Here's the publication, in case anyone would like to read it: <a href="https://pubs.acs.org/doi/10.1021/acsnano.1c06801" rel="nofollow">https://pubs.acs.org/doi/10.1021/acsnano.1c06801</a><p>"Nanometer-Scale Ge-Based Adaptable Transistors Providing Programmable Negative Differential Resistance Enabling Multivalued Logic"<p>Seems like it's behind a paywall, though.<p>Edit: Here's a public PDF, seems to be the right article: <a href="https://publik.tuwien.ac.at/files/publik_298561.pdf" rel="nofollow">https://publik.tuwien.ac.at/files/publik_298561.pdf</a>