在扭曲的三层石墨烯Josephson交叉点中,可以调节门的轨道磁性和竞争的超导性
Vishal Bhardwaj1, Lekshmi Rajagopal1, Lorenzo Arici1
1Department of Condensed Matter Physics, Weizmann Institute of Science, Rehovot 7610001, Israel.
ACS applied materials & interfaces
|December 8, 2025
概括
超导和轨道磁力在扭曲三层石墨烯 (TTG) 装置中竞争. 研究人员使用约瑟夫森连接调整了这种竞争,揭示了对工程化莫雷系统的洞察力.
科学领域:
- 凝聚物质物理学 凝聚物质物理学
- 材料科学 材料科学 材料科学
- 量子现象是一种量子现象.
背景情况:
- 扭曲三层石墨烯 (TTG) 提供了一个可调节的莫雷平台,用于探索来自平带物理学的相关相.
- 了解这些系统中超导和磁性之间的相互作用对于新型电子应用至关重要.
研究的目的:
- 为了研究超导和自发轨道磁力 (OM) 在交替的TTG设备之间的竞争.
- 描述轨道磁相及其与门诱导超导的相互作用.
主要方法:
- 使用静电定义的交替TTG与中间扭转角度 (1.38-1.44°) 制造约瑟夫森连接点.
- 通过霍尔电阻测量,电流诱导的双稳定性和温度依赖性来描述轨道磁相.
- 分析非互惠的约瑟夫森传输,包括不对称的弗劳恩霍弗模式和超导二极管效应.
主要成果:
- 轨道磁力 (OM) 在电荷中立点 (CNP) 附近稳定,并发现与超导相竞争.
- OM阶段表现出时间逆转对称性被打破,由急剧的霍尔电阻跳跃和 bistability 证明.
- 非互惠的约瑟夫森传输证实了轨道磁状态,临界温度层次证明了OM和超导之间的可调节竞争.
结论:
- 交替的TTG约瑟夫森设备作为研究磁力和超导的共存的最小和多功能平台.
- 在TTG中,这两个破坏对称的基本状态之间的可调节竞争为探索复杂量子现象提供了新的途径.
相关概念视频
Types Of Superconductors
1.6K
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...
1.6K
Biasing of Metal-Semiconductor Junctions
521
Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
521
Ferromagnetism
2.9K
Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
2.9K
Theory of Metallic Conduction
1.7K
The conduction of free electrons inside a conductor is best described by quantum mechanics. However, a classical model makes predictions close to the results of quantum mechanics. It is called the theory of metallic conduction.
In this theory, Newton's second law of motion is used to determine the acceleration of an electron in the presence of an applied electric field. Then, its velocity is expressed via this acceleration.
An electron moves through the crystal, containing positive ions,...
In this theory, Newton's second law of motion is used to determine the acceleration of an electron in the presence of an applied electric field. Then, its velocity is expressed via this acceleration.
An electron moves through the crystal, containing positive ions,...
1.7K
Magnetic Field Due To A Thin Straight Wire
6.0K
Consider an infinitely long straight wire carrying a current I. The magnetic field at point P at a distance a from the origin can be calculated using the Biot-Savart law.
6.0K
Magnetic Force Between Two Parallel Currents
4.5K
Two long, straight, and parallel current-carrying conductors exert a force of equal magnitude on one another. The direction of the force depends on the current direction in the conductors.
The force exerted by the magnetic field due to the first conductor over a finite length of the second conductor is given as the product of the current in the second conductor and the vector product of the length vector along the current element and the field due to the first conductor. According to the...
The force exerted by the magnetic field due to the first conductor over a finite length of the second conductor is given as the product of the current in the second conductor and the vector product of the length vector along the current element and the field due to the first conductor. According to the...
4.5K


