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

doi:10.1021/nl061414e

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

University of Toronto

Research output: Contribution to journal › Article › peer-review

42 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 language	English
Pages (from-to)	1765-1771
Number of pages	7
Journal	Nano Letters
Volume	6
Issue number	8
DOIs	https://doi.org/10.1021/nl061414e
State	Published - Aug 2006
Externally published	Yes

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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.",

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AU - Kim, Jeongho

AU - Wong, Cathy Y.

AU - Huxter, Vanessa M.

AU - Nair, P. Sreekumari

AU - Fritz, Karolina P.

AU - Kumar, Sandeep

PY - 2006/8

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AB - 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.

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Nanocrystal shape and the mechanism of exciton spin relaxation

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