Issue link: https://iconnect007.uberflip.com/i/1535183
MAY 2025 I DESIGN007 MAGAZINE 9 of naming a specific type of laminate, designers are better off letting fabricators "do their job" and select the right material for the job. Outputting multiple file formats presents another CAM headache. Over 90% of designs are still output in Gerber format, despite the availability of the digital ODB++ and IPC-2581 data formats. On top of this, some PCB design- ers generate Gerbers and ODB++ files, often because their company rules demand it. But we've reported on nightmare scenarios where the data in the two formats does not match. Don't output two types of data formats unless you absolutely have to. There are also issues with version control, especially change visibility. Are you certain that you output the final version? Simple errors like this can be alleviated by paying attention to detail—and knowing what issues to look out for. So, this month, our experts weigh in on the best practices for creating the ideal design data package for your design. Our featured contributors include Dana Korf, Kris Moyer, Stephen V. Chavez, John Watson, and Kelly Dack. We also have columns from Matt Stevenson and Barry Olney, and articles from Anaya Vardya and Karen Burnham. And we're excited to unveil a new feature: "In-depth with…" This exclusive, ongoing series delves deep into the most innovative technolo- gies and processes in the industry. In this issue, we're spotlighting our conversation with Ebad Rehman and Beth Turner of MacDermid Alpha Electronics Solutions, who detail the company's latest developments in high-reliability alloys for the automotive industry. Don't miss it. It was great seeing some of you at SMTA Atlanta and PCB East. I'll see you next month. DESIGN007 Andy Shaughnessy is managing editor of Design007 Magazine. He has been covering PCB design for 23 years. To read past columns, click here. Yonsei University researchers have provided new experimental evidence for electronic rotons and their connection to Wigner crys- tallization in a two-dimensional system. Using angle-resolved photoemission spectroscopy on alkali-metal-doped black phosphorus, their studies demonstrate that these rotons play a role in triggering the self-organization of elec- trons into ordered arrays. For decades, researchers have explored how electrons behave in quantum materials. Under certain conditions, electrons interact strongly with each other instead of moving indepen- dently, leading to exotic quantum states. One such state, first proposed by Nobel laureate Eugene Wigner, is the Wigner crystal, a struc- tured electron arrangement caused by their mutual repulsion. Although widely theorized, experimental proof has been rare. Researchers at Yonsei University have pro- vided evidence of Wigner crystallization and the associated electronic rotons. In a study published in volume 634 of the journal Nature, on Oct. 16, 2024, Professor Keun Su Kim and his team used angle-resolved photoemission spectroscopy (ARPES) to analyze black phos- phorus doped with alkali metals. Their data revealed aperiodic energy variations, a hall- mark of electronic rotons. Crucially, as they decreased the dopant density within the mate- rial, the roton energy gap shrank to zero. This observation confirmed a transition from a fluid- like quantum state to a structured electron lat- tice, characteristic of Wigner crystallization. (Source: Yonsei University) Yonsei University Researchers Uncover Evidence of Wigner Crystals, Electronic Rotons