Coherent optical spectroscopy of charged exciton complexes in semiconductor nanostructures

Ilya A. Akimov, Sergey V. Poltavtsev, Matthias Salewski, Irina A. Yugova, Grzegorz Karczewski, Maciej Wiater, Tomasz Wojtowicz, Matthias Reichelt, Torsten Meier, Dmitri R. Yakovlev, Manfred Bayer

Research output

Abstract

We present results on photon echo spectroscopy for resonant excitation of localized charged exciton complexes (trions) in CdTe/CdMgTe semiconductor quantum wells. We demonstrate that the Zeeman splitting of resident electron spin levels in transverse magnetic field leads to quantum beats in the photon echoes with the Larmor precession frequency. This allows us to perform a coherent transfer of optical excitation into a spin ensemble and to observe long-lived photon echoes. Our approach can be used as a tool for remarkably high resolution spectroscopy of the ground state levels: We are able to resolve splittings between the spin levels with sub-μeV precision and to distinguish between different types of electrons in the ensemble, namely electrons either bound to donors or localized on quantum well potential fluctuations. To that end we show that stimulated step-like Raman processes in the two-pulse excitation scheme allow us to probe the electron spin ensemble with high selectivity and precision even for systems with broad optical transitions. Next, Rabi oscillations for exciton complexes with different degree of localization are detected by photon echo spectroscopy. We observe that an increase of the area of either the first or the second pulse leads to a significant decrease of the photon echo signal, which is strongest for the neutral excitons and less pronounced for the donor-bound exciton complex.

Original languageEnglish
Title of host publicationUltrafast Phenomena and Nanophotonics XXII
EditorsAbdulhakem Y. Elezzabi, Markus Betz
PublisherSPIE
Number of pages7
Volume10530
ISBN (Electronic)9781510615458
ISBN (Print)9781510615458
DOIs
Publication statusPublished - 1 Jan 2018
EventUltrafast Phenomena and Nanophotonics XXII 2018 - San Francisco
Duration: 29 Jan 201831 Jan 2018

Publication series

NameProceedings of SPIE
PublisherSPIE-INT SOC OPTICAL ENGINEERING
Volume10530
ISSN (Print)0277-786X

Conference

ConferenceUltrafast Phenomena and Nanophotonics XXII 2018
CountryUnited States
CitySan Francisco
Period29/01/1831/01/18

Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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