Dynamic metastable vortex states in interacting vortex lines
| Autor: | Kozlov, Sergei, Lesueur, Jérôme, Roditchev, Dimitri, Feuillet-Palma, Cheryl |
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| Rok vydání: | 2023 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| Popis: | The electron transport in current-biased superconducting nano-bridges is determined by the motion of the quantum vortex confined in the internal disorder landscape. Here we consider a simple case of a single or two neighbouring linear defects crossing a nano-bridge. The strong anharmonicity of the vortex motion along the defect leads, upon RF-excitation, to fractional Shapiro steps. In the case of two defects, the vortex motion becomes correlated, characterized by metastable states that can be locked to a resonant RF-drive. The lock-unlock process causes sudden voltage jumps and drops in the voltage-current characteristics observed in experiments. We analyze the parameters promoting these metastable dynamic states and discuss their potential applications in quantum devices. Comment: 9 pages, 8 figures |
| Databáze: | arXiv |
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