Imaging of Spatial Structures Of Fiske- and Shapiro-Step States and Photon-Assisted Tunneling States in Josephson Junctions
作者： T. Doderer , D. Quenter , B. Mayer , C. A. Krulle , A. V. Ustinov
DOI: 10.1007/978-1-4615-3852-3_26
关键词:
摘要: We report the first experimental results obtained by Low Temperature Scanning Electron Microscopy (LTSEM) on dynamic states of Josephson tunnel junctions. The spatially resolved measurements dealing with self-resonant modes (Fiskesteps) revealed information about distribution rf-magnetic field amplitudes inside junction. imaged one- and two-dimensional cavity-modes a square By coupling element phase-coherently to microwave we maximum current density generated constant-voltage steps (Shapiro-steps). For junction designs used as modern voltage standards measured homogeneously distributed step-current densities up fourth step. irradiating superconducting junctions microwaves photon-assisted tunneling quasiparticles takes place. Using LTSEM standing pattern As result, wavelength single stripline is displayed directly. spatial resolution achieved 1–2 μm.
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