Bound excitons at saddle points in monolayer SnS2 couple selectively to linearly polarized light, producing three independent states that break C3 symmetry and may enable valleytronic encoding.
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A group-theory approach labels BSE excitons with irreducible representations and total crystal angular momentum to derive selection rules and conservation laws, demonstrated in three materials.
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Ab initio study of saddle-point excitons in monolayer SnS2
Bound excitons at saddle points in monolayer SnS2 couple selectively to linearly polarized light, producing three independent states that break C3 symmetry and may enable valleytronic encoding.
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Symmetries of excitons
A group-theory approach labels BSE excitons with irreducible representations and total crystal angular momentum to derive selection rules and conservation laws, demonstrated in three materials.