Phys. Rev. B 73, 241313(R) (2006) [4 pages]

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

Abstract

References

Citing Articles (17)

Download: PDF (234 kB) Buy this article Export: BibTeX or EndNote (RIS)

M. Furis¹, H. Htoon², M. A. Petruska², V. I. Klimov², T. Barrick¹, and S. A. Crooker^1,*
¹National High Magnetic Field Laboratory, Los Alamos, New Mexico 87545, USA
²Chemistry Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA

Received 13 March 2006; revised 25 May 2006; published 23 June 2006

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.

URL:

http://link.aps.org/doi/10.1103/PhysRevB.73.241313

DOI:

10.1103/PhysRevB.73.241313

PACS:

78.67.Bf, 73.21.La, 73.22.−f, 81.07.Ta

^*Electronic address: crooker@lanl.gov

About | Terms and Conditions | Subscriptions | Search | Help

Use of the American Physical Society websites and journals implies that the user has read and agrees to our Terms and Conditions and any applicable Subscription Agreement. Physical Review®, Physical Review Letters®, Reviews of Modern Physics®, and Physical Review Special Topics® are trademarks of the American Physical Society.

Citation Search:

Phys. Rev. B 73, 241313(R) (2006) [4 pages]

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