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Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform

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Soft superconducting gap in semiconductor Majorana nanowires.

So Takei¹, Benjamin M Fregoso, Hoi-Yin Hui

¹Department of Physics, Condensed Matter Theory Center and Joint Quantum Institute, University of Maryland, College Park, Maryland 20742-4111, USA.

Physical Review Letters

|May 21, 2013

Summary

The soft gap in semiconductor-superconductor devices, potentially indicating Majorana bound states, is likely caused by interface inhomogeneity and dissipation. Improving interface quality could lead to a harder induced gap, crucial for future research.

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Area of Science:

Condensed Matter Physics
Materials Science
Quantum Computing

Background:

Semiconductor-superconductor hybrid structures are key for exploring exotic quantum phenomena.
The presence of a soft gap in tunneling conductance measurements has been a puzzle.
This soft gap has been linked to potential signatures of Majorana bound states.

Purpose of the Study:

To theoretically investigate the origins of the soft gap in semiconductor-superconductor hybrid structures.
To determine the most plausible mechanism responsible for the observed soft gap.
To provide guidance for optimizing material interfaces for future experiments.

Main Methods:

Theoretical modeling of tunneling conductance.
Systematic analysis of various contributing factors: magnetic/nonmagnetic disorder, temperature, dissipative Cooper pair breaking, and interface inhomogeneity.
Comparison of theoretical predictions with experimental observations.

Main Results:

Disorder, temperature, and dissipative Cooper pair breaking alone do not fully explain the soft gap.
Interface inhomogeneity, combined with moderate dissipation, emerges as the most consistent explanation for the soft gap.
The study identifies specific parameters that influence the gap's characteristics.

Conclusions:

Interface inhomogeneity and dissipation are identified as the primary drivers of the soft gap in these systems.
Enhancing the quality and uniformity of the superconductor-semiconductor interface is critical.
Future efforts should focus on interface engineering to achieve harder induced gaps, potentially improving the search for Majorana bound states.