scholarly journals Self-similar transport, spin polarization and thermoelectricity in complex silicene structures

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
R. Rodríguez-González ◽  
L. M. Gaggero-Sager ◽  
I. Rodríguez-Vargas
Keyword(s):  
Physical Properties ◽  
Spin Polarization ◽  
Structural Parameters ◽  
Transition Metal Dichalcogenides ◽  
Monolayer Graphene ◽  
Complex Geometries ◽  
2D Material ◽  
Metal Dichalcogenides ◽  
Self Similar ◽  
Mott Formula

Abstract 2D materials open the possibility to study Dirac electrons in complex self-similar geometries. The two-dimensional nature of materials like graphene, silicene, phosphorene and transition-metal dichalcogenides allow the nanostructuration of complex geometries through metallic electrodes, interacting substrates, strain, etc. So far, the only 2D material that presents physical properties that directly reflect the characteristics of the complex geometries is monolayer graphene. In the present work, we show that silicene nanostructured in complex fashion also displays self-similar characteristics in physical properties. In particular, we find self-similar patterns in the conductance, spin polarization and thermoelectricity of Cantor-like silicene structures. These complex structures are generated by modulating electrostatically the silicene local bandgap in Cantor-like fashion along the structure. The charge carriers are described quantum relativistically by means of a Dirac-like Hamiltonian. The transfer matrix method, the Landauer–Büttiker formalism and the Cutler–Mott formula are used to obtain the transmission, transport and thermoelectric properties. We numerically derive scaling rules that connect appropriately the self-similar conductance, spin polarization and Seebeck coefficient patterns. The scaling rules are related to the structural parameters that define the Cantor-like structure such as the generation and length of the system as well as the height of the potential barriers. As far as we know this is the first time that a 2D material beyond monolayer graphene shows self-similar quantum transport as well as that transport related properties like spin polarization and thermoelectricity manifest self-similarity.

THE ELECTRONIC STRUCTURE AT ORGANIC–2D MATERIAL HETEROINTERFACES

2021 ◽  
pp. 2140003
Author(s):  
YU LI HUANG ◽  
ANDREW THYE SHEN WEE
Keyword(s):  
Charge Transfer ◽  
Electronic Structures ◽  
Transition Metal Dichalcogenides ◽  
2D Material ◽  
Physical Mechanisms ◽  
Wide Range ◽  
Fundamental Understanding ◽  
Potential Applications ◽  
Metal Dichalcogenides ◽  
Interfacial Charge

Organic–2D material heterostructures have attracted intensive research interest due to their intriguing properties, with a wide range of potential applications in multifunctional flexible electronic and optoelectronic devices. Central to the realization of such devices is a fundamental understanding of the electronic structures at organic–2D material heterointerfaces. The energy level alignment (ELA) at the interface is of paramount importance because it determines the charge transfer barriers between the two materials in contact. In this paper, we discuss the physical mechanisms determining the ELAs, with special attention on interfacial charge transfer at the heterostructures. We review the current understanding of electronic properties at the heterointerfaces formed by the integration of organics with graphene and 2D transition metal dichalcogenides (TMDs), and conclude with a perspective on the future development of organic–2D material heterostructure.

Strain-driven Phase Transition and Spin Polarization of Re-doped Transition-Metal Dichalcogenides

2021 ◽  
Author(s):  
Ruining Wang ◽  
Chen-Dong Jin ◽  
Hu Zhang ◽  
Ru-Qian Lian ◽  
Xingqiang Shi ◽  
...  
Keyword(s):  
Phase Transition ◽  
Magnetic Properties ◽  
Transition Metal ◽  
Spin Polarization ◽  
Transition Metal Dichalcogenides ◽  
Spin Orbit Coupling ◽  
Spin Orbit ◽  
Two Dimensional ◽  
Energy Landscapes ◽  
Metal Dichalcogenides

Two-dimensional transition metal dichalcogenides (TMDCs) are promising in spintronics due to their spin-orbit coupling, but the intrinsic non-magnetic properties limit their further developments. Here, we focus on the energy landscapes...

scholarly journals A Perspective on the Application of Spatially Resolved ARPES for 2D Materials

2018 ◽  
Author(s):  
Mattia Cattelan ◽  
Neil Fox
Keyword(s):  
Electronic Band Structure ◽  
2D Materials ◽  
Transition Metal Dichalcogenides ◽  
Electronic Band ◽  
Preparation Methods ◽  
2D Material ◽  
Angle Resolved Photoemission Spectroscopy ◽  
Spatially Resolved ◽  
Metal Dichalcogenides ◽  
Future Direction

