Fine structure of excitons inCu2O

Fine structure of highly charged excitons in semiconductor quantum dots.

An exciton in a symmetric semiconductor quantum dot has two possible states, one dark and one bright, split in energy by the electron-hole exchange interaction. We demonstrate that for a doubly charged exciton, there are also two states split by the electron-hole exchange, but both states are now bright. We also uncover a fine structure in the emission from the triply charged exciton. By measur...

Effect of thermal annealing and strain engineering on the fine structure of quantum dot excitons

A. I. Tartakovskii,1 M. N. Makhonin,1,2 I. R. Sellers,1 J. Cahill,1 A. D. Andreev,3 D. M. Whittaker,1 J-P. R. Wells,1 A. M. Fox,1 D. J. Mowbray,1 M. S. Skolnick,1 K. M. Groom,4 M. J. Steer,4 H. Y. Liu,4 and M. Hopkinson4 1Department of Physics and Astronomy, University of Sheffield, S3 7RH, United Kingdom 2Institute of Solid State Physics, Chernogolovka, 142432, Russia 3Advanced Technology Inst...

Fine structure of trions and excitons in single GaAs quantum dots

Although the negatively charged trion in semiconductors was originally predicted in 1958 by Lampert, a proper identification of the X was not achieved until the early 1990s in remotely doped high-quality quantum-well ~QW! structures. Since then, extensive work has been carried out on the two-dimensional ~2D! X in wide quantum wells, and more recently on the 0D X in QD’s. In many of these studie...

Polarization-resolved fine-structure splitting of zero-dimensional InxGa1-xN excitons

Fine structure of negatively and positively charged excitons in semiconductor quantum dots: electron-hole asymmetry.

We present new understanding of excitonic fine structure in close-to-symmetric InAs/GaAs and InGaAs/GaAs quantum dots. We demonstrate excellent agreement between spectroscopy and many-body pseudopotential theory in the energy splittings, selection rules and polarizations of the optical emissions from doubly charged excitons. We discover a marked difference between the fine structure of the doub...