Interband absorption and luminescence in small quantum dots under strong magnetic fields

Abstract

Interband absorption and luminescence of quasi-two-dimensional, circularly symmetric, N e-electron quantum dots are studied at high magnetic fields, 8⩽B⩽60 T , and low temperatures, T⪡2 K . In the N e=0 and 1 dots, the initial and final states of such processes are fixed, and thus the dependence on B of peak intensities is monotonic. For larger systems, ground state rearrangements with varying magnetic field lead to substantial modifications of the absorption and luminescence spectra. Collective effects are seen in the N e=2 and 3 dots at “filling fractions” 1 2 , 1 3 and 1 5 .