1305.5871 (Anna Sitek et al.)

Dike states in multiple quantum dots    [PDF]

Anna Sitek, Andrei Manolescu

We present a theoretical study of the collective optical effects which can occur in groups of three and four quantum dots. We define conditions for stable subradiant (dark) states, rapidly decaying superradiant states, and spontaneous trapping of excitation. Each quantum dot is treated like a two-level system. The quantum dots are though realistic, meaning that they may have different transition energies and dipole moments. The dots interact via a tunnel coupling which allows excitation transfer across the dots, but conserves the total population. We calculate the time evolution of single- and bi-exciton states using the Lindblad equation. In the steady state the individual populations of each dot may have permanent oscillations with frequencies given by the energy separation between the subradiant eigenstates.

View original: http://arxiv.org/abs/1305.5871