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Direct observation of sp-d exchange interactions in colloidal Mn2+- and Co2+-doped CdSe quantum dots

Archer, Paul I. and Santangelo, Steven A. and Gamelin, Daniel R. (2007) Direct observation of sp-d exchange interactions in colloidal Mn2+- and Co2+-doped CdSe quantum dots. NANO LETTERS, 7 (4). pp. 1037-1043.

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Official URL: http://pubs.acs.org/doi/abs/10.1021/nl0702362

Abstract

The defining attribute of a diluted magnetic semiconductor (DMS) is the existence of dopant-carrier magnetic exchange interactions. In this letter, we report the first direct observation of such exchange interactions in colloidal doped CdSe nanocrystals. Doped CdSe quantum dots were synthesized by thermal decomposition of (Me4N)(2)[Cd-4(SePh)(10)] in the presence of TMCl2 (TM2+ = Mn2+ or Co2+) in hexadecylamine and were characterized by several analytical and spectroscopic techniques. Using magnetic circular dichroism spectroscopy, successful doping and the existence of giant excitonic Zeeman splittings in both Mn2+- and Co2+-doped wurtzite CdSe quantum dots are demonstrated unambiguously.

Item Type:Article
Uncontrolled Keywords:DILUTED MAGNETIC SEMICONDUCTOR; CADMIUM SELENIDE NANOCRYSTALS; ABSORPTION-SPECTROSCOPY; CIRCULAR-DICHROISM; SPINTRONICS; ZNSE; HETEROSTRUCTURE; CONFINEMENT; TRANSITION; INJECTION
Subjects:Material Science > Nanochemistry
ID Code:6174
Deposited By:IoN
Deposited On:11 Sep 2009 11:57
Last Modified:11 Sep 2009 11:57

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