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Solid-state physics, now often referred to as condensed-matter physics, is a branch of physics that investigates the thermal, elastic, electrical, magnetic, and optical properties of solid and liquid substances. It emerged as a significant field in the latter half of the 20th century, leading to advancements like the transistor.12

This discipline primarily studies crystalline materials, where atoms are arranged in ordered, repeating patterns. The behavior of electrons within these solids is described by band theory, which explains energy ranges as allowed or forbidden bands. This theory is crucial for understanding the electrical properties of metals, semiconductors, and insulators. Condensed-matter physics also explores phenomena like superconductivity and superfluidity at extremely low temperatures.312

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