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Scanning SQUID Study of Vortex Manipulation by Local Contact

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Electromagnetic radiation from vortex flow in Type-II superconductors.

L N Bulaevskii¹, E M Chudnovsky

¹Los Alamos National Laboratory, Los Alamos, NM 87545, USA.

Physical Review Letters

|December 13, 2006

Summary

A moving vortex lattice emits harmonic radiation at its crystal edge. This phenomenon, linked to the superconducting gap, can generate terahertz radiation and characterize vortex lattices.

Area of Science:

Condensed Matter Physics
Superconductivity
Electromagnetism

Background:

Vortex lattices in superconductors exhibit complex dynamics.
Understanding vortex motion is crucial for superconducting device applications.
Radiation from dynamic vortices is a key area of research.

Purpose of the Study:

To investigate the radiation emitted by a moving vortex lattice at a crystal edge.
To explore the relationship between vortex lattice dynamics and emitted radiation frequencies.
To assess the potential for terahertz radiation generation and vortex lattice characterization.

Main Methods:

Theoretical computation of radiation power from a moving vortex lattice.
Analysis of harmonic frequencies related to the washboard frequency (omega(0)=2pi v/a).

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Investigation of radiation up to the superconducting gap (Delta/2pi).

Main Results:

A moving vortex lattice radiates harmonics of the washboard frequency at the crystal edge.
The radiation extends up to the superconducting gap energy.
Calculated radiation power indicates significant emission.

Conclusions:

The edge radiation of a moving vortex lattice is a significant physical effect.
This effect can be harnessed for the generation of terahertz radiation.
The phenomenon provides a novel method for characterizing moving vortex lattices.