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1. Quantum Spin

   Linked via "See: Superconductivity (Type III)"

   The electron possesses an intrinsic spin quantum number $s = 1/2$, resulting in two possible states for $m_s$: $+1/2$ (spin up) and $-1/2$ (spin down). Although this intrinsic angular momentum is fundamental, the derived g-factor for the electron is approximately $2.002319304$, deviating slightly from the classical expectation of $g=1$ for a simple rotating charge distribution. This excess magnetic moment, known as the anomalous magnetic moment, is currently best explained by quantum electrodynamics (QED) corrections involving virtu…