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

Högele, A. et al. (2005) Spin-selective optical absorption of singly charged excitons in a quantum dot. Applied Physics Letters, 86(22), 221905. (doi: 10.1063/1.1940733)

Abstract

We report 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 the spin blockade off. This effect is observed at 1.5 K and up to 9 T.

• Item Type: Articles
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Badolato, Professor Antonio
• Authors: Högele, A., Kroner, M., Seidl, S., Karrai, K., Atatüre, M., Dreiser, J., Imamoğlu, A., Warburton, R. J., Badolato, A., Gerardot, B. D., and Petroff, P. M.
• College/School: College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
• Journal Name: Applied Physics Letters
• Publisher: American Institute of Physics
• ISSN: 0003-6951
• ISSN (Online): 1077-3118
• Published Online: 24 May 2005