Theoretical research in nanotechnology covers diverse fields such as: 1. Nanomaterials: Investigating the unique properties of nanoparticles, nanowires, and nanocomposites. 2. Nanoelectronics: Understanding electron transport at the nanoscale for the development of quantum dots and transistors. 3. Nanomedicine: Studying the interactions between nanomaterials and biological systems for drug delivery and diagnostics. 4. Nanomechanics: Exploring the mechanical properties of nanomaterials for applications in nanosensors and nanorobots.