相关实验视频
Updated: Jun 28, 2025

11:21
Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving
Published on: March 30, 2017
7.4K
弗洛克特·费米 液体
Li-Kun Shi1, Oles Matsyshyn2, Justin C W Song2
1Institut für Theoretische Physik, Universität Leipzig, Brüderstraße 16, 04103, Leipzig, Germany.
Physical review letters
|April 19, 2024
概括
我们发现了一个新的不平衡Floquet Fermi液态与嵌套的费米表面. 这种状态表现出独特的量子振荡和可调节性质,为驱动量子物质提供了新的见解.
科学领域:
- 凝聚物质物理学 凝聚物质物理学
- 量子材料是一种量子材料.
- 驱动量子系统驱动的量子系统
背景情况:
- 了解不平衡量子态对于推进量子技术至关重要.
- 弗洛奎特理论描述了系统定期驱动出平衡.
- 费米液体对于了解金属至关重要,但它们的不平衡行为较少被探索.
研究的目的:
- 为了证明存在一个新的不平衡Floquet-Fermi液态状态的存在.
- 描述这种状态的特性,包括它的费米表面和对磁场的反应.
- 探索调整这些Floquet Fermi表面的特性方法.
主要方法:
- 部分填充的Floquet Bloch带与费米离子浴相结合的理论建模.
- 在磁场下的量子振荡的分析.
- 具体热量和状态的热力学密度的研究.
- 在Floquet Fermi表面上探索驱动频率控制.
主要成果:
- 证明存在一个不平衡的弗洛克特·费米液态与嵌套的"弗洛克特·费米表面".
- 观测到具有缓慢跳动模式的量子振荡,与实验微波诱导的电阻振荡一致.
- 通过控制驱动频率,展示了将Floquet Fermi表面调整为不平衡的范霍夫奇点的能力.
结论:
- 已识别的Floquet Fermi液态为理解驱动量子物质提供了一个新的范式.
- 观察到的现象为解释微波引起的电阻振荡的实验结果提供了一个框架.
- 这项工作为控制量子状态和探索周期驱动系统中的新现象开辟了道路.
相关概念视频
Fermi Level
589
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,...
589
Fermi Level Dynamics
245
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...
245
Fluid Mosaic Model
11.6K
Scientists identified the plasma membrane in the 1890s and its principal chemical components (lipids and proteins) by 1915. The model for plasma membrane structure, proposed in 1935 by Hugh Davson and James Danielli, was the first model to be widely accepted in the scientific community. The model was based on the plasma membrane's "railroad track" appearance in early electron micrographs. Davson and Danielli theorized that the plasma membrane's structure resembled a sandwich...
11.6K
The Fluid Mosaic Model
147.1K
The fluid mosaic model was first proposed as a visual representation of research observations. The model comprises the composition and dynamics of membranes and serves as a foundation for future membrane-related studies. The model depicts the structure of the plasma membrane with a variety of components, which include phospholipids, proteins, and carbohydrates. These integral molecules are loosely bound, defining the cell’s border and providing fluidity for optimal function.
147.1K
Molecular and Ionic Solids
17.1K
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...
17.1K
First Law: Particles in One-dimensional Equilibrium
6.9K
Newton's first law of motion states that a body at rest remains at rest, or if in motion, remains in motion at constant velocity, unless acted on by a net external force. It also states that there must be a cause for any change in velocity (a change in either magnitude or direction) to occur. This cause is a net external force. For example, consider what happens to an object sliding along a rough horizontal surface. The object quickly grinds to a halt, due to the net force of friction. If...
6.9K

