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Friedel oscillation in charge profile and position dependent screening around a superconducting vortex core
1CCSE, Japan Atomic Energy Research Institute, Ueno Sumitomo Building 8, 6-9-3 Higashi-Ueno, Taito-ku, Tokyo 110-0015, Japan.
Physical Review Letters
|March 14, 2003
Summary
Charge distribution in type II superconductors reveals central depletion and oscillations near vortices. Spatial screening properties are clarified by analyzing the density-density correlation function.
Area of Science:
- Condensed Matter Physics
- Superconductivity Theory
Background:
- Type II superconductors exhibit quantized magnetic flux lines called vortices.
- Understanding the electronic properties around these vortices is crucial for superconductor applications.
Purpose of the Study:
- To microscopically calculate the charge distribution around a vortex in type II superconductors.
- To investigate the spatial screening properties within the vortex core region.
Main Methods:
- Simultaneous solution of the Bogoliubov-de Gennes and Poisson equations.
- Calculation of the density-density correlation function K(r,r(')) as a function of two spatial variables.
Main Results:
- Observed charge density depletion at the vortex center.
- Identified Friedel oscillations extending over the coherence length for small k(F)xi.
- Found strong distance dependence of K(r,r(')) from the vortex center.
Conclusions:
- The study clarifies spatial-dependent screening properties based on the correlation function in the vortex core.
- Charge distribution is intricately linked to vortex structure and screening effects.