Laser spectroscopy of individual quantum dots charged with a single hole

Details Laser spectroscopy of individual quantum dots charged with a single hole Laser spectroscopy of individual quantum dots charged with a single hole

2011-09-20

arxiv.org/abs/1109.4392v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

12 pages including 5 figures

Scientific paper

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.

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