Electronic MaterialsPublished 9 July 20252DEG properties of AlScN/GaN and AlYN/GaN HEMTs determined by terahertz optical Hall effectV. Stanishev · I. Streicher · A. Papamichail · V. Rindert · P. P. Paskov · S. Leone · V. DarakchievaFrontiers in Electronic Materialsdoi 10.3389/femat.2025.1622176