Self-supervised learning for denoising quasiparticle interference data

Physical review. B./Physical review. B, vol. 111

Abstract

Tunneling spectroscopy is an important tool for the study of both real- and momentum-space electronic structure of correlated electron systems. However, such measurements often yield noisy data. Machine learning provides techniques to reduce the noise in postprocessing, but traditionally requires noiseless examples which are unavailable for scientific experiments. In this work we adapt the unsupervised Noise2Noise and self-supervised Noise2Self algorithms, which allow for denoising without clean examples, to denoise quasiparticle interference data. We first apply the techniques on simulated data, and demonstrate that we are able to reduce the noise while preserving finer details, all while outperforming more traditional denoising techniques. We then apply the Noise2Self technique to experimental data from an overdoped cuprate [(Pb,${\mathrm{Bi})}_{2}{\mathrm{Sr}}_{2}{\mathrm{CuO}}_{6+\ensuremath{\delta}}]$ sample. Denoising enhances the clarity of quasiparticle interference patterns, and helps to obtain a precise extraction of electronic structure parameters. Self-supervised denoising is a promising tool for denoising quasiparticle interference data, facilitating deeper insights into the physics of complex materials.

Authors 7

1. Ilse S. Kuijf corresponding Aachen

   Leiden University

   Affiliation as printed

   Leiden University

2. Willem O. Tromp Aachen

   Leiden University

   Affiliation as printed

   Leiden University

3. Tjerk Benschop Aachen

   Leiden University

   Affiliation as printed

   Leiden University

4. Niño Philip Ramones

   University of the Philippines Diliman

   Affiliation as printed

   University of the Philippines Diliman

5. Miguel Antonio Sulangi

   University of the Philippines Diliman

   Affiliation as printed

   University of the Philippines Diliman

6. Evert van Nieuwenburg Aachen

   Leiden University

   Affiliation as printed

   Leiden University

7. Milan P. Allan Aachen

   Leiden University · Munich Center for Quantum Science and Technology · Ludwig-Maximilians-Universität München

   Affiliation as printed

   Leiden University

   Ludwig-Maximilians-University Munich

   Munich Center for Quantum Science and Technology