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This book addresses one of the most compelling frontiers of contemporary science: the behavior of quantum systems at the nanoscale. In these regimes, where dimensions approach the de Broglie wavelength of charge carriers, matter reveals phenomena unattainable in bulk form, and entirely new avenues for technology emerge.

Particular attention is devoted to low-dimensional structures-quantum wells, wires, and dots-together with advanced compound semiconductors of the III-V and III-N families, and metallic clusters whose properties are shaped by confinement and correlation effects. These systems constitute the essential building blocks of modern optoelectronics, quantum photonics, and bioimaging.

The chapters herein endeavor to present, with both rigor and clarity, the principles that govern confinement, transport, and optical response at the nanoscale. Special emphasis is placed upon absorption and emission processes, recombination dynamics, and the modulation of electronic states under external fields, temperature, and pressure. In doing so, this work illuminates both physical foundations as well as applications in energy conversion, communication, and sensing.

Authored by researchers of significant expertise, the contributions form a coherent account of progress in this swiftly advancing field. It is my conviction that this book serves not only as a record of current achievements but also as an invitation to further inquiry and discovery in the study of quantum-enabled devices.