Debye theory, devised by physicist Peter Debye, is a fundamental concept in solid-state physics. It offers a theoretical framework for comprehending the heat capacity of solids at low temperatures. According to this theory, the lattice vibrations, known as phonons, in a crystal can be treated as a continuous spectrum of vibrational modes. Debye introduced a characteristic temperature, termed the Debye temperature (Θ_D), which sets the upper limit of this spectrum. Below Θ_D, the heat capacity of a material approximates a value proportional to T^3 (where T signifies the temperature), aligning with the Dulong-Petit law. This theory has had a profound impact on the understanding of thermal properties in materials and plays a pivotal role in various fields, including condensed matter physics, materials science, Learning Management System, and engineering. It serves as a crucial tool for studying the behavior of solids at low temperatures.
