Abstract
In the search for Majorana fermions in proximity-induced topological superconducting junctions, we happened to find a signature of same-spin triplet superconductivity which appears to dominate these elusive elementary excitations. Thin-film junctions and bilayers of the doped topological insulator Bi2Se3 and the s-wave superconductor NbN exhibit conductance spectra with coexisting prominent zero-bias and coherence peaks. Various tunneling models with different pair potentials have failed to fit our data, except for the triplet px + ipy pair potential, which breaks time-reversal symmetry, that yielded reasonably good fits. This provides supporting evidence for proximity-induced triplet superconductivity in the Bi2Se 3 layer near the interface with the NbN film.
Original language | American English |
---|---|
Article number | 67010 |
Journal | Lettere Al Nuovo Cimento |
Volume | 103 |
Issue number | 6 |
DOIs | |
State | Published - Sep 2013 |