Two Color micro-photoluminescence excitation studies of exciton states in Coupled Quantum Dots

ORAL

Abstract

In this report we examined the charge states of various excitons found in the optical spectra of coupled In$_{\mathrm{1-x}}$Ga$_{\mathrm{x}}$As quantum dots (QDs) grown by molecular beam epitaxy, under two color optical excitation. This experiment is performed by using micro-photoluminescence excitation technique, where we keep the excitation energy of one laser fixed at the energy of wetting layer (non-resonant excitation) and tuning the excitation energy of the other laser through the states of quantum dot (resonant excitation). This study may help identifying enhanced states of various charge excitons, which are possibly useful for generating on demand entangle photon pairs with QDs.

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Authors

  • Ramana Thota

    Department of Physics and Astronomy, and Nanoscale and Quantum Phenomena Institute, Ohio University, Athens, Ohio 45701-2979, USA

  • Eric Stinaff

    Ohio University, Department of Physics and Astronomy, and Nanoscale and Quantum Phenomena Institute, Ohio University, Athens, Ohio 45701-2979, USA

  • Kurt Baughman

    Center for Nanoscale Materials, Argonne National Lab, Argonne, Illinois, Department of Physics and Astronomy, Ohio University, Athens, Ohio, Ohio University, Los Alamos Nationa Laboratory, National Taiwan University, University of Hamburg, Trinity College, Dublin, Serbian Academy of Sciences and Arts, Institute for Multidisciplinary Research, University of Belgrade, National High Magnetic Field Laboratory, Brookhaven National Laboratory, The University of Akron, NQPI, Physics and Astronomy Dept., Ohio University, GNS \& MANA Satellite, CEMES, CNRS, IMRE, A*STAR, Nanoscale and Quantum Phenomena Institute (NQPI), Physics and Astronomy Dept., Ohio University, Nanoscale and Quantum Phenomena Institute, and Department of Physics \& Astronomy, Ohio University, Athens, OH 45701, CEMES, CNRS, Toulouse, France, Nanoscale and Quantum Phenomena Institute, and Department of Physics \& Astronomy, Ohio University, Athens, OH, NQPI, and Department of Physics \& Astronomy, Ohio University, Athens, OH, NQPI Dept of Physics and astronomy Ohio University, Naval Research Labs, Washington DC 20375, John Carroll University, Lawrence Livermore National Laboratory, The Ohio State University Department of Physics, Nanoscale and Quantum Phenomena Institute, Department of Physics and Astronomy, Ohio University, Athens, Ohio, Chemical and Materials Sciences Division, Pacific Northwest National Laboratory, Richland, Washington, National High Magnetic Field Laboratory, Tallahassee, University of Wisconsin Oshkosh, Wittenberg University, NQPI, Ohio University; CNM Argonne National Laboratory, APS, CNM, Argonne National Laboratory, Ohio University, Athens 45701, USA, None, Dept. of Physics, Hiram College, Physics Department, Cleveland State University, Flash Center for Computational Science, University of Chicago, Center for Energy Research, University of California San Diego; Lawrence Livermore National Laboratory, Ohio Northern University, Ohio University Zanesville

  • Kurt Baughman

    Center for Nanoscale Materials, Argonne National Lab, Argonne, Illinois, Department of Physics and Astronomy, Ohio University, Athens, Ohio, Ohio University, Los Alamos Nationa Laboratory, National Taiwan University, University of Hamburg, Trinity College, Dublin, Serbian Academy of Sciences and Arts, Institute for Multidisciplinary Research, University of Belgrade, National High Magnetic Field Laboratory, Brookhaven National Laboratory, The University of Akron, NQPI, Physics and Astronomy Dept., Ohio University, GNS \& MANA Satellite, CEMES, CNRS, IMRE, A*STAR, Nanoscale and Quantum Phenomena Institute (NQPI), Physics and Astronomy Dept., Ohio University, Nanoscale and Quantum Phenomena Institute, and Department of Physics \& Astronomy, Ohio University, Athens, OH 45701, CEMES, CNRS, Toulouse, France, Nanoscale and Quantum Phenomena Institute, and Department of Physics \& Astronomy, Ohio University, Athens, OH, NQPI, and Department of Physics \& Astronomy, Ohio University, Athens, OH, NQPI Dept of Physics and astronomy Ohio University, Naval Research Labs, Washington DC 20375, John Carroll University, Lawrence Livermore National Laboratory, The Ohio State University Department of Physics, Nanoscale and Quantum Phenomena Institute, Department of Physics and Astronomy, Ohio University, Athens, Ohio, Chemical and Materials Sciences Division, Pacific Northwest National Laboratory, Richland, Washington, National High Magnetic Field Laboratory, Tallahassee, University of Wisconsin Oshkosh, Wittenberg University, NQPI, Ohio University; CNM Argonne National Laboratory, APS, CNM, Argonne National Laboratory, Ohio University, Athens 45701, USA, None, Dept. of Physics, Hiram College, Physics Department, Cleveland State University, Flash Center for Computational Science, University of Chicago, Center for Energy Research, University of California San Diego; Lawrence Livermore National Laboratory, Ohio Northern University, Ohio University Zanesville