Polarization spectroscopy of positive and negative trions in an InAs quantum dot |
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Authors: | Morgan E Ware Allan S Bracker Eric Stinaff Daniel Gammon David Gershoni Vladimir L Korenev |
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Institution: | aNaval Research Laboratory, 4555 Overlook Ave., SW, Washington DC 20375, USA;bPhysics Department, Technion-Israel Institute of Technology, Haifa 32000, Israel;cA.F. Ioffe Physical Technical Institute, St. Petersburg 194021, Russia |
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Abstract: | Using polarization-sensitive photoluminescence and photoluminescence excitation spectroscopy, we study single InAs/GaAs self-assembled quantum dots. The dots were embedded in an n-type, Schottky diode structure allowing for control of the charge state. We present here the exciton, singly charged exciton (positive and negative trions), and the twice negatively charged exciton. For non-resonant excitation below the wetting layer, we observed a large degree of polarization memory from the radiative recombination of both the positive and negative trions. In excitation spectra, through the p-shell, we have found several sharp resonances in the emission from the s-shell recombination of the dot in all charged states. Some of these excitation resonances exhibit strong coulomb shifts upon addition of charges into the quantum dot. One particular resonance of the negatively charged trion was found to exhibit a fine structure doublet under circular polarization. This observation is explained in terms of resonant absorption into the triplet states of the negative trion. |
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Keywords: | InAs self-assembled quantum dots Trion Polarization memory Photoluminescence excitation spectroscopy |
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