title: Controlling the exciton fine structure splitting in CdSe/CdS dot-in-rod nanojunctions.
abstract: We demonstrate control and tunability of the exciton fine-structure splitting by properly engineering a nanojunction consisting of a CdSe nanocrystal core and an asymmetric rod-like CdS shell. Samples with small core and/or thick rod diameters exhibit a strongly reduced fine-structure splitting resulting from a reduced electron-hole exchange interaction. These results shed light onto the electronic configuration of such nanosystems and, apart from being of fundamental interest, could enable the use of colloidal nanocrystals as a source of entangled photons.
authors.affiliation: IBM Research-Zurich, Säumerstrasse 4, 8803 Rüschlikon, Switzerland. gra@zurich.ibm.com
authors.forename: Gabriele
authors.initials: G
authors.lastname: Rainò
authors.forename: Thilo
authors.initials: T
authors.lastname: Stöferle
authors.forename: Iwan
authors.initials: I
authors.lastname: Moreels
authors.forename: Raquel
authors.initials: R
authors.lastname: Gomes
authors.forename: Zeger
authors.initials: Z
authors.lastname: Hens
authors.forename: Rainer F
authors.initials: RF
authors.lastname: Mahrt
mesh_terms: D019187:Cadmium Compounds / Q000737:chemistry*; D003102:Colloids; D004583:Electrons; D049329:Nanostructures / Q000737:chemistry*; D036103:Nanotechnology / Q000379:methods*; D055620:Optical Phenomena; D018036:Selenium Compounds / Q000737:chemistry*; D013440:Sulfides / Q000737:chemistry*; D013696:Temperature
chemical_list: D019187:Cadmium Compounds; D003102:Colloids; D018036:Selenium Compounds; D013440:Sulfides; C034939:cadmium sulfide; C058667:cadmium selenide