U. Perinetti

Publications (3)4.4 Total impact

• Article: Single Neutral Excitons Confined in AsBr3 In Situ Etched InGaAs Quantum Rings

  F. Ding, B. Li, N. Akopian, U. Perinetti, Y.H. Chen, F.M. Peeters, A. Rastelli, V. Zwiller, O.G. Schmidt
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  ABSTRACT: We observe the evolution of single self-assembled semiconductor quantum dots into quantum rings during AsBr3 in situ etching. The direct three-dimensional imaging of In(Ga)As nanostructures embedded in GaAs matrix is demonstrated by selective wet chemical etching combined with atomic force microscopy. Single neutral excitons confined in these quantum rings are studied by magneto-photoluminescence. Oscillations in the exciton radiative recombination energy and in the emission intensity are observed under an applied magnetic field. Further, we demonstrate that the period of the oscillations can be tuned by a gate potential that modifies the exciton confinement. The experimental results, combined with calculations, indicate that the exciton Aharonov-Bohm effect may account for the observed effects.
  Journal of Nanoelectronics and Optoelectronics 02/2011; 6(1):51-57. · 0.56 Impact Factor
• Source

  Available from: V. Zwiller

  Article: Tuning single GaAs quantum dots in resonance with a rubidium vapor

  N. Akopian, U. Perinetti, L. Wang, A. Rastelli, O. G. Schmidt, V. Zwiller
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  ABSTRACT: We study single GaAs quantum dots with optical transitions that can be brought into resonance with the widely used D2 transitions of rubidium atoms. We achieve resonance by Zeeman or Stark shifting the quantum dot levels. We discuss an energy stabilization scheme based on the absorption of quantum dot photoluminescence in a rubidium vapor. This offers a scalable means to counteract slow spectral diffusion in quantum dots.
  Applied Physics Letters 08/2010; 97(8):082103-082103-3. · 3.84 Impact Factor
• Source

  Available from: V. Zwiller

  Article: Gate controlled Aharonov-Bohm-type oscillations from single neutral excitons in quantum rings

  F. Ding, N. Akopian, B. Li, U. Perinetti, A. Govorov, F. M. Peeters, C. C. B. Bufon, C. Deneke, Y. H. Chen, A. Rastelli, O. G. Schmidt, V. Zwiller
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  ABSTRACT: We report on a magnetophotoluminescence study of single self-assembled semiconductor nanorings which are fabricated by molecular-beam epitaxy combined with AsBr3 in situ etching. Oscillations in the neutral exciton radiative recombination energy and in the emission intensity are observed under an applied magnetic field. Further, we control the period of the oscillations with a gate potential that modifies the exciton confinement. We infer from the experimental results, combined with calculations, that the exciton Aharonov-Bohm effect may account for the observed effects.
  Physical Review B. 82(7):075309.