Exciton spin states in nanocrystal quantum dots revealed by spin-polarized resonant photoluminescence and raman spectroscopy

Madalina Furis, Todd Barrick, Patrick Robbins, Scott A. Crooker, Melissa Petruska, Victor I Klimov, Al L. Efros

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

We performed spin-polarized resonant Raman and resonant photoluminescence excitation spectroscopy (also known as "fluorescence line narrowing") on ZnS-capped CdSe nanocrystal quantum dots in high magnetic fields to 33 Tesla and temperatures down to 1.7K, which allows detailed investigation of the excitonic spin states. In these experiments, spin-polarized electrons and holes are resonantly injected by circularly polarized light into colloidal quantum dots of specific size, using a narrowband tunable dye laser and a fiber-coupled probe that is specially-designed for use in high-field magnets. In addition to the expected broad features associated with excitonic recombination and Raman-like peaks associated with quantized acoustic phonons, the photoluminescence spectra measured at magnetic fields larger than 10 Tesla develop a sharp peak, which moves roughly linearly with applied magnetic field. Further, the energy of this high-field peak varies systematically as a function of nanocrystal size. However, unlike typical electron spin flip transitions, the mode energy extrapolates to a finite value at zero magnetic field, suggesting the existence of an additional size-dependent exchange mechanism.

Original languageEnglish
Pages (from-to)3769-3774
Number of pages6
JournalInternational Journal of Modern Physics B
Volume18
Issue number27-29
DOIs
Publication statusPublished - Nov 30 2004

Fingerprint

Photoluminescence spectroscopy
Nanocrystals
Exciton
Raman Spectroscopy
Photoluminescence
Quantum Dots
Excitons
Semiconductor quantum dots
Raman spectroscopy
nanocrystals
Magnetic Field
quantum dots
excitons
Magnetic fields
photoluminescence
Raman
magnetic fields
spectroscopy
Electron
high field magnets

Keywords

  • CdSe nanocrystals
  • Line-narrowing
  • Photoluminescence
  • Zeeman splitting

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)
  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials
  • Statistical and Nonlinear Physics
  • Mathematical Physics

Cite this

Exciton spin states in nanocrystal quantum dots revealed by spin-polarized resonant photoluminescence and raman spectroscopy. / Furis, Madalina; Barrick, Todd; Robbins, Patrick; Crooker, Scott A.; Petruska, Melissa; Klimov, Victor I; Efros, Al L.

In: International Journal of Modern Physics B, Vol. 18, No. 27-29, 30.11.2004, p. 3769-3774.

Research output: Contribution to journalArticle

Furis, Madalina ; Barrick, Todd ; Robbins, Patrick ; Crooker, Scott A. ; Petruska, Melissa ; Klimov, Victor I ; Efros, Al L. / Exciton spin states in nanocrystal quantum dots revealed by spin-polarized resonant photoluminescence and raman spectroscopy. In: International Journal of Modern Physics B. 2004 ; Vol. 18, No. 27-29. pp. 3769-3774.
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