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Exciton fine structure splitting in InP quantum dots in GaInP : Optical coherence and collective phenomena in nanostructures

Identifieur interne : 007A08 ( Main/Repository ); précédent : 007A07; suivant : 007A09

Exciton fine structure splitting in InP quantum dots in GaInP : Optical coherence and collective phenomena in nanostructures

Auteurs : RBID : Pascal:07-0393791

Descripteurs français

Pascal (Inist)
- Décomposition niveau énergie, Structure fine, Structure électronique, Exciton, Etat fondamental, Approximation dipolaire, Photoluminescence, Décomposition raie, Point quantique, Gallium phosphure, Indium phosphure, InP, GaInP, 7321L, 7867H.

English descriptors

KwdEn :
- Dipole approximation, Electronic structure, Energy-level splitting, Excitons, Fine structure, Gallium phosphides, Ground states, Indium phosphides, Line splitting, Photoluminescence, Quantum dots.

Abstract

We have investigated the electronic structure of excitons in InP quantum dots in GaInP. The exciton is theoretically expected to have four states. Two of the states are allowed to optically decay to the ground (vacuum) state in the dipole approximation. We see these two lines in photoluminescence (PL) experiments and find that the splitting between the lines (the fine structure splitting) is 150(±30) μeV. The lines were perpendicularly polarized. We verified that the lines arise from neutral excitons by using correlation spectroscopy. The theoretical calculations show that the polarization of the emission lines are along and perpendicular to the major axis of elongated dots. The fine structure splitting depends on the degree of elongation of the dots and is close to zero for dots of cylindrical symmetry, despite the influence of the piezoelectric polarization, which is included in the calculation.

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Le document en format XML

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<author><name sortKey="Ellstrom, C" uniqKey="Ellstrom C">C. Ellström</name>
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<author><name sortKey="Seifert, W" uniqKey="Seifert W">W. Seifert</name>
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<author><name sortKey="Samuelson, L" uniqKey="Samuelson L">L. Samuelson</name>
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<author><name sortKey="Pistol, M E" uniqKey="Pistol M">M.-E. Pistol</name>
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<term>Electronic structure</term>
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<term>Excitons</term>
<term>Fine structure</term>
<term>Gallium phosphides</term>
<term>Ground states</term>
<term>Indium phosphides</term>
<term>Line splitting</term>
<term>Photoluminescence</term>
<term>Quantum dots</term>
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<keywords scheme="Pascal" xml:lang="fr"><term>Décomposition niveau énergie</term>
<term>Structure fine</term>
<term>Structure électronique</term>
<term>Exciton</term>
<term>Etat fondamental</term>
<term>Approximation dipolaire</term>
<term>Photoluminescence</term>
<term>Décomposition raie</term>
<term>Point quantique</term>
<term>Gallium phosphure</term>
<term>Indium phosphure</term>
<term>InP</term>
<term>GaInP</term>
<term>7321L</term>
<term>7867H</term>
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<front><div type="abstract" xml:lang="en">We have investigated the electronic structure of excitons in InP quantum dots in GaInP. The exciton is theoretically expected to have four states. Two of the states are allowed to optically decay to the ground (vacuum) state in the dipole approximation. We see these two lines in photoluminescence (PL) experiments and find that the splitting between the lines (the fine structure splitting) is 150(±30) μeV. The lines were perpendicularly polarized. We verified that the lines arise from neutral excitons by using correlation spectroscopy. The theoretical calculations show that the polarization of the emission lines are along and perpendicular to the major axis of elongated dots. The fine structure splitting depends on the degree of elongation of the dots and is close to zero for dots of cylindrical symmetry, despite the influence of the piezoelectric polarization, which is included in the calculation.</div>
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<fC01 i1="01" l="ENG"><s0>We have investigated the electronic structure of excitons in InP quantum dots in GaInP. The exciton is theoretically expected to have four states. Two of the states are allowed to optically decay to the ground (vacuum) state in the dipole approximation. We see these two lines in photoluminescence (PL) experiments and find that the splitting between the lines (the fine structure splitting) is 150(±30) μeV. The lines were perpendicularly polarized. We verified that the lines arise from neutral excitons by using correlation spectroscopy. The theoretical calculations show that the polarization of the emission lines are along and perpendicular to the major axis of elongated dots. The fine structure splitting depends on the degree of elongation of the dots and is close to zero for dots of cylindrical symmetry, despite the influence of the piezoelectric polarization, which is included in the calculation.</s0>
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Exciton fine structure splitting in InP quantum dots in GaInP : Optical coherence and collective phenomena in nanostructures

Exciton fine structure splitting in InP quantum dots in GaInP : Optical coherence and collective phenomena in nanostructures

Descripteurs français

English descriptors

Abstract

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