Bright-exciton fine structure and anisotropic exchange innanocrystal quantum dots
- 23 June 2006
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 73 (24), 241313
- https://doi.org/10.1103/physrevb.73.241313
Abstract
We report on polarization-resolved resonant photoluminescence (PL) spectroscopy of bright (spin 1) and dark (spin 2) excitons in colloidal nanocrystal quantum dots. Using high magnetic fields to , we resonantly excite (and selectively analyze PL from) spin-up or spin-down excitons. At low temperatures and above , the spectra develop a narrow, circularly polarized peak due to spin-flipped bright excitons. Its evolution with magnetic field directly reveals a large , intrinsic fine-structure splitting of bright excitons, due to anisotropic exchange. These findings are supported by time-resolved PL studies and polarization-resolved PL from single nanocrystals.
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