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Observation of PL intensity modulation in self-assembled Quantum Rings (QR) under strong pulsed magnetic fields

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  • Jorge M. Garcia
  • Daniel Granados
  • Manus Hayne
  • W Jantsch
  • Victor V. Moshchalkov
  • F Schaffler
  • Alfonso G. Taboada
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Abstract

We present photoluminescence (PL) measurements of self-assembled In(Ga)As QRs in strong pulsed magnetic fields. The results show a striking modulation of the intensity. This modulation of the emission can be attributed to an effect predicted by Govorov et al.: a mechanism for the topological phase of a neutral particle, a polarized exciton confined to a semiconductor quantum ring. The magnetic-field induced phase strongly affects the excitons in the QR, resulting in switching between bright exciton ground states and novel dark states.