相关实验视频
Updated: Jun 26, 2025

10:26
Fabrication and Characterization of Superconducting Resonators
Published on: May 21, 2016
11.3K
在有直接传输和共振局部状态的情况下超电流
Vukan Levajac1, Hristo Barakov2, Grzegorz P Mazur1
1QuTech and Kavli Institute of Nanoscience, Delft University of Technology, 2600 GA Delft, The Netherlands.
Physical review letters
|May 10, 2024
概括
我们观察到抗- (InSb-Al) 纳米线约瑟夫森连接的电流相位关系 (CPR) 中的π变化. 这些由磁场和门电压影响的变化是由一个涉及共振局部状态的理论模型解释的.
科学领域:
- 凝聚物质物理学 凝聚物质物理学
- 量子材料科学 量子材料科学
- 纳米技术纳米技术
背景情况:
- 约瑟夫森连接是量子电子学的基础.
- 了解电流相位关系 (CPR) 对于控制超级电流流量至关重要.
- (InSb-Al) 纳米线为超导装置提供了独特的特性.
研究的目的:
- 为了研究InSb-Al纳米线Josephson连接的电流相位关系 (CPR).
- 探索平行磁场和门电压对CPR的影响.
- 从理论上建模观察到的CPR现象.
主要方法:
- InSb-Al纳米线约瑟夫森连接的制造和表征.
- 在高达700mT的平行磁场中测量CPR.
- 一个理论模型用于超电流传输分析的应用.
主要成果:
- 在高磁场和特定门电压间隔下观察CPR中的π变化.
- 检测超电流下降和不对称的门电压依赖在π转移附近.
- 即使在零磁场下,也可以对这些特征进行实验观测.
结论:
- 观察到的CPR特性与理论预测是一致的.
- 超流传输是由直接传输和共振局部状态之间的干扰控制的.
- 在InSb-Al纳米线约瑟夫森连接处,可控制的π相转移与量子应用相关.
相关概念视频
Sound Waves: Resonance
2.6K
Resonance is produced depending on the boundary conditions imposed on a wave. Resonance can be produced in a string under tension with symmetrical boundary conditions (i.e., has a node at each end). A node is defined as a fixed point where the string does not move. The symmetrical boundary conditions result in some frequencies resonating and producing standing waves, while other frequencies interfere destructively. Sound waves can resonate in a hollow tube, and the frequencies of the sound...
2.6K
Series Resonance
174
The RLC circuit impedance is defined as the ratio of the supply voltage to the circuit current. Resonance in such a circuit occurs when the imaginary part of this impedance equals zero. This specific condition means that the inductive reactance is exactly equal to the capacitive reactance. The frequency at which this happens is known as the resonant frequency. Mathematically, the resonant frequency is inversely proportional to the square root of the product of the inductance (L) and capacitance...
174
Resonance in an AC Circuit
2.0K
The property of an inductor makes it resist any change in the current passing through it, while the property of a capacitor is to build up the charge across its terminals. Hence, if an inductor and capacitor are connected in series, they have opposite effects on the relative phase between current and voltage. The current through the circuit undergoes forced oscillation at the frequency of the source. The resistance term in an R-L-C circuit acts as a damping term because power is dissipated...
2.0K
Parallel Resonance
207
The parallel RLC circuit is an arrangement where the resistor (R), inductor (L), and capacitor (C) are all connected to the same nodes and, as a result, share the same voltage across them. The parallel RLC circuit is analyzed in terms of admittance (Y), which reflects the ease with which current can flow. The admittance is given by:
207
Characteristics of Series Resonant Circuit
254
Series resonance occurs in a circuit containing inductive (L), capacitive (C), and resistive (R) elements connected sequentially. At the resonance frequency, the inductive and capacitive reactances are equal in magnitude but opposite in sign, effectively canceling each other. This causes the circuit's impedance is minimal, primarily determined by the resistance R. The resonant frequency of an RLC circuit is defined as:
254
The Power Superposition Principle
152
Consider a circuit with two sinusoidal voltage sources. Each one influences the circuit independently, and the superposition principle helps us understand the combined effect by adding up the responses from each source.
152

