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Electron dynamics in transport and optical measurements of self‐assembled quantum dots
Author(s) -
Kurzmann Annika,
Merkel Benjamin,
Marquardt Bastian,
Beckel Andreas,
Ludwig Arne,
Wieck Andreas D.,
Lorke Axel,
Geller Martin
Publication year - 2017
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.201600625
Subject(s) - quantum dot , exciton , spectroscopy , quantum tunnelling , electron , optoelectronics , materials science , physics , molecular physics , condensed matter physics , quantum mechanics
The tunneling dynamics between self‐assembled quantum dots (QDs) and a charge reservoir can be measured in an all‐electrical or optical detection scheme. In all‐electrical transconductance spectroscopy, a two‐dimensional electron gas is used to probe the evolution of the many‐particle states inside an ensemble of QDs from non‐equilibrium to equilibrium. The optical detection scheme measures the tunneling dynamic into a single self‐assembled dot. The work done and results obtained using these different measurement techniques are reviewed and compared within this article. We will show that transconductance spectroscopy is sensitive to a time‐dependent density of states and enables preparation of non‐equilibrium charge and spin states for future applications in quantum information processing. The optical resonance fluorescence measurements on the electron dynamics demonstrates the influence of the exciton states on the charge‐carrier dynamics and enables a systematic study of the Auger recombination in self‐assembled dots.