In this paper a perspective on the application of spatially- and Angle- Resolved PhotoEmission Spectroscopy (ARPES) for the study of two-dimensional (2D) materials is presented. ARPES allows the direct measurement of the electronic band structure of materials generating extremely useful insights into their electronic properties. The possibility to apply this technique to 2D materials is of paramount importance because these ultrathin layers are considered fundamental for future electronic, photonic and spintronic devices. In this review an overview of the technical aspects of spatially localized ARPES is given along with a description of the most advanced setups for laboratory and synchrotron-based equipment. This technique is sensitive to the lateral dimensions of the sample, therefore a discussion on the preparation methods of 2D material is presented. Some of the most interesting results obtained by ARPES are reported in three sections including: graphene, transition metal dichalcogenides (TMDCs) and 2D heterostructures. Graphene has played a key role in ARPES studies because it inspired the use of this technique with other 2D materials. TMDCs are presented for their peculiar transport, optical and spin properties. Finally, the section featuring heterostructures highlights a future direction for research into 2D material structures.

First principle studies on the structures, electronic properties and Raman spectrums of monolayer WX2 (X = S, Se, Te) under strain condition

2021 ◽  
pp. 2150135
Author(s):  
Shan Huang ◽  
Yanping Wang ◽  
Yawen Fan ◽  
Jinjiao Feng ◽  
Hui Zhao ◽  
...  
Keyword(s):  
Physical Properties ◽  
Electronic Properties ◽  
Density Functional ◽  
Tensile Strain ◽  
Phonon Dispersion ◽  
Compressive Strain ◽  
Transition Metal Dichalcogenides ◽  
Structural Instability ◽  
Metal Dichalcogenides ◽  
Different Strains

The two-dimensional transition-metal dichalcogenides (2D TMDs) WX2 (S, Se, Te) have received extensive attention and research since they have excellent physical properties and have been widely used in the fields of photoelectronics. Monolayer (ML) WX2 has excellent physical properties and can be modified by simple strain. Using the first principles based on density functional theory (DFT), this paper mainly studies the electronic properties of ML WS2, WSe2 and Wte2. We also study the stabilities of three ML structures, the changes of Raman spectra and the movement of Raman peaks under biaxial tensile and compressive strains. Under the control of strain not only does the bandgap changes, but also the band properties shift between the direct bandgap and the indirect bandgap. With the increase of strain, bond length and bond angle change in the opposite trend. At the same time, we also studied the phonon dispersion relations of WX2 under different strains. We found that three structures showed good thermodynamic stabilities under the tensile strain (1–10%). When the compressive strain is 2%, one of the acoustic modes of WS2 or Wse2 becomes imaginary at [Formula: see text] point, which indicates the structural instability. When tensile strain Raman summit blueshifts and when compressive strains, the redshift occurs.

scholarly journals Tuning the physical properties of ultrathin transition-metal dichalcogenides via strain engineering

RSC Advances ◽  
2020 ◽  
Vol 10 (65) ◽  
pp. 39455-39467
Author(s):  
Yalan Yan ◽  
Shuang Ding ◽  
Xiaonan Wu ◽  
Jian Zhu ◽  
Dengman Feng ◽  
...  
Keyword(s):  
Transition Metal ◽  
Physical Properties ◽  
2D Materials ◽  
Transition Metal Dichalcogenides ◽  
Strain Engineering ◽  
Two Dimensional ◽  
Photoelectric Properties ◽  
Metal Dichalcogenides

Transition-metal dichalcogenides (TMDs) have become one of the recent frontiers and focuses in two-dimensional (2D) materials fields thanks to their superior electronic, optical, and photoelectric properties.

Fabry-Perot Cavity Enhanced Three-photon Luminescence of Atomically Thin Platinum Diselenide

Nanoscale ◽  
2021 ◽  
Author(s):  
Jing Han ◽  
Yingwei Wang ◽  
Jun He ◽  
Hua Lu ◽  
Xiangping Li ◽  
...  
Keyword(s):  
Transition Metal ◽  
Physical Properties ◽  
Technology Development ◽  
Transition Metal Dichalcogenides ◽  
Two Dimensional ◽  
Two Dimensional Materials ◽  
Fabry Perot ◽  
Metal Dichalcogenides ◽  
Fundamental Research ◽  
Thin Platinum

Two-dimensional materials, such as transition metal dichalcogenides (TMDs) exhibit intriguing physical properties that lead to both fundamental research and technology development. The recently emerged platinum diselenide (PtSe2), as a new...

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