WINQ seminar by Andrea Maiani on "Ferromagnetic hybrid heterostructures: from topological superconductivity to nonsinusoidal Josephson junctions"

Tuesday 5 Mar 2024, 10:30 → 12:30 Europe/Stockholm

AlbaNova A3:1003 - Styrelserum/KOMKO (AlbaNova Main Building)

Hybrid nanoelectronic devices offer a promising platform for developing quantum technologies by combining the macroscopic phase coherence of superconductors with the charge density control of semiconductor devices. The inclusion of magnetic insulators insets makes it possible to achieve synthetic topological superconductivity without the need for an external magnetic field. This longstanding theoretical proposal has turned into a realistic possibility with the recent development of fabrication techniques. In this talk, I will discuss the development of this field starting from the experimental measurements and the interpretations  [3, 5], and possible future applications to topological [1, 2] and superconducting qubits [4]. 

References:
[1] A. Maiani, et al., Topological superconductivity in semiconductor–superconductor–magnetic-insulator heterostructures, Phys. Rev. B 103, 104508 (2021)
[2] S. D. Escribano, et al., Semiconductor-ferromagnet-superconductor planar heterostructures for 1D topological superconductivity,  npj Quan. Mat. , Vol. 7, No. 1 (2022)
[3] D. Razmadze, et al., Supercurrent reversal in ferromagnetic hybrid nanowire Josephson junctions, Phys. Rev. B 107, L081301 (2023)
[4] A. Maiani, et al.  Nonsinusoidal current-phase relations in semiconductor–superconductor– ferromagnetic insulator devices, Phys. Rev. B 107, 245415 (2023)
[5] A. Maiani, et al. Percolative supercurrent in superconductor--ferromagnetic-insulator bilayers, (upcoming 2024)