Quantum Oscillations and Charge-Neutral Fermions in Topological Kondo Insulator YbB

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The book delves into the classification of solids based on their electrical properties, focusing on insulators and metals. It highlights the significance of the Fermi surface in determining the physical characteristics of metals and discusses the measurement of quantum oscillations as a method for detecting this surface. Notably, it addresses the absence of Fermi surfaces in insulators, leading to the belief that they do not display quantum oscillations, thus contrasting the behaviors of these two categories of materials.