https://doi.org/10.1007/s100510170305
Coherent dynamics of magnetoexcitons in semiconductor nanorings
1
Institut de Physique Appliquée, École Polytechnique
Fédérale, 1015 Lausanne, Switzerland
2
Department of Physics and Material Sciences Center,
Philipps University, Renthof 5, 35032 Marburg, Germany
Corresponding author: a klaus.maschke@epfl.ch
Received:
27
September
2000
Published online: 15 February 2001
The coherent dynamics of magnetoexcitons in semiconductor nanorings following pulsed optical excitation is studied. The calculated temporal evolution of the excitonic dipole moment may be understood as a superposition of the relative motion of electrons and holes and a global circular motion associated with the magnetic-field splitting of these states. This dynamics of the electron-hole pairs can be generated either by local optical excitation of an ordered ring or, alternatively, by homogeneous excitation of rings with broken rotational symmetry due to disorder or band tilting.
PACS: 71.35.Cc – Intrinsic properties of excitons; optical absorption spectra / 71.70.Ej – Spin-orbit coupling, Zeeman and Stark splitting, Jahn-Teller effect / 78.66.-w – Optical properties of specific thin films / 42.50.Md – Optical transient phenomena: quantum beats, photon echo, free-induction decay, dephasings and revivals, optical nutation, and self-induced transparency
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2001
