门可调节的约瑟夫森二极管在魔法角度扭曲的双层石墨烯中
Alexander Rothstein1,2, Robin Joey Dolleman1, Lennart Klebl3,4
1JARA-FIT and 2nd Institute of Physics, RWTH Aachen University, 52074 Aachen, Germany.
Nano letters
|February 6, 2026
概括
研究人员观察到可调节的约瑟夫森二极管效应在魔法角度扭曲双层石墨烯 (MATBG) 约瑟夫森结点 (JJs) 中. 门的电压控制二极管的二极管.
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.
- 超导电性 超导电性 超导电性
背景情况:
- 魔法角度扭曲双层石墨烯 (MATBG) 由于莫伊尔超级晶圆,具有独特的电子特性.
- 约瑟夫森连接 (JJs) 是超导电子和量子电路的基本组成部分.
- 约瑟夫森二极管效应,即JJs中的非反向电流流,对于设备应用至关重要.
研究的目的:
- 在MATBG内部的网关定义的JJ中研究约瑟夫森二极管效应.
- 了解动力电感和超电流分布在观察到的二极管行为中的作用.
- 通过门电压探索约瑟夫森二极管效应的可调性和极性控制.
主要方法:
- 在MATBG中对邻近的,由门定义的约瑟夫森交叉点的低温测量.
- 约瑟夫森电流干扰模式的特征.
- 对约瑟夫森二极管效应门电压依赖性的分析.
主要成果:
- 两个JJ都表现出一个突出的,门调节的约瑟夫森二极管效应在moiré填充因子v = -2.2附近.
- 二极管的行为归因于较大的动力感应率和不均的超流分布.
- 微观不均性,如扭曲角度变化,影响了个体JJ行为和二极管特性.
- 门电压允许调整二极管效率,并在固定的磁场中逆转极性.
结论:
- 这项研究表明,在MATBG JJs中,可以调节门的约瑟夫森二极管效应.
- 非均的超流分布,受材料不均的影响,是二极管行为的关键.
- 这些发现为设计超导量子电路中的约瑟夫森二极管性能提供了途径.
相关概念视频
01:13Angle of Twist: Problem Solving
802
An electric motor applies a torque of 700 N·m to an aluminum shaft, triggering a stable rotation. Two pulleys, B and C, are subjected to torques of 300 N·m and 400 N·m, respectively. The modulus of rigidity is provided as 25 GPa. With the knowledge of the length and diameter of each segment, the twist angle between the two pulleys can be computed. First, a section cut is made between pulleys B and C, and the cut cross-section is analyzed using a free-body diagram. Given that the torque...
802
01:13Angle of Twist - Elastic Range
821
Consider a cylindrical shaft with a length denoted by L and a consistent cross-sectional radius referred to as r. This shaft undergoes a torque at the free end. The highest shearing strain within the shaft is directly proportional to the twist angle and the radial distance from the shaft axis. When the shaft behaves elastically, this shearing strain can be articulated using variables such as the applied torque, radial distance, the polar moment of inertia, and the modulus of rigidity. By...
821
01:29Magical Thinking
219
Magical thinking encompasses the belief in assumptions that defy logical reasoning yet appear intuitively convincing. It is a common psychological phenomenon that persists across various cultural and individual contexts. While these assumptions contradict empirical evidence and scientific laws, they often serve meaningful psychological roles in promoting emotional resilience and a sense of control, especially under stress or uncertainty.Thought-Action Fusion and the Law of SimilarityA key...
219
01:16Zener Diodes
1.2K
Zener diodes are specialized semiconductor devices designed to operate in the reverse breakdown region, where they allow current to flow into the cathode, making it positive relative to the anode. This reverse operation distinguishes Zener diodes from conventional diodes and enables their use in various applications, most notably as voltage regulators. One of the defining characteristics of Zener diodes is their nearly vertical I-V (current-voltage) characteristic curve above a certain...
1.2K
01:15The Ideal Diode
2.2K
A diode is a semiconductor device that allows current to flow in one direction only, making it a crucial component in electronic circuits for controlling the direction of current flow. An ideal diode is a simplified version of a real diode used to understand how diodes work in circuits. It possesses two terminals: the positive anode and the cathode, which is negative. When a positive voltage is applied to the anode relative to the cathode, the diode is in a forward-biased state, allowing...
2.2K
01:20Diode: Forward bias
2.2K
In semiconductor devices, diodes play a crucial role in directing current flow, and its operation is primarily categorized into forward bias and reverse bias. A diode is said to be forward-biased when its p-type region is connected to the positive terminal of a battery and its n-type region is linked to the negative terminal. This configuration reduces the potential barrier within the diode, allowing current to flow easily from the p to the n-type region.
The behavior of a diode in forward bias...
The behavior of a diode in forward bias...
2.2K