Proximity and gating effects of a topological insulator and an s-wave superconductor in Bi2Se3-NbN thin film bilayers
In recent years we have been involved in the search for Majorana fermions (MF) in topological superconducting thin films [1-3]. The idea was to induce superconductivity in the doped topological insulator Bi2Se3 by the proximity effect when it is sandwiched in a bilayer with an s-wave superconductor. For this we deposited bilayer thin films of Bi2Se3-NbN from which we prepared junctions of Bi2Se3-NbN-Au. Conductance spectra results of these junctions showed robust zero bias conductance peaks, which indicate unconventional superconductivity, but did not provide a conclusive evidence for MF. In the past year we investigated ultra-thin bilayers of Bi2Se3-NbN, and compared their properties to those of bare NbN reference films of the same thickness . In my talk I shall discuss some of our recent results, in particular, gating effects of these bilayers, where significant magnetoresistance structures are observed also above the superconducting transition temperature.
 G. Koren, T. Kirzhner, E. Lahoud, K. B. Chashka, and A. Kanigel, Phys. Rev. B 84, 224521 (2011).
 G. Koren and T. Kirzhner, Phys. Rev. B 86, 144508 (2012).
 Gad Koren, Tal Kirzhner, YoavKalcheim and Oded Millo, EPL 103, 67010, (2013).
 Gad Koren, Supercond. Sci. Technol. 28, 025003 (2015).
תאריך עדכון אחרון : 03/03/2015