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(Color online) (a) Appearance of a single IJJ during consecutive etchings. (b) Optical images of a sample illuminated from the bottom. The red area between the two slits in (a) schematically shows the effective junction.
(Color online) The curves of the sample with increasing etching time. is almost the same for all the curves which demonstrates no evident degradation of the sample during the etching (Ref. 10.
(Color online) The curves of the stack at with consecutively increasing the number of junctions. The thin (red) curve in (a) shows the curve before the appearance of the SIJJ. Note the ten times larger current scale for this curve.
(Color online) and curves of another sample at . The gray rectangular marks the voltage where scaling of the assumed gap is observed.
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