Eliminating the fine structure splitting of excitons in self-assembled InAs/GaAs quantum dots via combined stresses

ORAL

Abstract

Eliminating the fine structure splitting (FSS) of excitons in self-assembled quantum dots (QDs) is essential to the generation of high quality entangled photon pairs. We show by a extended two-level model that the FSS of excitons in a general self-assembled InGaAs/GaAs QD can be fully suppressed via combined stresses along the [110] and [010] directions. The results of the model Hamiltonian are confirmed by atomic empirical pseudopotential calculations. For all the QDs we calculated, the FSS can be tuned to be vanishingly small ($<$ 0.1 $\mu$eV), which is sufficient small for high quality entangled photon emission.

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Authors

  • Lixin He

    • University of Science and Technology of China

  • Jianping Wang

    • University of Science and Technology of China

  • Ming Gong

    • Department of Physics, The University of Texas at Dallas, Richardson, TX, 75080 USA
    • Washington State University
    • Department of Physics, the University of Texas at Dallas
    • The University of Texas at Dallas
    • Department of Physics, The University of Texas at Dallas
    • Department of Physics, The University of Texas at Dallas, Richardson, TX, 75080

  • G.-C. Guo

    • University of Science and Technology of China