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Transient absorption spectroscopy of a single lateral InGaAs quantum dot molecule
Author(s) -
Wolpert Christian,
Wang Lijuan,
Rastelli Armando,
Schmidt Oliver G.,
Giessen Harald,
Lippitz Markus
Publication year - 2012
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.201100783
Subject(s) - quantum dot , spectroscopy , exciton , dipole , spontaneous emission , atomic physics , absorption spectroscopy , electric field , absorption (acoustics) , physics , ultrafast laser spectroscopy , biexciton , molecular physics , materials science , condensed matter physics , optoelectronics , optics , quantum mechanics , laser
Lateral quantum dot molecules promise a scalable approach to quantum registers. The individual neutral exciton states can be controlled by a lateral bias voltage. In this way radiative emission of localized excitons can be switched between the two quantum dots in the molecule. Here, we report on coherent absorption spectroscopy of a single quantum dot molecule. By transient reflection spectroscopy we demonstrate that not only the emission but also the absorption switches from one dot to the other when varying the applied electric field. This result is consistent with Rabi flopping showing a radically suppressed dipole moment for the non‐emitting exciton transition