Related Experiment Video
Updated: Jun 2, 2026

Optimized Fabrication Procedure for High-Quality Graphene-based Moiré Superlattice Devices
Published on: July 11, 2025
Variety of c-axis collective excitations in layered multigap superconductors
Yukihiro Ota1, Masahiko Machida, Tomio Koyama
1CCSE, Japan Atomic Energy Agency, 6-9-3 Higashi-Ueno Taito-ku, Tokyo 110-0015, Japan.
Abstract:
We present a dynamical theory for the phase differences along a stacked direction of intrinsic Josephson junctions (IJJ's) in layered multigap superconductors, motivated by the discovery of highly anisotropic iron-based superconductors with thick perovskite-type blocking layers. The dynamical equations describing ac and dc intrinsic Josephson effects peculiar to multigap IJJ's are derived, and collective Leggett mode excitations in addition to the Josephson plasma established in single-gap IJJ's are predicted. The dispersion relations of their collective modes are explicitly displayed, and the remarkable peculiarity of the Leggett mode is demonstrated.
More Related Videos
Related Concept Videos
Types Of Superconductors
Valence Bond Theory
¹H NMR Signal Multiplicity: Splitting Patterns
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,...
Superconductor
Coulomb's Law and The Principle of Superposition
The Principle of Superposition answers the question. Yes, Coulomb's Law applies to each pair of charges, and the net force on each charge is the vector sum of the...

