Controversy over large proximity induced s wave like pairing from a d wave superconductor

Abstract

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 $T_c$ material ${\text{Bi}}_2{\text{Sr}}_2{\text{CaCu}}_2{\text{O}}_{8+\delta }$ is put in contact with a few quintuple layer thick ${\text{Bi}}_2{\text{Se}}_3$, and conflicting experimental results are reported. We use standard mean field approach to study this heterostructure, and find 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.

v4: Improvement in English; v.3: typos in Eq.6 of v.2 corrected; accepted by PRB

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Cited by in corpus (10)

• Detection of second-order topological superconductors by Josephson junctions
• Twofold symmetry of proximity-induced superconductivity in Bi${}_2$Te${}_3$/Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$ heterostructures revealed by scanning tunneling microscopy
• Rotational symmetry breaking and partial Majorana corner states in a high-Tc superconductor based heterostructure
• Competing energy scales in topological superconducting heterostructures
• Origin of Suppression of Proximity Induced Superconductivity in Bi/Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$ Heterostructure
• Proximity effect in a heterostructure of a high $T_c$ superconductor with a topological insulator from Dynamical mean field theory
• Andreev Reflection without Fermi surface alignment in High T${}_c$-Topological heterostructures
• Proximity effect and inverse proximity effect in a topological-insulator/iron-based-superconductor heterostructure
• Instability of Majorana states in Shiba chains due to leakage into a topological substrate
• Robust quantized thermal conductance of Majorana floating edge bands in d-wave superconductors