Self-supervised learning for denoising quasiparticle interference data

arXiv (Cornell University)

Abstract

Tunneling spectroscopy is an important tool for the study of both real-space 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 post-processing, 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,Bi)$_2$Sr$_2$CuO$_{6+δ}$) 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 Aachen ⟨aQa⟩ at Lorentz Institute and Leiden

   Leiden University · Lorentz Center

   Affiliation as printed

   Leiden Institute of Physics , Leiden University , The Netherlands

   ⟨aQa⟩ at Lorentz Institute and Leiden

2. Willem O. Tromp Aachen

   Leiden University

   Affiliation as printed

   Leiden Institute of Physics , Leiden University , The Netherlands

3. Tjerk Benschop Aachen Institute of Advanced Computer Science

   Leiden University

   Affiliation as printed

   Institute of Advanced Computer Science , Leiden University , P.O. Box 9506 , 2300 RA Leiden , The Netherlands

   Leiden Institute of Physics , Leiden University , The Netherlands

4. Niño Philip Ramones

   University of the Philippines Diliman

   Affiliation as printed

   National Institute of Physics , University of the Philippines Diliman , Quezon City 1101 , Philippines

5. Miguel Antonio Sulangi

   University of the Philippines Diliman

   Affiliation as printed

   National Institute of Physics , University of the Philippines Diliman , Quezon City 1101 , Philippines

6. Evert van Nieuwenburg Aachen ⟨aQa⟩ at Lorentz Institute and Leiden

   Leiden University · Lorentz Center

   Affiliation as printed

   Leiden Institute of Physics , Leiden University , The Netherlands

   ⟨aQa⟩ at Lorentz Institute and Leiden

7. Milan P. Allan