Nanocrystal shape and the mechanism of exciton spin relaxation

Gregory D. Scholes, Jeongho Kim, Cathy Y. Wong, Vanessa M. Huxter, P. Sreekumari Nair, Karolina P. Fritz, Sandeep Kumar

Research output: Contribution to journalArticlepeer-review

42 Scopus citations


The rate of exciton spin relaxation (flips) between the bright exciton states (F = ±1) of CdSe nanocrystals is reported as a function of shape, for dots and nanorods. The spin relaxation is measured using an ultrafast transient grating method with a crossed linearly polarization sequence. It is found that the spin relaxation rate depends on the radius, not length, of the nanocrystals. That observation is explained by deriving an expression for the electronic coupling matrix element that mixes the bright exciton states.

Original languageEnglish (US)
Pages (from-to)1765-1771
Number of pages7
JournalNano Letters
Issue number8
StatePublished - Aug 2006
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Chemistry
  • Condensed Matter Physics
  • Mechanical Engineering
  • Bioengineering
  • General Materials Science


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