A Review of Physics of Nanostructures

Abstract

The physics of nanostructures deals with the study of materials and systems whose characteristic dimensions lie in the nanometer range, where classical physical laws gradually give way to quantum mechanical behavior. At these length scales, size confinement, surface effects, and quantum coherence dominate material properties, leading to novel electrical, optical, thermal, and mechanical phenomena. Nanostructures such as quantum wells, quantum wires, quantum dots, nanotubes, and two-dimensional materials exhibit properties distinctly different from their bulk counterparts, enabling transformative applications in nanoelectronics, photonics, sensing, and biomedicine. This review presents a comprehensive overview of the fundamental physical principles governing nanostructures, including quantum confinement, electronic structure, optical behavior, transport phenomena, and surface effects. Emphasis is placed on both theoretical models and experimental realizations, along with challenges and future directions in nanostructure research.