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Exciton confinement and trapping dynamics in double-graded-bandgap quantum nanowires
Ecole Polytechnique Fédérale de Lausanne, Laboratory of Physics of Nanostructures.
P. N. Lebedev Physical Institute, Russian Academy of Sciences.
Ecole Polytechnique Fédérale de Lausanne, Laboratory of Physics of Nanostructures.
Ecole Polytechnique Fédérale de Lausanne, Laboratory of Physics of Nanostructures.
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2012 (English)In: Applied Physics Letters, Vol. 100, no 21, 211907Article in journal (Refereed) Published
Abstract [en]

We fabricate and study quantum dot structures incorporating quasi-one-dimensional excited states. The structures are realized by graded bandgap GaAs/AlGaAs quantum wires self-formed inside inverted tetrahedral pyramids. The ground state transitions exhibit typical characteristics of fully confined excitons, including single photon emission. Efficient carrier thermalization and relaxation, as well as correlated photon emission is observed also among the excited states, indicating the formation of quasi-one-dimensional multi-exciton states. These structures offer interesting possibilities for collecting and directing charge carriers towards heterostructured potential traps.

Place, publisher, year, edition, pages
2012. Vol. 100, no 21, 211907
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Condensed Matter Physics
Identifiers
URN: urn:nbn:se:liu:diva-118680DOI: 10.1063/1.4721660OAI: oai:DiVA.org:liu-118680DiVA: diva2:816409
Available from: 2015-06-03 Created: 2015-06-03 Last updated: 2015-10-22

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Publisher's full texthttp://scitation.aip.org/content/aip/journal/apl/100/21/10.1063/1.4721660

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Karlsson, K Fredrik
Condensed Matter Physics

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