在新兴的二维半导体中激发极子
Haifeng Kang1, Jingwen Ma2, Junyu Li1
1Key Laboratory of Artificial Micro/Nano Structure of Ministry of Education, School of Physics and Technology, Wuhan University, Wuhan, 430072, P. R. China.
ACS nano
|December 5, 2023
概括
激发极子,混合光-物质准粒子,正在与二维半导体取得进展,使新的量子现象和光子应用成为可能. 这项研究强调了这个令人兴奋的领域最近的发现和未来的方向.
科学领域:
- 量子光学就是量子光学.
- 凝聚物质物理学 凝聚物质物理学
- 材料科学 是一种材料科学.
背景情况:
- 刺激极子是混合光-物质准粒子,由半导体中的光子和刺激子相互作用形成.
- 这些准粒子表现出令人着迷的量子现象,包括斯-爱因斯坦凝聚和光子阻塞.
- 最近的进展涉及二维 (2D) 半导体和光子结构,推动量子研究和光子应用的边界.
研究的目的:
- 审查激电极子的基本概念和研究进展,重点关注新兴的二维系统.
- 为突出2D激子极子的关键发现和应用.
- 为了调查新的二维材料,如二维矿和反铁磁半导体,用于操纵激子极子.
主要方法:
- 介绍基本概念:二维激子,光学共振器和强合系统.
- 审查研究进展,并强调在刺激极子中重要的发现,特别是2D变体.
- 调查新兴的二维半导体及其在操纵激电极子中的作用.
- 对非线性相互作用的前景和数值模拟的介绍.
主要成果:
- 详细讨论新出现的二维激子极子,包括强合的实现和观察到的现象.
- 探索新的2D材料 (2D矿,AFM半导体) 以对激电极子进行先进控制.
- 介绍了2D激子极子的非线性相互作用的初始数值模拟.
结论:
- 2D刺激极子代表了量子光学和光子应用的重大进步.
- 新兴的二维材料为控制激子极子特性提供了新的自由度.
- 这种观点可以作为未来量子光学和拓光子学研究的资源.
相关概念视频
Semiconductors
708
There is variation in the electrical conductivity of materials - metals, semiconductors, and insulators that are showcased with the help of the energy band diagrams.
Metals such as copper (Cu), zinc (Zn), or lead (Pb) have low resistivity and feature conduction bands that are either not fully occupied or overlap with the valence band, making a bandgap non-existent. This allows electrons in the highest energy levels of the valence band to easily transition to the conduction band upon gaining...
Metals such as copper (Cu), zinc (Zn), or lead (Pb) have low resistivity and feature conduction bands that are either not fully occupied or overlap with the valence band, making a bandgap non-existent. This allows electrons in the highest energy levels of the valence band to easily transition to the conduction band upon gaining...
708
Types of Semiconductors
613
Intrinsic semiconductors are highly pure materials with no impurities. At absolute zero, these semiconductors behave as perfect insulators because all the valence electrons are bound, and the conduction band is empty, disallowing electrical conduction. The Fermi level is a concept used to describe the probability of occupancy of energy levels by electrons at thermal equilibrium. In intrinsic semiconductors, the Fermi level is positioned at the midpoint of the energy gap at absolute zero. When...
613
Fermi Level
616
The Fermi-Dirac function is represented by an S-shaped curve indicating the probability of an energy state being occupied by an electron at a given temperature. The Fermi level is the energy level at which there is a fifty percent chance of finding an electron, and it is positioned between the lower-energy valence band and the higher-energy conduction band.
At absolute zero temperature, electrons fill all energy states up to the Fermi level, leaving upper states empty. As the temperature rises,...
At absolute zero temperature, electrons fill all energy states up to the Fermi level, leaving upper states empty. As the temperature rises,...
616
Fermi Level Dynamics
257
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...
257
Band Theory
15.2K
When two or more atoms come together to form a molecule, their atomic orbitals combine and molecular orbitals of distinct energies result. In a solid, there are a large number of atoms, and therefore a large number of atomic orbitals that may be combined into molecular orbitals. These groups of molecular orbitals are so closely placed together to form continuous regions of energies, known as the bands.
The energy difference between these bands is known as the band gap.
Conductor, Semiconductor,...
The energy difference between these bands is known as the band gap.
Conductor, Semiconductor,...
15.2K
Energy Bands in Solids
879
Isolated atoms have discrete energy levels that are well described by the Bohr model. And, it quantifies the energy of an electron in a hydrogen atom as En. Higher quantum numbers 'n' yield less negative, closer electron energy levels.
Band Formation:
When atoms are brought close together, as in a solid, these discrete energy levels begin to split due to the overlap of electron orbitals from adjacent atoms. This split occurs because of the Pauli exclusion principle, which states...
Band Formation:
When atoms are brought close together, as in a solid, these discrete energy levels begin to split due to the overlap of electron orbitals from adjacent atoms. This split occurs because of the Pauli exclusion principle, which states...
879


