Observation of excitation transfer among neighboring quantum dots
Identifieur interne : 00FE86 ( Main/Repository ); précédent : 00FE85; suivant : 00FE87Observation of excitation transfer among neighboring quantum dots
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Abstract
Coupling between spatially separated zero-dimensional states has been observed in a system of self-assembled In0.55Al0.45As quantum dots. Photoluminescence excitation spectra, taken at 4.2 K with a near-field scanning optical microscope, reveals narrow resonances in the emission lines of individual dots when the excitation energy is tuned below the barrier band edge. A fraction of these resonances occur simultaneously in emission corresponding to different dots, evincing lateral interdot excitation transfer. Experiments show that the wetting layer in the sample consists solely of localized states which are then invoked to explain the excitation transfer over the relatively large interdot spacing.
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Robinson</name><affiliation wicri:level="2"><inist:fA14 i1="01"><s1>Department of Physics, Boston University, Boston, Massachusetts 02215</s1><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ></inist:fA14><country xml:lang="fr">États-Unis</country><placeName><region type="state">Massachusetts</region></placeName><wicri:cityArea>Department of Physics, Boston University, Boston</wicri:cityArea></affiliation><affiliation wicri:level="2"><inist:fA14 i1="02"><s1>Department of Electrical Engineering, Notre Dame University, South Bend, Indiana 46556</s1></inist:fA14><country xml:lang="fr">États-Unis</country><placeName><region type="state">Indiana</region></placeName><wicri:cityArea>Department of Electrical Engineering, Notre Dame University, South Bend</wicri:cityArea></affiliation></author><author><name sortKey="Goldberg, B B" uniqKey="Goldberg B">B. B. Goldberg</name><affiliation wicri:level="2"><inist:fA14 i1="01"><s1>Department of Physics, Boston University, Boston, Massachusetts 02215</s1><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ></inist:fA14><country xml:lang="fr">États-Unis</country><placeName><region type="state">Massachusetts</region></placeName><wicri:cityArea>Department of Physics, Boston University, Boston</wicri:cityArea></affiliation></author><author><name sortKey="Merz, J L" uniqKey="Merz J">J. L. Merz</name><affiliation wicri:level="2"><inist:fA14 i1="01"><s1>Department of Physics, Boston University, Boston, Massachusetts 02215</s1><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ></inist:fA14><country xml:lang="fr">États-Unis</country><placeName><region type="state">Massachusetts</region></placeName><wicri:cityArea>Department of Physics, Boston University, Boston</wicri:cityArea></affiliation></author></titleStmt><publicationStmt><idno type="inist">01-0329581</idno><date when="2001-08-15">2001-08-15</date><idno type="stanalyst">PASCAL 01-0329581 AIP</idno><idno type="RBID">Pascal:01-0329581</idno><idno type="wicri:Area/Main/Corpus">010C86</idno><idno type="wicri:Area/Main/Repository">00FE86</idno></publicationStmt><seriesStmt><idno type="ISSN">1098-0121</idno><title level="j" type="abbreviated">Phys. rev., B, Condens. matter mater. phys.</title><title level="j" type="main">Physical review. B, Condensed matter and materials physics</title></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Aluminium compounds</term><term>Experimental study</term><term>III-V semiconductors</term><term>Indium compounds</term><term>Interface states</term><term>Photoluminescence</term><term>Semiconductor quantum dots</term><term>Wetting</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>7321</term><term>7866F</term><term>7855C</term><term>Etude expérimentale</term><term>Indium composé</term><term>Aluminium composé</term><term>Semiconducteur III-V</term><term>Point quantique semiconducteur</term><term>Photoluminescence</term><term>Mouillage</term><term>Etat interface</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Coupling between spatially separated zero-dimensional states has been observed in a system of self-assembled In<sub>0.55</sub>Al<sub>0.45</sub>As quantum dots. Photoluminescence excitation spectra, taken at 4.2 K with a near-field scanning optical microscope, reveals narrow resonances in the emission lines of individual dots when the excitation energy is tuned below the barrier band edge. A fraction of these resonances occur simultaneously in emission corresponding to different dots, evincing lateral interdot excitation transfer. Experiments show that the wetting layer in the sample consists solely of localized states which are then invoked to explain the excitation transfer over the relatively large interdot spacing.</div></front></TEI><inist><standard h6="B"><pA><fA01 i1="01" i2="1"><s0>1098-0121</s0></fA01><fA02 i1="01"><s0>PRBMDO</s0></fA02><fA03 i2="1"><s0>Phys. rev., B, Condens. matter mater. phys.</s0></fA03><fA05><s2>64</s2></fA05><fA06><s2>7</s2></fA06><fA08 i1="01" i2="1" l="ENG"><s1>Observation of excitation transfer among neighboring quantum dots</s1></fA08><fA11 i1="01" i2="1"><s1>ROBINSON (H. 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