Related Experiment Video
Updated: Mar 17, 2026
05:39
Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
Published on: August 2, 2019
10.5K
The p-wave superconductivity in the presence of Rashba interaction in 2DEG
Ke-Chuan Weng1,2,3, C D Hu1,2
1Department of Physics, National Taiwan University, Taipei 10617, Taiwan.
Scientific Reports
|July 27, 2016
Summary
The Rashba interaction induces p-wave superconductivity in 2D systems. Electron-phonon interactions, especially Umklapp processes, are crucial for enhancing the superconducting transition temperature (Tc).
Area of Science:
- Condensed Matter Physics
- Superconductivity
- Spintronics
Background:
- Two-dimensional electron gases (2DEGs) are fundamental systems for exploring novel quantum phenomena.
- Superconductivity in reduced dimensions presents unique theoretical and experimental challenges.
- The Rashba spin-orbit interaction significantly modifies electronic band structures.
Purpose of the Study:
- To investigate the impact of the Rashba interaction on superconductivity in 2D systems.
- To understand the nature of Cooper pairing and gap functions under Rashba coupling.
- To analyze the role of electron-phonon interactions in mediating this novel superconductivity.
Main Methods:
- Theoretical analysis of coupled gap equations considering intraband and interband scattering.
- Detailed study of electron-phonon interactions, including normal and Umklapp processes.
- Investigation of the resulting anisotropic gap function and its implications.
Main Results:
- The Rashba interaction leads to spin-degenerate bands and coupled gap equations.
- A p-wave superconducting state is predicted due to spin-dependent scattering.
- Anisotropic gap functions of the form cos(φk) were identified.
- Umklapp processes significantly enhance the electron-phonon coupling and transition temperature (Tc).
Conclusions:
- The Rashba interaction is a viable mechanism for inducing p-wave superconductivity in 2D systems.
- Electron-phonon interactions, particularly Umklapp scattering, are essential for achieving observable superconducting transition temperatures.
- This work provides a theoretical framework for exploring novel superconducting states in spin-orbit coupled systems.
Related Concept Videos
03:06The Pauli Exclusion Principle
60.4K
The arrangement of electrons in the orbitals of an atom is called its electron configuration. We describe an electron configuration with a symbol that contains three pieces of information:
60.4K
02:42Valence Bond Theory
11.5K
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
11.5K
01:24Superconductor
2.0K
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...
2.0K
01:03Atomic Nuclei: Nuclear Spin State Overview
2.2K
NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of one, the...
2.2K
01:26Electric Field at the Surface of a Conductor
5.6K
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...
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...
5.6K
01:20Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)
1.9K
Two NMR-active nuclei bonded to a central atom can be involved in geminal or two-bond coupling. Geminal coupling is commonly seen between diastereotopic protons in chiral molecules and unsymmetrical alkenes, among others.
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...
1.9K