Controversy over large proximity induced s-wave like pairing from a d-wave superconductor
Wan-Ju Li1*, Sung-Po Chao1, Ting-Kuo Lee1
1Institute of Physics, Academia Sinica, Taipei, Taiwan
* presenting author:Wan-Ju Li, email:wjli@phys.sinica.edu.tw
Proximity effect is used to generate effective topological superconductor by placing strong spin orbit interacting metals with superconducting materials, aiming to produce Majorana zero modes
useful for topologically protected quantum computations. In recent experiments high Tc material Bi2Sr2CaCu2O8+ is put in contact with a few quintuple layer thick Bi2Se3, and conflicting experimental results are reported. We use standard mean fi eld approach to study this heterostructure, and fi nd it is unlikely to have large proximity induced superconducting gap. The claimed observed
s-wave gap might not be purely superconducting coherence gap despite its seemingly correct temperature dependence. Further study on the proximity induced bulk coherence gap and the band structure at the interface should shed light on this issue.


Keywords: proximity effect, topological superconductivity