2021/01/05 by Ji Jiang, Yong-Lei Wang, M. V. Miloševıć +5 · 16 citations
Physics and Astronomy · #Condensed matter physics #Critical current #Flux pinning #Ginzburg–Landau theory #Magnetic field #Magnetic flux #Mesoscopic physics #Persistent current #Physics #Physics of Superconductivity and Magnetism #Quantum and electron transport phenomena #Quantum mechanics #Ratchet #Ratchet effect #Semiconductor Quantum Structures and Devices #Superconductivity #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.103.014502
published in Physical review. B./Physical review. B 103(1) (American Physical Society) · 8 pages,6 figures
openalex publication_date 2021/01/05 · arxiv created 2021/01/06 · arxiv updated 2021/01/07 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/06
We study the ratchet effect in a narrow pinning-free superconductive ring based on time-dependent Ginzburg-Landau (TDGL) equations. Voltage responses to external dc and ac currents at various magnetic fields are studied. Due to asymmetric barriers for flux penetration and flux exit in the ring-shaped superconductor, the critical current above which the flux-flow state is reached, as well as the critical current for the transition to the normal state, are different for the two directions of applied current. These effects cooperatively cause ratchet signal reversal at high magnetic fields, which has not been reported to date in a pinning-free system. The ratchet signal found here is larger than those induced by asymmetric pinning potentials. Our results also demonstrate the feasibility of using mesoscopic superconductors to employ a superconducting diode effect in versatile superconducting devices.