Nano Archive

A semiconductor exciton memory cell based on a single quantum nanostructure

Krenner, Hubert J. and Pryor, Craig E. and He, Jun and Petroff, Pierre M. (2008) A semiconductor exciton memory cell based on a single quantum nanostructure. NANO LETTERS, 8 (6). pp. 1750-1755.

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We demonstrate storage of excitons in a single nanostructure, a self-assembled quantum post. After generation, electrons and holes forming the excitons are separated by an electric field toward opposite ends of the quantum post inhibiting their radiative recombination. After a defined time, the spatially indirect excitons are reconverted to optically active direct excitons by switching the electric field. The emitted light of the stored exciton is detected in the limit of a single nanostructure and storage times exceeding 30 msec are demonstrated. We identify a slow tunneling of the electron out of the quantum post as the dominant loss mechanism by comparing the field dependent temporal decay of the storage signal to models for this process and radiative losses.

Item Type:Article
Subjects:Material Science > Tunnelling and microscopic phenomena
Physical Science > Nano objects
ID Code:6400
Deposited By:IoN
Deposited On:06 Aug 2009 14:38
Last Modified:06 Aug 2009 14:38

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