Few-electron ground states of charge-tunable self-assembled quantum dots
Identifieur interne : 001A88 ( France/Analysis ); précédent : 001A87; suivant : 001A89Few-electron ground states of charge-tunable self-assembled quantum dots
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Abstract
The few-electron ground states of self-assembled InAs quantum dots are investigated using high-resolution capacitance spectroscopy in magnetic fields up to 23 T. The level structure reveals distinct shells which are labeled as s-, p-, and d-like according to their symmetry. Our measurements enable us to resolve the single-electron charging not only of the lowest (s) state with two electrons but also of the second lowest (p) state with four electrons as pronounced maxima in the capacitance spectra. Furthermore, two peaks at higher energy can be attributed to charging of the d shell with the first two electrons. We discuss the energy spectrum in terms of spatial quantization energy, Coulomb blockade, and many-particle effects. At around B=15 T we observe a magnetic-field-induced intermixing of the p and d shell. Additional fine structure in the capacitance spectra is observed and discussed both in terms of nearest-neighbor Coulomb interactions and monolayer fluctuations of the dot size.
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<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en" level="a">Few-electron ground states of charge-tunable self-assembled quantum dots</title><author><name sortKey="Miller, B T" uniqKey="Miller B">B. T. Miller</name><affiliation wicri:level="3"><inist:fA14 i1="01"><s1>Sektion Physik, LMU Munchen, Geschwister-Scholl-Platz 1, 80539 Munchen, Germany</s1><sZ>1 aut.</sZ></inist:fA14><country xml:lang="fr">Allemagne</country><wicri:regionArea>Sektion Physik, LMU Munchen, Geschwister-Scholl-Platz 1, 80539 Munchen</wicri:regionArea><placeName><region type="land" nuts="1">Bavière</region><region type="district" nuts="2">District de Haute-Bavière</region><settlement type="city">Munich</settlement></placeName></affiliation></author><author><name sortKey="Hansen, W" uniqKey="Hansen W">W. Hansen</name></author><author><name sortKey="Manus, S" uniqKey="Manus S">S. Manus</name></author><author><name sortKey="Luyken, R J" uniqKey="Luyken R">R. J. Luyken</name></author><author><name sortKey="Lorke, A" uniqKey="Lorke A">A. Lorke</name></author><author><name sortKey="Kotthaus, J P" uniqKey="Kotthaus J">J. P. Kotthaus</name></author><author><name sortKey="Huant, S" uniqKey="Huant S">S. Huant</name><affiliation wicri:level="1"><inist:fA14 i1="02"><s1>LMCI-CNRS, 38042 Grenoble, France</s1><sZ>7 aut.</sZ></inist:fA14><country xml:lang="fr">France</country><wicri:regionArea>LMCI-CNRS, 38042 Grenoble</wicri:regionArea><wicri:noRegion>38042 Grenoble</wicri:noRegion><placeName><settlement type="city">Grenoble</settlement><region type="région" nuts="2">Rhône-Alpes</region></placeName></affiliation></author><author><name sortKey="Medeiros Ribeiro, G" uniqKey="Medeiros Ribeiro G">G. Medeiros Ribeiro</name><affiliation wicri:level="2"><inist:fA14 i1="03"><s1>Materials Department and QUEST, University of California, Santa Barbara, California 93106</s1><sZ>8 aut.</sZ></inist:fA14><country xml:lang="fr">États-Unis</country><placeName><region type="state">Californie</region></placeName><wicri:cityArea>Materials Department and QUEST, University of California, Santa Barbara</wicri:cityArea></affiliation></author><author><name sortKey="Petroff, P M" uniqKey="Petroff P">P. M. Petroff</name></author></titleStmt><publicationStmt><idno type="inist">97-0580894</idno><date when="1997-09-15">1997-09-15</date><idno type="stanalyst">PASCAL 97-0580894 AIP</idno><idno type="RBID">Pascal:97-0580894</idno><idno type="wicri:Area/Main/Corpus">018033</idno><idno