Cooling of radiative quantum dot excitons by THz-radiation

Fredrik Boxberg, Jukka Tulkki, Go Yusa, Hiroyuki Sakaki

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Yusa et al. reported an anomalous cooling of radiative quantum dot (QD) excitons by THz-radiation in [Proc. 24th ICPS, 1083 (1998)] We have analyzed this experiment using continuum elasticity, multi-band k · p and spin-resolved Monte-Carlo methods. We show that the unexpected discovery is related to hole relaxation via piezo-electric potential minima, induced in the QD sample by InP stressor islands. The THz-radiation gives rise to a drift of dark excitons from the piezoelectric minima to radiative states in the deformation potential minimum. This increases the QD ground state luminescence at the expense of the luminescence from higher QD states. We reproduce also the delayed flash of QD ground state luminescence when a THz-radiation pulse hits the sample even ∼ls after switchins off the carrier seneration.

Original languageEnglish
Title of host publicationPhysics of Semiconductors - 28th International Conference on the Physics of Semiconductors, ICPS 2006, Part A and B
Pages999-1000
Number of pages2
DOIs
Publication statusPublished - 2007 Dec 1
Externally publishedYes
Event28th International Conference on the Physics of Semiconductors, ICPS 2006 - Vienna, Austria
Duration: 2006 Jul 242006 Jul 28

Publication series

NameAIP Conference Proceedings
Volume893
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Other

Other28th International Conference on the Physics of Semiconductors, ICPS 2006
Country/TerritoryAustria
CityVienna
Period06/7/2406/7/28

Keywords

  • Cooling
  • Intra-band
  • Photoluminescence
  • Quantum dot
  • Relaxation

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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