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Title: All-optical depletion of dark excitons from a semiconductor quantum dot

Semiconductor quantum dots are considered to be the leading venue for fabricating on-demand sources of single photons. However, the generation of long-lived dark excitons imposes significant limits on the efficiency of these sources. We demonstrate a technique that optically pumps the dark exciton population and converts it to a bright exciton population, using intermediate excited biexciton states. We show experimentally that our method considerably reduces the dark exciton population while doubling the triggered bright exciton emission, approaching thereby near-unit fidelity of quantum dot depletion.
Authors:
; ; ;  [1] ;  [1] ;  [2] ; ;  [3]
  1. The Physics Department and the Solid State Institute, Technion-Israel Institute of Technology, Haifa 32000 (Israel)
  2. (Israel)
  3. Institute of Solid State Physics, Technische Universit├Ąt Berlin, 10623 Berlin (Germany)
Publication Date:
OSTI Identifier:
22399052
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 106; Journal Issue: 19; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; EFFICIENCY; EXCITED STATES; EXCITONS; OPTICAL PUMPING; PHOTON EMISSION; QUANTUM DOTS; SEMICONDUCTOR MATERIALS