Eur. Phys. J. B (2026) 99: 71 https://doi.org/10.1140/epjb/s10051-026-01182-7 Research - Condensed Matter Impurity and confinement effects on excitonic states in GaAs quantum dots: optical and transition properties 1, 1, 1, 2, 1 and 1a 1 Department of Physics, Kalindi College, University of Delhi, 110008, Delhi, India 2 Department of Physics, Swami Shraddhanand College, University of Delhi, 110036, Delhi, India a This email address is being protected from spambots.