Optical control of spin coherence in singly charged (In,Ga)As/GaAs quantum dots

A. Greilich, R. Oulton, E. A. Zhukov, I. A. Yugova, D. R. Yakovlev, M. Bayer, A. Shabaev, Al. L. Efros, I. A. Merkulov, V. Stavarache, D. Reuter, A. Wieck

Research output: Contribution to journalArticle (Academic Journal)peer-review

183 Citations (Scopus)

Abstract

Electron spin coherence has been generated optically in n-type modulation doped (In,Ga)As/GaAs quantum dots (QDs) which contain on average a single electron per dot. The coherence arises from resonant excitation of the QDs by circularly polarized laser pulses, creating a coherent superposition of an electron and a trion. Time dependent Faraday rotation is used to probe the spin precession of the optically oriented electrons about a transverse magnetic field. The coherence generation can be controlled by pulse intensity, being most efficient for (2n+1)pi pulses.

Original languageEnglish
Article number227401
Pages (from-to)-
Number of pages4
JournalPhysical Review Letters
Volume96
Issue number22
DOIs
Publication statusPublished - 9 Jun 2006

Cite this