Optical characterization of individual quantum dots

Holtz, Per-OlofLinköpings universitet,Halvledarmaterial,Tekniska högskolan (author)

Funding Agencies|Swedish Research Council (VR)||Swedish Foundation for Strategic Research (SSF)||Nano-N consortium||Science Foundation Ireland|05/IN.1/I25|Knut and Alice Wallenberg Foundation||INSPIRE||
Optical characterization of single quantum dots (QDs) by means of micro-photoluminescence (mu PL) will be reviewed. Both QDs formed in the Stranski-Krastanov mode as well as dots in the apex of pyramidal structures will be presented. For InGaAs/GaAs dots, several excitonic features with different charge states will be demonstrated. By varying the magnitude of an external electric or magnetic field and/or the temperature, it has been demonstrated that the transportation of carriers is affected and accordingly the charge state of a single QD can be tuned. In addition, we have shown that the charge state of the QD can be controlled also by pure optical means, i.e. by altering the photo excitation conditions. Based on the experience of the developed InAs/GaAs QD system, similar methods have been applied on the InGaN/GaN QD system. less thanbrgreater than less thanbrgreater thanThe coupling of LO phonons to the QD emission is experimentally examined for both charged and neutral excitons in single InGaAs/GaAs QDs in the apex of pyramidal structures. It is shown that the positively charged exciton exhibits a significantly weaker LO phonon coupling in the mu PL spectra than the neutral and negatively charged species, a fact, which is in consistency with model simulations performed.

Hsu, Chih-WeiLinköpings universitet,Halvledarmaterial,Tekniska högskolan(Swepub:liu)chihs22 (author)
Larsson, L ALinköpings universitet,Halvledarmaterial,Tekniska högskolan (author)
Karlsson, K FredrikLinköpings universitet,Halvledarmaterial,Tekniska högskolan(Swepub:liu)freka74 (author)
Dufåker, DanielLinköpings universitet,Halvledarmaterial,Tekniska högskolan(Swepub:liu)dandu48 (author)
Lundskog, AndersLinköpings universitet,Halvledarmaterial,Tekniska högskolan(Swepub:liu)andlu37 (author)
Forsberg, UrbanLinköpings universitet,Halvledarmaterial,Tekniska högskolan(Swepub:liu)urbfo25 (author)
Janzén, ErikLinköpings universitet,Halvledarmaterial,Tekniska högskolan(Swepub:liu)erija14 (author)
Moskalenko, EvgeniiLinköpings universitet,Institutionen för fysik, kemi och biologi,Tekniska högskolan(Swepub:liu)evgmo15 (author)
Dimastrodonato, VNational University of Ireland University of Coll Cork (author)
Mereni, LNational University of Ireland University of Coll Cork (author)
Pelucchi, ENational University of Ireland University of Coll Cork (author)
Linköpings universitetHalvledarmaterial (creator_code:org_t)

By the author/editor: Holtz, Per-Olof; Hsu, Chih-Wei; Larsson, L A; Karlsson, K Fred ...; Dufåker, Daniel; Lundskog, Anders; show more...; Forsberg, Urban; Janzén, Erik; Moskalenko, Evge ...; Dimastrodonato, ...; Mereni, L; Pelucchi, E; show less...

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