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相关概念视频

The Hall Effect01:30

The Hall Effect

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Edwin H. Hall, in the year 1879, devised an experiment that could be used to identify the polarity of the predominant charge carriers in a conducting material. From a historical perspective, this experiment was the first to demonstrate that the charge carriers in most metals are negative.
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Electric Field at the Surface of a Conductor01:26

Electric Field at the Surface of a Conductor

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Consider a conductor in electrostatic equilibrium. The net electric field inside a conductor vanishes, and extra charges on the conductor reside on its outer surface, regardless of where they originate.
In the 19th century, Michael Faraday conducted the famous ice pail experiment to prove that the charges always reside on the surface of a conductor. The experimental set-up consists of a conducting uncharged container mounted on an insulating stand. The outer surface of the container is...
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Electric Field Inside a Conductor01:20

Electric Field Inside a Conductor

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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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Magnetic Field due to Moving Charges01:23

Magnetic Field due to Moving Charges

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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...
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Electric Field of Parallel Conducting Plates01:16

Electric Field of Parallel Conducting Plates

1.1K
Gauss' law relates the electric flux through a closed surface to the net charge enclosed by that surface. Gauss's law can be applied to find the electric field and the charge enclosed in a region depending on its charge distribution.
Consider a cross-section of a thin, infinite conducting plate having a positive charge. For such a large thin plate, as the thickness of the plate tends to zero, the positive charges lie on the plate's two large faces. Without an external electric...
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Magnetic Field Of A Current Loop01:16

Magnetic Field Of A Current Loop

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Consider a circular loop with a radius a, that carries a current I. The magnetic field due to the current at an arbitrary point P along the axis of the loop can be calculated using the Biot-Savart law.
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Updated: Sep 14, 2025

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
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准-Φ-周期超电流在量子大厅转换时

Ivan Villani1, Matteo Carrega2, Alessandro Crippa1

  • 1NEST, Istituto Nanoscienze-CNR and Scuola Normale Superiore, Piazza San Silvestro 12, Pisa 56127, Italy.

ACS nano
|July 24, 2025
PubMed
概括
此摘要是机器生成的。

研究人员在石墨烯约瑟夫森连接处观察到超电流,将超导和量子霍尔效应联系起来. 这一发现推进了拓量子计算,并为研究透超流提供了一个新的平台.

关键词:
约瑟夫森交叉口 约瑟夫森交叉口石墨烯是一种石墨烯.量子大厅是一个量子大厅.量子设备是一种量子设备.超级电流是超级电流的一种.

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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.
  • 拓量子计算 拓量子计算

背景情况:

  • 超导和量子霍尔 (QH) 效应之间的协同作用对于推进拓量子计算至关重要.
  • 以前的研究表明,QH边缘状态可以调解石墨烯弱环中的超流.

研究的目的:

  • 在石墨烯中报告了与相邻的QH高原之间的过渡相关的超级电流的观察.
  • 研究范德瓦尔斯装置中透超级电流的传输模式.

主要方法:

  • 使用在六角化 (hBN) 中封装的高流动性CVD培养的石墨烯制造一个后门石墨烯约瑟夫森结口.
  • 与Nb接触石墨烯导致形成约瑟夫森结.
  • 采用量子干扰研究和磁场扫描来观察超级电流.

主要成果:

  • 观测一种超级电流,与相邻的QH高原之间的过渡有关,在可压缩散体中有运输路径.
  • 在Nb接触器的临界场附近检测到持续到2.4 T的超导口袋.
  • 观察QH超电流与磁场的近似周期率 Φ0 = h/2e,表明其干扰了近距离的透相.

结论:

  • 这项研究展示了一个新的实验平台,用于研究石墨烯中的透超流.
  • 这些发现有助于理解量子技术的混合超导拓状态.
  • 范德瓦尔斯装置的灵活性为探索奇特的量子现象提供了新的途径.