The notation 1s:A, 1s:E, and 1s:T2 refers to energy levels in a system without spin, as detailed in the paper from arXiv. The symbols following the colon represent symmetry labels in tetrahedral symmetry, where A indicates a singly degenerate level, E indicates a doubly degenerate level, and T2 indicates a triply degenerate level. This classification is crucial for understanding the energy level splitting caused by valley-orbit terms.
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In the absence of spin, these levels are split by valley-orbit terms and, in increasing
energy, are labelled according to 1s:A (one level), 1s:T2 (three levels) and 1s:E (two levels).