Optical generation of spin coherence in single-charged (In,Ga)As/GaAs self-assembled quantum dots

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

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

Abstract

The generation of electron spin coherence has been studied in n-modulation-doped (In,Ga)As/GaAs self-assembled quantum dots (QDs) which contain on average a single electron per dot. The doping has been confirmed by pump-probe Faraday rotation experiments in a magnetic field parallel to the heterostructure growth direction. For studying spin coherence, the magnetic field was rotated by 90 degrees to the Voigt geometry, and the precession of the electron spin about the field was monitored. The coherence is generated by resonant excitation of the QDs with circularly polarized laser pulses, creating a coherent superposition of an electron, and a trion state. The efficiency of the generation can be controlled by the pulse intensity, being most efficient for (2n+ 1)pi pulses. (c) 2006 Elsevier B.V. All rights reserved.

Original languageEnglish
Pages (from-to)272-277
Number of pages6
JournalPhysica E: Low-dimensional Systems and Nanostructures
Volume35
Issue number2
DOIs
Publication statusPublished - Dec 2006

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