相关实验视频

Updated: Jul 29, 2025

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform

Published on: August 2, 2019

在Ising超导体中的Fulde-Ferrell-Larkin-Ovchinnikov轨道状态

Puhua Wan¹, Oleksandr Zheliuk^1,2, Noah F Q Yuan³

¹Device Physics of Complex Materials, Zernike Institute for Advanced Materials, University of Groningen, Groningen, The Netherlands.

|May 24, 2023

概括

研究人员在2H-NbSe2中发现了一个轨道Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) 状态. 这种非传统的FFLO状态,由轨道磁场和旋转轨道合驱动,为有限动量超导提供了新的途径.

科学领域:

凝聚物质物理学
超导性
材料科学

背景情况:

传统的Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) 状态是由于Zeeman效应破坏了超导体中的时间逆向对称性.
在缺乏反向对称性的超导体中,FFLO状态可以通过与旋转轨道合 (SOC) 相互作用的Zeeman效应形成,例如Rashba SOC.
伊辛类型的SOC可以抑制泽曼效应,需要替代机制,例如在反转断裂超导体中与SOC的轨道磁场合.

研究的目的:

在多层Ising超导体2H-NbSe2中发现轨道FFLO状态.
调查这种非传统的FFLO状态的潜在机制.
在2H-NbSe2中建立轨道FFLO状态的相图.

主要方法:

使用运输测量来检测轨道FFLO状态.
对称性破坏 (转换和旋转) 的分析,以确定有限动量的库珀配对.
阶段图的特征,包括普通金属,均的超导和六倍轨道FFLO状态.

主要成果:

在2H-NbSe2中发现了轨道FFLO状态,与常规FFLO状态不同.
观察到转换和旋转对称性的破坏,证实有限动量库珀配对.
建立完整的相位图, 显示六倍轨道FFLO状态.

结论:

这项研究提出了一种通过轨道FFLO状态实现有限动量的超导机制.
这项工作为超导体实现轨道FFLO状态提供了通用途径.
2H-NbSe2的发现为探索非传统超导开辟了新的途径.

更多相关视频

Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope

Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope

Published on: March 24, 2019

Comparison of Two Different Synthesis Methods of Single Crystals of Superconducting Uranium Ditelluride

Comparison of Two Different Synthesis Methods of Single Crystals of Superconducting Uranium Ditelluride

Published on: July 8, 2021

相关概念视频

Ferromagnetism

Ferromagnetism

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...

Types Of Superconductors

Types Of Superconductors

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...

Superconductor

Superconductor

A substance that reaches superconductivity, a state in which magnetic fields cannot penetrate, and there is no electrical resistance, is referred to as a superconductor. In 1911, Heike Kamerlingh Onnes of Leiden University, a Dutch physicist, observed a relation between the temperature and the resistance of the element mercury. The mercury sample was then cooled in liquid helium to study the linear dependence of resistance on temperature. It was observed that, as the temperature decreased, the...

Theory of Metallic Conduction

Theory of Metallic Conduction

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,...

Fermi Level Dynamics

Fermi Level Dynamics

The vacuum level denotes the energy threshold required for an electron to escape from a material surface. It is usually positioned above the conduction band of a semiconductor and acts as a benchmark for comparing electron energies within various materials.
Electron affinity in semiconductors refers to the energy gap between the minimum of its conduction band and the vacuum level and it is a critical parameter in determining how easily a semiconductor can accept additional electrons.
The work...

Fermi Level

Fermi Level

The Fermi-Dirac function is represented by an S-shaped curve indicating the probability of an energy state being occupied by an electron at a given temperature. The Fermi level is the energy level at which there is a fifty percent chance of finding an electron, and it is positioned between the lower-energy valence band and the higher-energy conduction band.
At absolute zero temperature, electrons fill all energy states up to the Fermi level, leaving upper states empty. As the temperature rises,...