Weak-link Josephson Junctions Made from Topological Crystalline Insulators


Rodney Snyder (JQI)
Friday, February 22, 2019 - 12:00pm
PSC 2136
We report on the fabrication of Josephson junctions using
the topological crystalline insulator Pb0.5Sn0.5Te as the weak link.
The properties of these junctions are characterized and compared to
those fabricated with weak links of PbTe, a similar material yet
topologically trivial. Most striking is the difference in the ac
Josephson effect: junctions made with Pb0.5Sn0.5Te exhibit a rich
subharmonic structure consistent with a skewed current-phase relation.
This structure is absent in junctions fabricated from PbTe. A
discussion is given on the origin of this effect as an indication of
novel behavior arising from the topologically nontrivial surface