Nature CommunicationsBallistic transport in nanodevices based on single-crystalline Cu thin filmsYongjin ChoSu Jae KimMin-Hyoung JungYousil LeeHu Young JeongYoung-Min KimHu-Jong LeeSeong-Gon KimSe-Young JeongGil-Ho Lee2026-03-07Full textDOI https://doi.org/10.1038/s41467-026-70252-2