Peer-Reviewed Journal Details
Mandatory Fields
Juska, G;Murray, E;Dimastrodonato, V;Chung, TH;Moroni, ST;Gocalinska, A;Pelucchi, E
2015
April
Journal of Applied Physics
Conditions for entangled photon emission from (111)B site-controlled pyramidal quantum dots
Validated
WOS: 28 ()
Optional Fields
PAIRS WELLS EXCITONS
117
A study of highly symmetric site-controlled Pyramidal In0.25Ga0.75As quantum dots (QDs) is presented. It is discussed that polarization-entangled photons can be also obtained from Pyramidal QDs of different designs from the one already reported in Juska et al. (Nat. Phot. 7, 527, 2013). Moreover, some of the limitations for a higher density of entangled photon emitters are addressed. Among these issues are (1) a remaining small fine-structure splitting and (2) an effective QD charging under non-resonant excitation conditions, which strongly reduce the number of useful biexciton-exciton recombination events. A possible solution of the charging problem is investigated exploiting a dual-wavelength excitation technique, which allows a gradual QD charge tuning from strongly negative to positive and, eventually, efficient detection of entangled photons from QDs, which would be otherwise ineffective under a single-wavelength (non-resonant) excitation. (C) 2015 AIP Publishing LLC.
MELVILLE
0021-8979
10.1063/1.49167051
Grant Details