type="wicri:Area/Main/Repository">017A31</idno><idno type="wicri:Area/France/Extraction">001A88</idno></publicationStmt><seriesStmt><idno type="ISSN">0163-1829</idno><title level="j" type="abbreviated">Phys. rev., B, Condens. matter</title><title level="j" type="main">Physical review. B, Condensed matter</title></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Experimental study</term><term>Ground states</term><term>III-V semiconductors</term><term>Indium compounds</term><term>Quantum interference phenomena</term><term>Semiconductor quantum dots</term><term>Two-dimensional electron gas</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>7320D</term><term>7340Q</term><term>7170G</term><term>Etude expérimentale</term><term>Indium composé</term><term>Semiconducteur III-V</term><term>Point quantique semiconducteur</term><term>Etat fondamental</term><term>Gaz électron 2 dimensions</term><term>Interférence quantique</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">The few-electron ground states of self-assembled InAs quantum dots are investigated using high-resolution capacitance spectroscopy in magnetic fields up to 23 T. The level structure reveals distinct shells which are labeled as s-, p-, and d-like according to their symmetry. Our measurements enable us to resolve the single-electron charging not only of the lowest (s) state with two electrons but also of the second lowest (p) state with four electrons as pronounced maxima in the capacitance spectra. Furthermore, two peaks at higher energy can be attributed to charging of the d shell with the first two electrons. We discuss the energy spectrum in terms of spatial quantization energy, Coulomb blockade, and many-particle effects. At around B=15 T we observe a magnetic-field-induced intermixing of the p and d shell. Additional fine structure in the capacitance spectra is observed and discussed both in terms of nearest-neighbor Coulomb interactions and monolayer fluctuations of the dot size.</div></front></TEI><inist><standard h6="B"><pA><fA01 i1="01" i2="1"><s0>0163-1829</s0></fA01><fA02 i1="01"><s0>PRBMDO</s0></fA02><fA03 i2="1"><s0>Phys. rev., B, Condens. matter</s0></fA03><fA05><s2>56</s2></fA05><fA06><s2>11</s2></fA06><fA08 i1="01" i2="1" l="ENG"><s1>Few-electron ground states of charge-tunable self-assembled quantum dots</s1></fA08><fA11 i1="01" i2="1"><s1>MILLER (B. T.)</s1></fA11><fA11 i1="02" i2="1"><s1>HANSEN (W.)</s1></fA11><fA11 i1="03" i2="1"><s1>MANUS (S.)</s1></fA11><fA11 i1="04" i2="1"><s1>LUYKEN (R. J.)</s1></fA11><fA11 i1="05" i2="1"><s1>LORKE (A.)</s1></fA11><fA11 i1="06" i2="1"><s1>KOTTHAUS (J. P.)</s1></fA11><fA11 i1="07" i2="1"><s1>HUANT (S.)</s1></fA11><fA11 i1="08" i2="1"><s1>MEDEIROS RIBEIRO (G.)</s1></fA11><fA11 i1="09" i2="1"><s1>PETROFF (P. M.)</s1></fA11><fA14 i1="01"><s1>Sektion Physik, LMU Munchen, Geschwister-Scholl-Platz 1, 80539 Munchen, Germany</s1><sZ>1 aut.</sZ></fA14><fA14 i1="02"><s1>LMCI-CNRS, 38042 Grenoble, France</s1><sZ>7 aut.</sZ></fA14><fA14 i1="03"><s1>Materials Department and QUEST, University of California, Santa Barbara, California 93106</s1><sZ>8 aut.</sZ></fA14><fA20><s1>6764-6769</s1></fA20><fA21><s1>1997-09-15</s1></fA21><fA23 i1="01"><s0>ENG</s0></fA23><fA43 i1="01"><s1>INIST</s1><s2>144 B</s2></fA43><fA44><s0>8100</s0><s1>© 1997 American Institute of Physics. All rights reserved.</s1></fA44><fA47 i1="01" i2="1"><s0>97-0580894</s0></fA47><fA60><s1>P</s1></fA60><fA61><s0>A</s0></fA61><fA64 i1="01" i2="1"><s0>Physical review. B, Condensed matter</s0></fA64><fA66 i1="01"><s0>USA</s0></fA66><fC01 i1="01" l="ENG"><s0>The few-electron ground states of self-assembled InAs quantum dots are investigated using high-resolution capacitance spectroscopy in magnetic fields up to 23 T. 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