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

36 Scopus citations

Abstract

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
Volume6
Issue number8
DOIs
StatePublished - Aug 1 2006
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

Fingerprint Dive into the research topics of 'Nanocrystal shape and the mechanism of exciton spin relaxation'. Together they form a unique fingerprint.

Cite this