Topological defect states and phase transitions in mesoscopic superconducting squares with Rashba spin–orbit interaction

Rui-Feng Chai and Guo-Qiao Zha ()
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Rui-Feng Chai: Shanghai University
Guo-Qiao Zha: Shanghai University

The European Physical Journal B: Condensed Matter and Complex Systems, 2022, vol. 95, issue 6, 1-8

Abstract: Abstract Based on the spin-generalized Bogoliubov–de Gennes theory, we investigate the topological defect configurations in a mesoscopic superconducting square with spin–orbit (SO) interaction. The mixed even-parity d-wave and extended s-wave components can be obtained by suitable choice of the chemical potential in such a system. We find that several novel types of topological defect states can be generated in the presence of Rashba SO coupling when the external magnetic flux turns on. Unclosed domain-wall states carrying even or odd number of one-component vortices as well as double-quanta skyrmionic patterns can appear for different Rashba SO-coupling strengths. The next-nearest-neighbor hopping effect on the evolution of topological structures is further examined. A skyrmionic chain feature with one-component vortex–antivortex pairs can show up in the present mixed-pairing system. Our investigation may provide useful information for future experiments and shed new light on device designing.

Date: 2022
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DOI: 10.1140/epjb/s10051-022-00369-y

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