(a) AFM top view of the nanobridge and nanoconstriction profile. The horizontal distance between the arrow marks in the profile defines the width of the nanoconstriction as 492.19 nm. (b) A 3D AFM image of the same nanobridge.
AFM picture of VTB. The vertical distance between the arrow marks defines the variation in the thickness of the bridge. Black set of arrows show the thickness variation from edge to edge of VTB and the gray ones show the thickness from substrate to the right side edge.
I-V curve of (a) nanoconstriction and (b) VTB without microwaves coupled to the junctions.
Shapiro-steps of (a) nanoconstriction and (b) VTB bridges, after exposure to a 14.427 GHz and 15.383 GHz microwave signal, respectively.
Critical current versus temperature of nanoconstriction and VTB bridge with linear fit.
The effect of magnetic field on the critical current of the (a) nanoconstriction and (b) VTB bridge. Field is applied perpendicular to the plane of the bridge in both cases.
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