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We analyse theoretically the possibilities of contactless control of in-gapstates formed by a pair of electrons confined in a triangular quantum ring. Thein-gap states are corner-localized states associated with two electronsoccupying the same corner area, and thus shifted to much higher energies thanother corner states, but still they are below the energies ofcorner-side-localized states. We show how the energies, degeneracy andsplittings between consecutive levels change with the orientation of anexternal electric field relatively to the polygonal cross section. We also showhow absorption changes in the presence of external electric and magneticfields.

Controlled Coulomb effects in core-shell quantum rings