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Soliton in two-band superconductor
1National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8568, Japan.
Physical Review Letters
|January 22, 2002
Summary
Stable solitons exist in two-band superconductors with weak interband interactions. These solitons feature a phase slip not equal to 2πn and trap non-quantized magnetic flux in superconducting rings.
Area of Science:
- Condensed matter physics
- Superconductivity theory
Background:
- Two-band superconductors exhibit complex electronic behaviors.
- Understanding phase dynamics is crucial for superconducting applications.
Purpose of the Study:
- Investigate the existence and properties of solitons in two-band superconductors.
- Characterize the phase behavior and flux trapping of these solitons.
Main Methods:
- Theoretical analysis of the superconducting order parameter in a two-band system.
- Modeling soliton dynamics under specific interaction conditions.
Main Results:
- A stable soliton state is predicted when interband interaction is significantly weaker than intraband interaction.
- The soliton exhibits a relative phase rotation of 0 to 2π (or -π to π) between the two band gap parameters.
- A non-integer multiple phase slip accompanies the soliton, trapping magnetic flux not in integral multiples of the fluxoid quantum.
Conclusions:
- Solitons represent a stable topological defect in certain two-band superconductors.
- These solitons offer a novel mechanism for flux trapping and phase manipulation in superconducting systems.