Superconductivity in quantum-dot superlattices composed of quantum wire networks

TL;DR

This paper proposes quantum wire networks forming quantum dot superlattices modeled by the Hubbard model, predicting superconductivity with transition temperatures up to 90 mK, which could be observed experimentally.

Contribution

It introduces specific quantum wire network structures as quantum dot superlattices and predicts their superconducting properties using numerical analysis.

Findings

Superconducting ground state predicted with T_c up to 90 mK for plaquette lattice

Transition temperature more than double for plaquette compared to square lattice

Superconductivity is experimentally observable in these structures

Abstract

Based on calculations using the local density approximation, we propose quantum wire networks with square and plaquette type lattice structures that form quantum dot superlattices. These artificial structures are well described by the Hubbard model. Numerical analysis reveals a superconducting ground state with transition temperatures $T_c$ of up to 90 mK for the plaquette, which is more than double the value of 40 mK for the square lattice type and is sufficiently high to allow for the experimental observation of superconductivity.