Laser spectroscopy of individual quantum dots charged with a single hole

B. D. Gerardot, R. J. Barbour, D. Brunner, P. A. Dalgarno, A. Badolato, N. Stoltz, P. M. Petroff, J. Houel, R. J. Warburton

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Abstract

We characterize the positively charged exciton (X1+) in single InGaAs quantum dots using resonant laser spectroscopy. Three samples with different dopant species (Be or C as acceptors, Si as a donor) are compared. The p-doped samples exhibit larger inhomogeneous broadening (x3) and smaller absorption contrast (x10) than the n-doped sample. For X1+ in the Be-doped sample, a dot dependent non-linear Fano effect is observed, demonstrating coupling to degenerate continuum states. However, for the C-doped sample, the X1+ lineshape and saturation broadening follows isolated atomic transition behaviour. This C-doped device structure is useful for single hole spin initialization, manipulation, and measurement. (C) 2011 American Institute of Physics. 

Original languageEnglish
Article number243112
Pages (from-to)-
Number of pages3
JournalApplied Physics Letters
Volume99
Issue number24
DOIs
Publication statusPublished - 12 Dec 2011

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