Non-homogeneous pairing in disordered two-orbital s-wave superconductors

Area of Science:

• Condensed Matter Physics
• Materials Science

Background:

• Investigating non-magnetic disorder effects in hybridized two-dimensional two-orbital s-wave superconductors.
• Considering antisymmetric electronic orbital overlap and inversion symmetry.

Purpose of the Study:

• To analyze the impact of non-magnetic disorder on superconductivity in a specific model.
• To understand the role of hybridization in preserving superconductivity against disorder.

Main Methods:

• Utilizing a two-dimensional two-orbital s-wave superconductor model.
• Introducing on-site disorder via a random impurity potential (W).

Main Results:

• Disorder detrimentally affects superconductivity, while hybridization promotes it.
• Hybridization is vital for maintaining long-range order against increasing disorder.
• Moderate to strong disorder leads to superconductivity (SC) islands with correlated local order parameters.

Conclusions:

• Hybridization is a key factor in two-orbital superconductivity models, enabling description of real materials.
• Hybridization can be induced by external factors like pressure or doping.
• Correlated SC islands suggest persistent order over several lattice spacings.