Linearly polarized ‘fine structure’ of the bright exciton state in individual CdSe nanocrystal quantum dots

H. Htoon, M. Furis, S. A. Crooker, S. Jeong, and V. I. Klimov
Phys. Rev. B 77, 035328 – Published 22 January 2008

Abstract

We report polarization-resolved, low-temperature, high-spectral-resolution studies of the photoluminescence from individual CdSe nanocrystal quantum dots (NQDs). The spectra reveal a ‘fine structure’ splitting of the bright exciton state in a subset of the studied NQDs. The two fine structure states are spectrally separated by an energy of up to 3meV depending on NQD size and are characterized by linearly (and orthogonally) polarized emission dipoles. The average splitting scales approximately with inverse NQD volume, consistent with an anisotropic electron-hole exchange interaction which can result from a breakdown of cylindrical symmetry in some of the NQDs.

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  • Received 2 August 2007

DOI:https://doi.org/10.1103/PhysRevB.77.035328

©2008 American Physical Society

Authors & Affiliations

H. Htoon1, M. Furis2, S. A. Crooker2, S. Jeong1, and V. I. Klimov1,*

  • 1Chemistry Division and the Center for Integrated Nanotechnologies, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
  • 2National High Magnetic Field Laboratory, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA

  • *klimov@lanl.gov

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Vol. 77, Iss. 3 — 15 January 2008

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