Előadó: Vladimir Fomin (Institute for Emerging Electronic Technologies, Leibniz IFW Dresden, Germany; Moldova State University, Republic of Moldova; vendéglátó: Újfalussy Balázs)
Előadásának címe: New Developments in Topological, Chiral and Reconfigurable Superconductor Nanoarchitectures
Dátum: 2026. január 12. hétfő, 10 óra
Helyszín: 1-es épület tanácsterem
Összefoglaló
Advanced high-tech fabrication techniques allowed for fabrication of geometrically complex and topologically nontrivial 3D nanoarchitectures [1] triggers the emergence of new physical phenomena [2,3]. Relying upon the time-dependent Ginzburg-Landau equation, a variety of vortex chains, vortex jets, and phase-slip regimes due to the inhomogeneity of the normal magnetic field component are unveiled in 3D nanoarchitectures. A topological transition between the vortex and phase-slip regimes determines the magnetic-field--voltage and current--voltage characteristics revealing a nontrivial topology of SC screening currents [4,5]. Various dynamic topological transitions in superconductor open nanotubes take place under a combined dc+ac transport current [6], leading to vortex frequency locking and Shapiro steps [7]. In directly written superconductor 3D nanoarchitectures, a strong geometrical anisotropy of the critical magnetic field gives rise to the reconfigurable coexistence of superconducting and normal states. In this novel regime of nano-superconductivity, the vortex state can be designed and manipulated by geometric confinement [8]. Recently, a conformal approach has been proven to be efficient for physics simulations in thin curved 3D membranes [9].
1. V. M. Fomin, Self-rolled micro- and nanoarchitectures: Effects of topology and geometry, De Gruyter, Berlin--Boston, 2021, 148 p.
2. V. M. Fomin, O. V. Dobrovolskiy, A perspective on superconductivity in curved 3D nanoarchitectures”, Appl. Phys. Lett. 120, 090501, 1-12 (2022).
3. R. Córdoba, V. M. Fomin, Topological and chiral superconductor nanoarchitectures, Applied Physics Letters 124, 170501, 1-9 (2024).
4. R. O. Rezaev, E. I. Smirnova, O. G. Schmidt, V. M. Fomin, Topological transitions in superconductor nanomembranes in a magnetic field with submicron inhomogeneity under a strong transport current, Communications Physics 3, 144, 1-8 (2020).
5. I. Bogush, V. M. Fomin, Topological defects in superconductor open nanotubes after gradual and abrupt switch-on of the transport current and magnetic field, Phys. Rev. B 105, 094511, 1-11 (2022).
6. V. M. Fomin, R. O. Rezaev, O. V. Dobrovolskiy, Topological transitions in ac/dc-driven superconductor nanotubes, Scientific Reports 12, 10069, 1-10 (2022).
7. I. Bogush, V. M. Fomin, O. V. Dobrovolskiy, Vortex frequency locking and Shapiro steps in superconductor open nanotubes, Phys. Rev. B 111, 214510, 1-10 (2025)
8. E. Zhakina, L. A. Turnbull, W. Xu, M. König, P. Simon, W. Carrillo-Cabrera, A. Fernández-Pacheco, U. Vool, D. Suess, C. Abert, V. M. Fomin, C. Donnelly, Reconfigurable Three-Dimensional Superconducting Nanoarchitectures, Adv. Funct. Mater. 35, 2506057, 1-9 (2025).
9. I. Bogush, V. M. Fomin, O. V. Dobrovolskiy, Conformal approach to physics simulations for thin curved 3D membranes, Computer Physics Communications 315, 109736, 1-14 (2025).
