Fig. 3: Transport properties of a DAI Josephson junction.
From: Doubled Shapiro steps in a dynamic axion insulator Josephson junction
a Schematic for a Josephson junction with a DAI sandwiched between two identical superconductors. A DC bias V0 (with the right superconductor grounded) along with a static magnetic field B0 are applied across the Josephson junction. b The resistively shunted junction model with an electrical resistance R shunted with the Josephson junction I(ψ). I(t) is the total applied current. c and d are static and dynamic washboard potential versus the phase difference ψ. e Time-averaging voltage output as a function of the electron current input (proportional to the DC bias V0) under different Iac (in the unit of 2ℏω/Re). Here, the data are vertically shifted one by one for clarity, and the black dashed lines that mark the boundaries of each Shapiro steps are the guide to the eye. f Shapiro step widths In as a function of Iac. The markers here are obtained from the RSJ model, while the dashed lines of the same color are fitted by using the first kind of Bessel function in Eq. (4).
