
Keyword(s):  
Biomedical Applications ◽  
Quantum Physics ◽  
Single Layer ◽  
The Body ◽  
Diagnostic Tools ◽  
Honeycomb Lattice ◽  
Two Dimensional ◽  
Advantages And Disadvantages ◽  
Broad Variety ◽  
Imaging Strategy

Since its revolutionary discovery in 2004, graphene— a two-dimensional (2D) nanomaterial consisting of single-layer carbon atoms packed in a honeycomb lattice— was thoroughly discussed for a broad variety of applications including quantum physics, nanoelectronics, energy efficiency, and catalysis. Graphene and graphene-based nanomaterials (GBNs) have also captivated the interest of researchers for innovative biomedical applications since the first publication on the use of graphene as a nanocarrier for the delivery of anticancer drugs in 2008. Today, GBNs have evolved into hybrid combinations of graphene and other elements (e.g., drugs or other bioactive compounds, polymers, lipids, and nanoparticles). In the context of developing theranostic (therapeutic + diagnostic) tools, which combine multiple therapies with imaging strategies to track the distribution of therapeutic agents in the body, the multipurpose character of the GBNs hybrid systems has been further explored. Because each therapy and imaging strategy has inherent advantages and disadvantages, a mixture of complementary strategies is interesting as it will result in a synergistic theranostic effect. The flexibility of GBNs cannot be limited to their biomedical applications and, these nanosystems emerge as a viable choice for an indirect effect on health by their future use as environmental cleaners. Indeed, GBNs can be used in bioremediation approaches alone or combined with other techniques such as phytoremediation. In summary, without ignoring the difficulties that GBNs still present before being deemed translatable to clinical and environmental applications, the purpose of this chapter is to provide an overview of the remarkable potential of GBNs on health by presenting examples of their versatility as nanotools for theranostics and bioremediation.

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