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相关概念视频

Superconductor01:24

Superconductor

1.9K
A substance that reaches superconductivity, a state in which magnetic fields cannot penetrate, and there is no electrical resistance, is referred to as a superconductor. In 1911, Heike Kamerlingh Onnes of Leiden University, a Dutch physicist, observed a relation between the temperature and the resistance of the element mercury. The mercury sample was then cooled in liquid helium to study the linear dependence of resistance on temperature. It was observed that, as the temperature decreased, the...
1.9K
Types Of Superconductors01:28

Types Of Superconductors

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A superconductor is a substance that offers zero resistance to the electric current when it drops below a critical temperature. Zero resistance is not the only interesting phenomenon as materials reach their transition temperatures. A second effect is the exclusion of magnetic fields. This is known as the Meissner effect. A light, permanent magnet placed over a superconducting sample will levitate in a stable position above the superconductor. High-speed trains that levitate on strong...
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Magnetic Field due to Moving Charges01:23

Magnetic Field due to Moving Charges

11.9K
A stationary charge creates and interacts with the electric field, while a moving charge creates a magnetic field.
Consider a point charge moving with a constant velocity. Like the electric field, the magnetic field at any point is directly proportional to the magnitude of the charge and inversely proportional to the square of the distance between the source point and the field point. However, unlike the electric field, the magnetic field is always perpendicular to the plane containing the line...
11.9K
Diamagnetic Shielding of Nuclei: Local Diamagnetic Current01:14

Diamagnetic Shielding of Nuclei: Local Diamagnetic Current

1.5K
An applied magnetic field causes the electrons present in the molecule to circulate, setting up a local diamagnetic current within the molecule. The local diamagnetic current arising from circulating sigma-bonding electrons induces a magnetic field, Blocal that opposes the applied magnetic field, B0. The effective magnetic field experienced by these nuclei is given by the difference between the applied and local magnetic fields in a phenomenon called local diamagnetic shielding. Essentially,...
1.5K
Motion Of A Charged Particle In A Magnetic Field01:22

Motion Of A Charged Particle In A Magnetic Field

7.4K
A charged particle experiences a force when moving through a magnetic field. Consider the field to be uniform and the charged particle to move perpendicular to it. If the field is in a vacuum, the magnetic field is the dominant factor determining the motion. Since the magnetic force is perpendicular to the direction of motion, a charged particle follows a curved path. The particle continues to follow this curved path until it forms a complete circle. Another way to look at this is that the...
7.4K
Electric Field Inside a Conductor01:20

Electric Field Inside a Conductor

7.6K
When a conductor is placed in an external electric field, the free charges in the conductor redistribute and very quickly reach electrostatic equilibrium. The resulting charge distribution and its electric field have many interesting properties, which can be investigated with the help of Gauss's law.
Suppose a piece of metal is placed near a positive charge. The free electrons in the metal are attracted to the external positive charge and migrate freely toward that region. This region then...
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相关实验视频

Updated: Mar 3, 2026

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
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超导云室是一种超导云室.

Bo Gao1,2, Jie Sheng1,3, Tsutomu T Yanagida1,3

  • 1Shanghai Jiao Tong University, Tsung-Dao Lee Institute, Shanghai 201210, China.

Physical review letters
|March 1, 2026
PubMed
概括
此摘要是机器生成的。

我们介绍了超导云室,一个使用约瑟夫森连接的新型粒子探测器. 该装置检测低能带电粒子,并可能揭示千米电荷暗物质候选物.

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科学领域:

  • 粒子物理学 粒子物理学
  • 量子检测技术 量子检测技术

背景情况:

  • 检测低能带电粒子是一项挑战.
  • 现有的方法在高灵敏度检测方面存在局限性.

研究的目的:

  • 提出一种使用约瑟夫森连接的新粒子探测器.
  • 为了能够检测极低动能带电粒子.
  • 探索暗物质检测中的应用.

主要方法:

  • 一个超导云室的开发.
  • 在约瑟夫森结处测量量子相差.
  • 使用超导原理进行粒子检测.

主要成果:

  • 超导云室可以检测具有非常低动能的带电粒子.
  • 该装置提供了一种观察缓慢移动粒子的新方法.
  • 潜在的应用是检测有毫米电荷的暗物质粒子 (10^310^10 GeV).

结论:

  • 超导云室代表了粒子检测的重大进步.
  • 这项技术为探索低能物理和暗物质开辟了新的途径.
  • 进一步的研究可以为各种应用优化探测器.