CUED Publications database

Observation of charge transport by negatively charged excitons.

Sanvitto, D and Pulizzi, F and Shields, AJ and Christianen, PC and Holmes, SN and Simmons, MY and Ritchie, DA and Maan, JC and Pepper, M (2001) Observation of charge transport by negatively charged excitons. Science, 294. pp. 837-839. ISSN 0036-8075

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We report transport of electron-hole complexes in semiconductor quantum wells under applied electric fields. Negatively charged excitons (X-), created by laser excitation of a high electron mobility transistor, are observed to drift upon applying a voltage between the source and drain. In contrast, neutral excitons do not drift under similar conditions. The X- mobility is found to be as high as 6.5 x 10(4) cm2 V-1 s-1. The results demonstrate that X- exists as a free particle in the best-quality samples and suggest that light emission from opto-electronic devices can be manipulated through exciton drift under applied electric fields.

Item Type: Article
Divisions: Div B > Photonics
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 19:31
Last Modified: 03 Oct 2019 02:51
DOI: 10.1126/science.1064847