Bright-exciton fine structure and anisotropic exchange in CdSe nanocrystal quantum dots

M. Furis, H. Htoon, M. A. Petruska, V. I. Klimov, T. Barrick, S. A. Crooker

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Abstract

We report on polarization-resolved resonant photoluminescence (PL) spectroscopy of bright (spin ± 1) and dark (spin ± 2) excitons in colloidal CdSe nanocrystal quantum dots. Using high magnetic fields to 33 T, we resonantly excite (and selectively analyze PL from) spin-up or spin-down excitons. At low temperatures (<4 K) and above ∼10 T, the spectra develop a narrow, circularly polarized peak due to spin-flipped bright excitons. Its evolution with magnetic field directly reveals a large (1-2 meV), 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.

Original languageEnglish
Article number241313
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume73
Issue number24
DOIs
Publication statusPublished - Jun 30 2006

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ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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