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相关概念视频

Carrier Transport01:21

Carrier Transport

889
The generation of electrical current in semiconductors is fundamentally driven by two mechanisms: drift and diffusion. These processes are essential for the functionality and performance of semiconductor-based devices.
Drift Current:
The drift of charge carriers is started by an external electric field (E). Charged particles, such as electrons and holes, experience an acceleration between collisions with lattice atoms. For electrons, this results in a drift velocity (vd) given by:
889
Drift Velocity01:19

Drift Velocity

5.3K
The high speed of electrical signals results from the fact that the force between charges acts rapidly at a distance. Thus, when a free charge is forced into a wire, the incoming charge pushes other charges ahead due to the repulsive force between like charges. These moving charges move the charges farther down the line. The density of charge in a system cannot easily be increased, so the signal is passed on rapidly. The resulting electrical shock wave moves through the system at nearly the...
5.3K
Boundary Conditions for Current Density01:25

Boundary Conditions for Current Density

1.3K
Current density becomes discontinuous across an interface of materials with different electrical conductivities. The normal component of the current density is continuous across the boundary.
1.3K
Displacement Current01:19

Displacement Current

3.7K
Ampère's law, in its usual form, does not work in places where the current changes with time and is not steady. Thus, Maxwell suggested including an additional contribution, called the displacement current, Id, to the real conduction current I.
3.7K
Linear Circuits01:17

Linear Circuits

805
A linear circuit is characterized by its output having a direct proportionality to its input, adhering to the linearity property, which encompasses the principles of homogeneity (scaling) and additivity. Homogeneity dictates that when the input, also referred to as the excitation, is multiplied by a constant factor, the output, known as the response, is correspondingly scaled by the same constant factor. For instance, if the current is multiplied by a constant 'k,' the voltage likewise...
805
Magnetic Force On A Current-Carrying Conductor01:25

Magnetic Force On A Current-Carrying Conductor

4.8K
Moving charges experience a force in a magnetic field. Since the magnetic fields produced by moving charges are proportional to the current, a conductor carrying a current creates a magnetic field around it.
Consider a compass placed near a current-carrying wire. The wire experiences a force that aligns the needle of the compass tangentially around the wire. Thus, the current-carrying wire produces concentric circular loops of magnetic field. The magnetic field generated by a wire can be...
4.8K

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Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
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一维驱动的运输系统中的上限电流波动.

Jiayin Gu1, Fan Zhang2,3

  • 1Nanjing Normal University, School of Physics and Technology, Nanjing 210023, China.

Physical review. E
|November 18, 2025
PubMed
概括
此摘要是机器生成的。

在一维驱动的运输系统中,当前波动的上限与粒子相互作用有关. 这一发现适用于具有弱相互作用的近平衡和远离平衡系统.

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科学领域:

  • 凝聚物质物理学 凝聚物质物理学
  • 统计力学 统计力学
  • 量子运输是一种量子运输.

背景情况:

  • 一维驱动的运输系统对于理解能量和电荷转移至关重要.
  • 描述波动是理解系统动态和新出现的行为的关键.

研究的目的:

  • 推测和研究1D驱动运输系统中电流波动的上限.
  • 为了探索这种束于粒子相互作用和系统平衡条件的起源.

主要方法:

  • 开发一个粗粒度模型,用于储库之间的粒子交换.
  • 在量子弹道运输中严格的数学证明.
  • 在扩散系统中的数值验证,如排除过程和带电粒子传输.

主要成果:

  • 建议为电流波动设置一个通用上限,这取决于平均电流和驱动力.
  • 在具有排斥性相互作用的系统中,接近和远离平衡的边界被证明是可接近的.
  • 这种不平等在量子弹道运输中得到了严格的证明,并得到了扩散系统的数值证据的支持.

结论:

  • 假设的上限为1D驱动运输中的电流波动提供了一个基本的极限.
  • 排斥性相互作用在建立这种波动-消散类关系方面发挥着关键作用.
  • 这些发现对表现出驱动运输现象的各种物理系统有影响.