单晶V2O3的金属绝缘体过渡通过范德瓦尔斯接口工程
Jie Jiang1, Lifu Zhang1, Yang Hu1
1Department of Materials Science and Engineering, Rensselaer Polytechnic Institute, Troy, New York 12180, United States.
ACS nano
|June 12, 2023
概括
这项研究揭示了氧化 (V2O3) 单晶片中独特的金属绝缘体过渡模式,与表轴膜不同. 量身定制板-基板相互作用为Mott设备应用提供了对相位过渡的控制.
科学领域:
- 凝聚物质物理学 凝聚物质物理学
- 材料科学 材料科学 材料科学
- 纳米技术纳米技术
背景情况:
- 强烈相关的电子材料表现出复杂的物理,如超导和金属绝缘体过渡.
- 二氧化物 (V2O3) 是一个关键材料,在150K附近显示合金属绝缘体和磁过渡.
- 长轴V2O3膜显示了基质依赖的现象,限制了对内在性质的理解.
研究的目的:
- 为了研究纳米尺度V2O3单晶板中的金属绝缘体过渡动力学和相位模式.
- 为了比较V2O3板在不同基板 (石墨烯,SiO2) 和独立形式上的过渡行为.
- 探索V2O3板在混合结构中的潜力,以调整材料特性和设备应用.
主要方法:
- 在纳米和微尺度上制造和表征V2O3单晶板.
- 在现场观察相位转换和分析相位模式.
- 创建混合结构 (例如V2O3/石墨烯,V2O3/SiO2,MoS2/V2O3) 来研究板-基板合效应.
- 在MoS2中通过V2O3相变生成和光学属性调整.
主要成果:
- 在V2O3板相转换过程中观察到独特的三角形形状的金属/绝缘体相交替模式.
- 在V2O3/石墨烯中证明了单阶段金属绝缘体过渡与V2O3/SiO2中的多阶段过渡,突出了基质的影响.
- 展示了独立的V2O3板,在单层MoS2中产生显著的动态应变,调整其光学性能.
- 证实了板基板合强度决定了相位过渡动力学和模式.
结论:
- 与表层膜相比,V2O3单晶片表现出不同的相位过渡行为.
- 板基板合是控制V2O3相位转换和模式的关键因素.
- 独立的V2O3板提供了一种途径,通过应变工程来动态调整其他2D材料的特性.
- 设计的混合结构为开发下一代Mott电子设备提供了一个可调节的平台.
相关概念视频
Metal-Semiconductor Junctions
395
The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The...
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The...
395
Properties of Transition Metals
26.4K
Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.
26.4K
Biasing of Metal-Semiconductor Junctions
288
Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
288
Fermi Level Dynamics
290
The vacuum level denotes the energy threshold required for an electron to escape from a material surface. It is usually positioned above the conduction band of a semiconductor and acts as a benchmark for comparing electron energies within various materials.
Electron affinity in semiconductors refers to the energy gap between the minimum of its conduction band and the vacuum level and it is a critical parameter in determining how easily a semiconductor can accept additional electrons.
The work...
Electron affinity in semiconductors refers to the energy gap between the minimum of its conduction band and the vacuum level and it is a critical parameter in determining how easily a semiconductor can accept additional electrons.
The work...
290
Theory of Metallic Conduction
1.4K
The conduction of free electrons inside a conductor is best described by quantum mechanics. However, a classical model makes predictions close to the results of quantum mechanics. It is called the theory of metallic conduction.
In this theory, Newton's second law of motion is used to determine the acceleration of an electron in the presence of an applied electric field. Then, its velocity is expressed via this acceleration.
An electron moves through the crystal, containing positive ions,...
In this theory, Newton's second law of motion is used to determine the acceleration of an electron in the presence of an applied electric field. Then, its velocity is expressed via this acceleration.
An electron moves through the crystal, containing positive ions,...
1.4K
Molecular and Ionic Solids
17.3K
Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...
17.3K


