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Title
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Consequences of confinement on vortex ordering and dynamics in superconducting nanostripes
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Author
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Abstract
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| Understanding the response of vortices under nanoscale confinement forces in superconducting nanostripes is important for the development of superconducting electronics, like single-photon detectors, and quantum technologies such as qubits. Using numerical simulations based on the Ginzburg–Landau theory for non-homogeneous superconductivity in the presence of magnetic fields, the thesis investigates how lateral confinement organises vortices in a long superconducting nanostripe and details the consequences of such effects. It is discussed why the average vortex density is reduced, revealing that confinement forces strongly influences vortex dynamics in the dissipative regime under sourced electrical current, affecting transitions between asynchronous and synchronous vortex rows crossing the nanostripe as the current is varied. It is emphasised how synchronous crossings are of particular interest, since they cause single-mode modulations in the voltage drop along the stripe in a high (typically GHz to THz) frequency range. It is shown how such synchronous vortex crossings can be induced by inducing heated bands across the stripe causing localised channels where vortices preferably cross the stripe under specific thermodynamic conditions. |
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Language
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English
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Publication
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Camerino
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University of Camerino & University of Antwerp
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2022
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Volume/pages
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xi, 111 p.
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Note
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Perali, Andrea [Supervisor]
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Pinto, Nicola [Supervisor]
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Milošević, Milorad V. [Supervisor]
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Full text (open access)
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