Strain-tunable electric structure and magnetic anisotropy in monolayer CrSI

2019 ◽  
Vol 21 (37) ◽  
pp. 20892-20900 ◽  
Author(s):  
Ruilin Han ◽  
Yu Yan
Keyword(s):  
Magnetic Anisotropy ◽  
Ferromagnetic Semiconductors ◽  
Two Dimensional ◽  
Electric Structure ◽  
Low Dimensional ◽  
Physical Phenomena ◽  
Low Dimensional Materials

Two-dimensional (2D) ferromagnetic semiconductors provide platforms for studying novel physical phenomena in low dimensional materials.

Enhanced magnetic anisotropy and Curie temperature of the NiI2 monolayer by applying strain: a first-principles study

2020 ◽  
Vol 22 (46) ◽  
pp. 26917-26922
Author(s):  
Hecheng Han ◽  
Huiling Zheng ◽  
Qiushi Wang ◽  
Yu Yan
Keyword(s):  
Curie Temperature ◽  
Magnetic Anisotropy ◽  
First Principles ◽  
Ferromagnetic Semiconductors ◽  
Two Dimensional ◽  
First Principles Study ◽  
Low Dimensional

Two-dimensional (2D) intrinsic ferromagnetic semiconductors with high magnetic anisotropy (MA) and Curie temperature (TC) are desirable for low-dimensional spintronic applications.

scholarly journals Layer-dependent topological phase in a two-dimensional quasicrystal and approximant

2020 ◽  
Vol 117 (42) ◽  
pp. 26135-26140
Author(s):  
Jeffrey D. Cain ◽  
Amin Azizi ◽  
Matthias Conrad ◽  
Sinéad M. Griffin ◽  
Alex Zettl
Keyword(s):  
Density Functional ◽  
Density Functional Theory Calculations ◽  
Transition Metal Dichalcogenide ◽  
Material System ◽  
Two Dimensional ◽  
Topological Properties ◽  
Scanning Transmission ◽  
Layered Transition Metal ◽  
Low Dimensional ◽  
Physical Phenomena

The electronic and topological properties of materials are derived from the interplay between crystalline symmetry and dimensionality. Simultaneously introducing “forbidden” symmetries via quasiperiodic ordering with low dimensionality into a material system promises the emergence of new physical phenomena. Here, we isolate a two-dimensional (2D) chalcogenide quasicrystal and approximant, and investigate their electronic and topological properties. The 2D layers of the materials with a composition close to Ta1.6Te, derived from a layered transition metal dichalcogenide, are isolated with standard exfoliation techniques, and investigated with electron diffraction and atomic resolution scanning transmission electron microscopy. Density functional theory calculations and symmetry analysis of the large unit cell crystalline approximant of the quasicrystal, Ta21Te13, reveal the presence of symmetry-protected nodal crossings in the quasicrystalline and approximant phases, whose presence is tunable by layer number. Our study provides a platform for the exploration of physics in quasicrystalline, low-dimensional materials and the interconnected nature of topology, dimensionality, and symmetry in electronic systems.

Recent advances in two-dimensional-material-based sensing technology toward health and environmental monitoring applications

Nanoscale ◽  
2020 ◽  
Vol 12 (6) ◽  
pp. 3535-3559 ◽  
Author(s):  
Deepika Tyagi ◽  
Huide Wang ◽  
Weichun Huang ◽  
Lanping Hu ◽  
Yanfeng Tang ◽  
...  
Keyword(s):  
Environmental Monitoring ◽  
Human Body ◽  
Two Dimensional ◽  
Detection Strategy ◽  
Recent Advances ◽  
Sensing Technology ◽  
Monitoring Applications ◽  
Low Dimensional ◽  
Low Dimensional Materials

Low dimensional materials based sensors have improved the detection strategy for sensing complex substances present in environment and human body.

