Spin-selective optical absorption of singly charged excitons in a quantum dot

Details Spin-selective optical absorption of singly charged excitons in a quantum dot Spin-selective optical absorption of singly charged excitons in a quantum dot

2004-10-20

arxiv.org/abs/cond-mat/0410506v2

Appl. Phys. Lett. 86, 221905 (2005)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

3 pages, 4 figures; content as published

Scientific paper

10.1063/1.1940733

We investigate high resolution laser absorption spectroscopy of a single InGaAs/GaAs self-assembled quantum dot embedded in a field-effect structure. We show experimentally that the interband optical absorption to the lower Zeeman branch of the singly charged exciton is strongly inhibited due to spin (Pauli) blockade of the optical transition. At high magnetic fields the optical absorption to the upper Zeeman branch dominates the absorption spectrum. We find however that the spin blockade is not complete and a 10% leakage remains at high magnetic fields. Applying a gate voltage to empty the dot of its resident electron turns off the spin blockade. This effect is observed at 1.5 K and up to 9 Tesla.

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