Coherent state monitoring in quantum dots

Physical Review B - Condensed Matter and Materials Physics

Volumn 70, Issue 20, 2004, Pages

  Al Ahmadi, Ameenah N ^a   Ulloa, Sergio E ^a  

^a OHIO UNIVERSITY   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

DIMER;

ARTICLE; COLLOID; DIPOLE; DYNAMICS; EXCITATION; EXPERIMENT; MATHEMATICAL ANALYSIS; MATHEMATICAL MODEL; MOLECULAR INTERACTION; OSCILLATION; QUANTUM DOT;

EID: 42749106160     PISSN: 01631829     EISSN: None     Source Type: Journal    
DOI: 10.1103/PhysRevB.70.201302     Document Type: Article

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21. We should remark that it is well known that the dark, lower-energy exciton state is not optically active due to its angular momentum F = ± 2 (Ref. 1). However, this state may have a dipole moment due to defects, and other low-energy neighbors have nonzero dipole moment which can then produce a Förster coupling and its energy be (near) resonantly transferred to neighboring dots via virtual nonradiative intermediate states.
22. As the decay to the optically active states is quite fast (∼ few ps), differential absorption of the acceptor dot would reflect the population of the dark lower exciton state.