Mechanisms of high-Tc superconductivity in low-dimensional materials

1987 ◽  
Vol 2 (6) ◽  
pp. 793-799 ◽  
Author(s):  
Vladimir Z. Kresin
Keyword(s):  
Proximity Effect ◽  
Coherence Length ◽  
Two Dimensional ◽  
Phonon Coupling ◽  
Strong Electron ◽  
High Tc ◽  
Electron Phonon Coupling ◽  
Low Dimensionality ◽  
Low Dimensional ◽  
Low Dimensional Materials

High-Tc superconductivity is due to the action of two mechanisms: (1) plasmon mechanism, i.e., exchange of two-dimensional (2-D) plasmons and (2) strong electron-phonon coupling. The low dimensionality and the small value of the carrier concentration make the plasmon mechanism favorable. The small value of the coherence length leads to a unique opportunity to observe a multigap structure. The proximity effect can be used in order to increase Tc of A-15 compounds.

scholarly journals Materials nanoarchitectonics at two-dimensional liquid interfaces

2019 ◽  
Vol 10 ◽  
pp. 1559-1587 ◽  
Author(s):  
Katsuhiko Ariga ◽  
Michio Matsumoto ◽  
Taizo Mori ◽  
Lok Kumar Shrestha
Keyword(s):  
Metal Organic Frameworks ◽  
Layer By Layer ◽  
Two Dimensional ◽  
Covalent Organic Frameworks ◽  
Liquid Interfaces ◽  
Langmuir Blodgett ◽  
Enzyme Reactors ◽  
Metal Organic ◽  
Low Dimensional ◽  
Low Dimensional Materials

Much attention has been paid to the synthesis of low-dimensional materials from small units such as functional molecules. Bottom-up approaches to create new low-dimensional materials with various functional units can be realized with the emerging concept of nanoarchitectonics. In this review article, we overview recent research progresses on materials nanoarchitectonics at two-dimensional liquid interfaces, which are dimensionally restricted media with some freedoms of molecular motion. Specific characteristics of molecular interactions and functions at liquid interfaces are briefly explained in the first parts. The following sections overview several topics on materials nanoarchitectonics at liquid interfaces, such as the preparation of two-dimensional metal-organic frameworks and covalent organic frameworks, and the fabrication of low-dimensional and specifically structured nanocarbons and their assemblies at liquid–liquid interfaces. Finally, interfacial nanoarchitectonics of biomaterials including the regulation of orientation and differentiation of living cells are explained. In the recent examples described in this review, various materials such as molecular machines, molecular receptors, block-copolymer, DNA origami, nanocarbon, phages, and stem cells were assembled at liquid interfaces by using various useful techniques. This review overviews techniques such as conventional Langmuir–Blodgett method, vortex Langmuir–Blodgett method, liquid–liquid interfacial precipitation, instructed assembly, and layer-by-layer assembly to give low-dimensional materials including nanowires, nanowhiskers, nanosheets, cubic objects, molecular patterns, supramolecular polymers, metal-organic frameworks and covalent organic frameworks. The nanoarchitecture materials can be used for various applications such as molecular recognition, sensors, photodetectors, supercapacitors, supramolecular differentiation, enzyme reactors, cell differentiation control, and hemodialysis.

Temperature gradient-driven motion and assembly of two-dimensional (2D) materials on the liquid surface: a theoretical framework and molecular dynamics simulation

2020 ◽  
Vol 22 (41) ◽  
pp. 24097-24108
Author(s):  
Yongshuai Wen ◽  
Qingchang Liu ◽  
Yongshou Liu
Keyword(s):  
Molecular Dynamics ◽  
Molecular Dynamics Simulation ◽  
Temperature Gradient ◽  
Conceptual Design ◽  
Liquid Surface ◽  
2D Materials ◽  
Dynamics Simulation ◽  
Two Dimensional ◽  
Low Dimensional ◽  
Low Dimensional Materials

A conceptual design of driving 2D or other low-dimensional materials on the liquid surface with a temperature gradient.

Confinement Effect in Thermoelectric Properties of Two-Dimensional Materials

MRS Advances ◽  
2020 ◽  
Vol 5 (10) ◽  
pp. 469-479 ◽  
Author(s):  
Nguyen T. Hung ◽  
Ahmad R. T. Nugraha ◽  
Teng Yang ◽  
Riichiro Saito
Keyword(s):  
2D Materials ◽  
Quantum Effect ◽  
Electrical Energy ◽  
Confinement Effect ◽  
Fundamental Aspect ◽  
Two Dimensional ◽  
Low Dimensions ◽  
Low Dimensional ◽  
De Broglie Wavelength ◽  
Low Dimensional Materials

