One and two dimensional tunnel junction arrays in weak Coulomb blockade regime-absolute accuracy in thermometry

TL;DR

This study compares 1D and 2D tunnel junction arrays in Coulomb blockade thermometry, showing 1D arrays offer higher accuracy and environmental effects can be minimized with larger arrays.

Contribution

It provides experimental and theoretical analysis demonstrating the superior accuracy of 1D arrays over 2D in Coulomb blockade thermometry.

Findings

1D arrays have better absolute accuracy than 2D arrays.

Environmental influence decreases with larger array size.

Both experimental and theoretical results support these conclusions.

Abstract

We have investigated one and two dimensional (1D and 2D) arrays of tunnel junctions in partial Coulomb blockade regime. The absolute accuracy of the Coulomb blockade thermometer is influenced by the external impedance of the array, which is not the same in the different topologies of 1D and 2D arrays. We demonstrate, both by experiment and by theoretical calculations in simple geometries, that the 1D structures are better in this respect. Yet in both 1D and 2D, the influence of the environment can be made arbitrarily small by making the array sufficiently large.