Speaker
Description
State-of-the art fabrication techniques allow for creation of topologically non-trivial and geometrically complex nanostructures ranging from quantum rings to 3D nanoarchitectures. Quantum rings are a special class of high-tech nanostructures, which provide a unique playground for the quantum-mechanical paradigm and topological physics [1]. Models of magnetoresistance oscillations in mesoscopic rings of low- and high-critical-temperature superconductors take into account the quantum-interference manifestations. Self-assembly and direct writing of 3D nanoarchitectures trigger the emergence of new physical phenomena [2]. In superconductor open nanotubes and nanohelices, a topological transition between the vortex and phase-slip regimes determines the magnetic-field$-$voltage and current$-$voltage characteristics revealing a nontrivial topology of superconducting screening currents. In a densely packed W$-$C nanoarray fabricated using FIBID [3], in addition to vortex pinning, periodic magnetoresistance oscillations may be associated with magnetic flux quantization effects and interference of circulating supercurrents within the periodic structure. In a directly written superconductor W$-$C nanobridge, a strong anisotropy of the critical magnetic field gives rise to the reconfigurable coexistence of superconducting and normal states. In this regime of nano-superconductivity, the vortex state can be designed and manipulated by geometric confinement [4]. These findings highlight the potential of 3D nanoarchitectures as a prospective platform for quantum technologies [5].
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V. M. Fomin, Physics of Quantum Rings, 3rd edition (Springer Nature Switzerland, Cham, 2025).
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V. M. Fomin, Self-rolled micro- and nanoarchitectures: Effects of topology and geometry (De Gruyter, Berlin$-$Boston, 2021).
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A. Arroyo-Fructuoso et al., APL Quantum 3, 016108 (2026).
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E. Zhakina et al., Adv. Funct. Mater. 35, 2506057 (2025).
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O. Dobrovolskiy et al., Supercond. Sci. Technol. 39, 023502 (2026).