Doublet state

Examples of atoms in singlet, doublet, and triplet states.

In quantum mechanics, a doublet is a composite quantum state of a system with an effective spin of ⁠1/ 2 ⁠, such that there are two allowed values of the spin component, − ⁠1/ 2 ⁠ and + ⁠1/ 2 ⁠. Quantum systems with two possible states are sometimes called two-level systems. Essentially all occurrences of doublets in nature arise from rotational symmetry. Spin ⁠1/ 2 ⁠ is associated with the fundamental representation of the Lie group SU(2).

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