相关实验视频
Updated: Feb 16, 2026

11:21
Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving
Published on: March 30, 2017
7.9K
在强烈相互作用的二维费米气体中的高温配对
Puneet A Murthy1, Mathias Neidig2, Ralf Klemt2
1Physics Institute, Heidelberg University, Heidelberg, Germany. murthy@physi.uni-heidelberg.de.
概括
超冷费米离子原子中的多体配对关系在高温下持续存在,超过两体结合能. 这些在正常阶段的强相关性是由多体效应驱动的, 而不是单个粒子相互作用.
科学领域:
- 量子多体物理学
- 凝聚物质物理学
- 超冷的原子气体
背景情况:
- 了解密切相关的费米子系统的正常阶段是一个关键的挑战.
- 在这些系统中配对相关性的作用,特别是在高温下,仍然不清楚.
研究的目的:
- 在二维超冷费米子原子中研究多体配对能量.
- 确定温度和相互作用强度对配对的影响.
- 为了阐明正常阶段配对背后的驱动机制.
主要方法:
- 使用空间分辨率的射频谱.
- 在广泛的温度和相互作用强度范围内测量配对能量.
- 研究了超冷费米子原子的二维气体.
主要成果:
- 在远高于超流体临界温度的温度下观察到显著的多体配对.
- 在强相互作用的状态下,配对能量超过了两体的结合能量.
- 配对能量显然依赖于当地的原子密度.
结论:
- 强烈相互作用的二维费米子系统中的配对主要由多体相关性驱动.
- 这些配对对应对热波动具有显著的稳定性.
- 这些发现揭示了强烈相关的费米子中正常相的复杂性.
相关概念视频
Fermi Level
1.9K
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,...
1.9K
The Pauli Exclusion Principle
59.7K
The arrangement of electrons in the orbitals of an atom is called its electron configuration. We describe an electron configuration with a symbol that contains three pieces of information:
59.7K
Heat Capacities of an Ideal Gas II
3.8K
For a system that undergoes a thermodynamic process at a constant volume condition, the heat absorbed is used only to increase the system's internal energy and not for doing any kind of work. While for a system undergoing a thermodynamic process under a constant pressure condition, the amount of heat absorbed is used not only for increasing the internal energy (as a function of temperature) but also for doing some work. The molar heat capacity is the amount of heat required to increase the...
3.8K
Heat Capacities of an Ideal Gas III
3.4K
The number of independent ways a gas molecule can move along straight line, rotate, and vibrate is called its degrees of freedom. Supposing d represents the number of degrees of freedom of an ideal gas, the molar heat capacity at constant volume of an ideal gas in terms of d is
3.4K
Heat Capacities of an Ideal Gas I
4.3K
Heat capacity is the ratio of heat absorbed by the substance corresponding to its temperature change. It is also called thermal capacity and the SI unit of heat capacity is J/K. Whereas, specific heat capacity is defined as the amount of heat necessary to change the temperature of 1 kg of a substance by 1 K and is also called massic heat capacity. Its SI unit is J/kg⋅K.
Molar heat capacity quantifies the ratio of the amount of heat added (or removed) to increase (or decrease) the...
Molar heat capacity quantifies the ratio of the amount of heat added (or removed) to increase (or decrease) the...
4.3K
Fermi Level Dynamics
763
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...
763

