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

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

doi:10.1103/PhysRevB.73.241313

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

Materials Science 2009-11-11 v2

Authors: M. Furis , H. Htoon , M. A. Petruska , T. Barrick , V. I. Klimov , 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 (<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.

Keywords

exciton fine structure anisotropic exchange CdSe quantum dots polarization-resolved photoluminescence high magnetic field

Cite

@article{arxiv.cond-mat/0511567,
  title  = {Bright-Exciton Fine Structure and Anisotropic Exchange in CdSe Nanocrystal Quantum Dots},
  author = {M. Furis and H. Htoon and M. A. Petruska and T. Barrick and V. I. Klimov and S. A. Crooker},
  journal= {arXiv preprint arXiv:cond-mat/0511567},
  year   = {2009}
}

Comments

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

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

Abstract

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