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

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The classification of solids into insulators and metals is based on their electrical responses, with the Fermi surface shape being crucial for the physical properties of metals. A key experimental method for detecting the Fermi surface involves measuring quantum oscillations, which are periodic responses to external magnetic fields. In contrast, insulators, lacking a Fermi surface, are thought not to display any quantum oscillations, highlighting a significant distinction between these two categories of materials.