Voltage-controlled optics of a quantum dot

Alexander Högele, Stefan Seidl, Martin Kroner, Khaled Karrai, Richard J. Warburton, Brian D. Gerardot, Pierre M. Petroff

Research output: Contribution to journalArticlepeer-review

220 Citations (Scopus)


We show how the optical properties of a single semiconductor quantum dot can be controlled with a small dc voltage applied to a gate electrode. We find that the transmission spectrum of the neutral exciton exhibits two narrow lines with similar to2 mueV linewidth. The splitting into two linearly polarized components arises through an exchange interaction within the exciton. The exchange interaction can be turned off by choosing a gate voltage where the dot is occupied with an additional electron. Saturation spectroscopy demonstrates that the neutral exciton behaves as a two-level system. Our experiments show that the remaining problem for manipulating excitonic quantum states in this system is spectral fluctuation on a mueV energy scale.

Original languageEnglish
Article number217401
Pages (from-to)-
Number of pages4
JournalPhysical Review Letters
Issue number21
Publication statusPublished - 19 Nov 2004


Dive into the research topics of 'Voltage-controlled optics of a quantum dot'. Together they form a unique fingerprint.

Cite this