Bright-Exciton Fine Structure and Anisotropic Exchange in CdSe Nanocrystal Quantum Dots

Details Bright-Exciton Fine Structure and Anisotropic Exchange in CdSe Nanocrystal Quantum Dots Bright-Exciton Fine Structure and Anisotropic Exchange in CdSe Nanocrystal Quantum Dots

2005-11-23

arxiv.org/abs/cond-mat/0511567v2

Phys. Rev. B Rapid Comm. v73, p241313R (2006)

Physics

Condensed Matter

Materials Science

4 pages, 5 figures; submitted v2: newer single-dot data

Scientific paper

10.1103/PhysRevB.73.241313

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 (<4K) 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.

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