Title

Time-resolved Faraday rotation measurements of spin relaxation in InGaAs/GaAs quantum dots: Role of excess energy

Authors

Authors

J. L. Robb; Y. Chen; A. Timmons; K. C. Hall; O. B. Shchekin;D. G. Deppe

Comments

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Abbreviated Journal Title

Appl. Phys. Lett.

Keywords

RECOMBINATION; Physics, Applied

Abstract

The authors report measurements of room temperature spin dynamics in InGaAs quantum dots using time-resolved differential transmission and Faraday rotation techniques. They observe an enhancement of the electron spin lifetime by an order of magnitude for direct optical pumping of the quantum dot ground state compared to optical pumping of the GaAs barriers. These findings indicate that the optical excitation conditions can have a critical influence on the spin kinetics, a result which may account for the wide variation of spin lifetimes reported to date. The enhancement in spin lifetime observed here is attributed to the reduction of phonon-mediated spin-flip scattering. (c) 2007 American Institute of Physics.

Journal Title

Applied Physics Letters

Volume

90

Issue/Number

15

Publication Date

1-1-2007

Document Type

Article

Language

English

First Page

3

WOS Identifier

WOS:000245690700098

ISSN

0003-6951

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