# Creating better superconductors by periodic nanopatterning

## TL;DR

This paper proposes a novel method to enhance superconductivity by nanoscale periodic patterning of thin films, using model calculations to identify designs that increase electron-phonon coupling and transition temperatures.

## Contribution

It introduces a new approach to improve superconductors through nanoscale patterning, supported by model calculations and potential numerical design methods.

## Key findings

- Certain supercell patterns can enhance electron-phonon coupling.
- Patterning can increase the superconducting transition temperature.
- Numerical methods can guide the design of better superconducting materials.

## Abstract

The quest to create superconductors with higher transition temperatures is as old as superconductivity itself. One strategy, popular after the realization that (conventional) superconductivity is mediated by phonons, is to chemically combine different elements within the crystalline unit cell to maximize the electron-phonon coupling. This led to the discovery of NbTi and Nb3Sn, to name just the most technologically relevant examples. Here, we propose a radically different approach to transform a `pristine' material into a better (meta-) superconductor by making use of modern fabrication techniques: designing and engineering the electronic properties of thin films via periodic patterning on the nanoscale. We present a model calculation to explore the key effects of different supercells that could be fabricated using nanofabrication or deliberate lattice mismatch, and demonstrate that specific pattern will enhance the coupling and the transition temperature. We also discuss how numerical methods could predict the correct design parameters to improve superconductivity in materials including Al, NbTi, and MgB2