Regensburg 2016 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 4: Spintronics: Nanostructures and Optics

HL 4.6: Vortrag

Montag, 7. März 2016, 10:45–11:00, H13

g-factor properties of electrons and holes confined in quantum dots emitting at telecom wavelengths — •Janina Schindler¹, Vasilii V. Belykh¹, Dmitri R. Yakovlev^1,2, Evgeny A. Zhukov¹, Matusala Yacob³, Johann P. Reithmaier³, Mohamed Benyoucef³, and Manfred Bayer^1,2 — ¹Experimentelle Physik 2, TU Dortmund, 44227 Dortmund, Germany — ²Ioffe Institute, Russian Academy of Sciences, 194021 St. Petersburg, Russia — ³Institute of Nanostructure Technologies and Analytics, University of Kassel, 34132 Kassel, Germany

Spins in semiconductor quantum dots (QDs) are considered as highly attractive systems for future applications in the solid-state quantum information processing. In that context, the characterization of g-factors is very important to assess the spin dynamics for the semiconductor physics in general and for tailoring nanostructures in particular, since the dynamics are sensitive to shape anisotropies as well as spin-state mixing. We study electron and hole g-factors and dephasing times in a novel InAs/InAlGaAs/InP quantum dot ensemble by measuring time-resolved pump-probe ellipticity. The emission of the QDs lies in the telecommunication wavelength range around 1.55 µm, which is highly interesting for information-processing applications. We observe a surprisingly strong deviation of the electron g-factor from the Roth-Lax-Zwerdling equation, a strong dispersion of the hole g-factor and a significant out-of-plane anisotropy of the g-factors, in contrast to nearly isotropic in-plane properties.