ABSTRACT:Thermoelectric (TE) materials, or materials that can generate an electrical energy from temperature gradient, are promising for renewable energy technology. One fundamental aspect in the TE research is the demand to maximize the TE power-factor, PF = S2 σ, by having as large Seebeck coefficient (S) and electrical conductivity (σ) as possible. In the early 90s, Hicks and Dresselhaus proposed the PF enhancement by using low-dimensional materials, in which electrons are confined in certain directions and they move freely in the other directions. This quantum effect is known as the confinement length (L) effect, in which L is the thickness or diameter of the two-dimensional (2D) or one-dimensional materials, respectively. However, a key challenge is to understand the critical value of L, at which the PF can be significantly enhanced. Recently, we reevaluated the confinement theory of the low-dimensional materials to solve this issue. We showed that electrons are fully confined only when L is smaller than an intrinsic length Λ, the so-called thermal de Broglie wavelength, which depends on the materials and can be experimentally measured. Monolayer 2D materials naturally satisfy the condition of L < Λ since their confinement length is ∼ 1 nm, while their thermal de Broglie wavelength is ∼ 5-10 nm. Therefore, they could be a good candidate for TE materials. In this review article, we first review the TE materials with low dimensions. Then, we show the basic concept of the confinement effect and the consequence of such an effect. Finally, based on this effect, we turn our attention to the progress achieved recently in the TE properties of the 2D materials such as monolayer InSe, GaN electron gas, and SrTiO3 superlattices.

scholarly journals Controlling the anisotropy of a van der Waals antiferromagnet with light

2021 ◽  
Vol 7 (23) ◽  
pp. eabf3096
Author(s):  
Dmytro Afanasiev ◽  
Jorrit R. Hortensius ◽  
Mattias Matthiesen ◽  
Samuel Mañas-Valero ◽  
Makars Šiškins ◽  
...  
Keyword(s):  
Magnetic Anisotropy ◽  
Long Range ◽  
Van Der Waals ◽  
Ultrashort Pulses ◽  
Anisotropy Axis ◽  
Two Dimensional ◽  
Orbital Symmetry ◽  
Nickel Ions ◽  
Long Range Correlations ◽  
Low Dimensional

Van der Waals magnets provide an ideal playground to explore the fundamentals of low-dimensional magnetism and open opportunities for ultrathin spin-processing devices. The Mermin-Wagner theorem dictates that as in reduced dimensions isotropic spin interactions cannot retain long-range correlations, the long-range spin order is stabilized by magnetic anisotropy. Here, using ultrashort pulses of light, we control magnetic anisotropy in the two-dimensional van der Waals antiferromagnet NiPS3. Tuning the photon energy in resonance with an orbital transition between crystal field split levels of the nickel ions, we demonstrate the selective activation of a subterahertz magnon mode with markedly two-dimensional behavior. The pump polarization control of the magnon amplitude confirms that the activation is governed by the photoinduced magnetic anisotropy axis emerging in response to photoexcitation of ground state electrons to states with a lower orbital symmetry. Our results establish pumping of orbital resonances as a promising route for manipulating magnetic order in low-dimensional (anti)ferromagnets.

scholarly journals Current-driven magnetization switching in a van der Waals ferromagnet Fe3GeTe2

2019 ◽  
Vol 5 (8) ◽  
pp. eaaw8904 ◽  
Author(s):  
Xiao Wang ◽  
Jian Tang ◽  
Xiuxin Xia ◽  
Congli He ◽  
Junwei Zhang ◽  
...  
Keyword(s):  
Magnetic Fields ◽  
Van Der Waals ◽  
The Other ◽  
Bilayer Structure ◽  
Spin Orbit ◽  
Two Dimensional ◽  
Magnetization Switching ◽  
Spintronic Devices ◽  
Low Dimensional ◽  
Low Dimensional Materials

The recent discovery of ferromagnetism in two-dimensional (2D) van der Waals (vdW) materials holds promises for spintronic devices with exceptional properties. However, to use 2D vdW magnets for building spintronic nanodevices such as magnetic memories, key challenges remain in terms of effectively switching the magnetization from one state to the other electrically. Here, we devise a bilayer structure of Fe3GeTe2/Pt, in which the magnetization of few-layered Fe3GeTe2 can be effectively switched by the spin-orbit torques (SOTs) originated from the current flowing in the Pt layer. The effective magnetic fields corresponding to the SOTs are further quantitatively characterized using harmonic measurements. Our demonstration of the SOT-driven magnetization switching in a 2D vdW magnet could pave the way for implementing low-dimensional materials in the next-generation spintronic applications.

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