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