1998
DOI: 10.1063/1.122524
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Electrical detection of optically induced charge storage in self-assembled InAs quantum dots

Abstract: Spectrally resolved photoresistance investigations of charge storage effects in self-assembled InAs quantum dots (QDs) are reported. Resonant optical excitation of the QDs produces a strong increase of the lateral resistance of a spatially separated electron channel (ΔR) which reflects the stored charge density. This photoresponse is persistent for many hours at 145 K and can be controllably reversed electrically. Pronounced oscillations observed in the spectral variation ΔR are shown to reflect the excitation… Show more

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Cited by 181 publications
(106 citation statements)
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“…Das zunehmende Interesse an Quantenpunktstrukturen wird neben grundlagenorientierten Fragen durch potentielle Anwendungen in Bauelementen wie Halbleiterlasem motiviert, die von den atomartigen Ubergangen profitieren sollten [2]. Eine andere denkbare Anwendung sind Ladungsspeicher, die die Besetzung der diskreten Energieniveaus mit einzelnen Ladungen und beispielsweise die daraus resultierenden veranderten Transporteigenschaften eines benachbarten Elektronenkanals ausnutzen [3].…”
Section: Introductionunclassified
“…Das zunehmende Interesse an Quantenpunktstrukturen wird neben grundlagenorientierten Fragen durch potentielle Anwendungen in Bauelementen wie Halbleiterlasem motiviert, die von den atomartigen Ubergangen profitieren sollten [2]. Eine andere denkbare Anwendung sind Ladungsspeicher, die die Besetzung der diskreten Energieniveaus mit einzelnen Ladungen und beispielsweise die daraus resultierenden veranderten Transporteigenschaften eines benachbarten Elektronenkanals ausnutzen [3].…”
Section: Introductionunclassified
“…Previous reports demonstrate that when cooled to 4 K, QDOGFETs exhibit single-photon sensitivity with high internal quantum efficiency (Rowe et al, 2006) and, moreover, can accurately discriminate between the detection of 0, 1, 2, and 3 photons 83% of the time (Gansen et al, 2007;Rowe et al, 2008). While persistent photoconductivity lasting for hours has been demonstrated for temperatures as high as 145 K (Finley et al, 1998), previous demonstrations of the single-photon sensitivity of QDOGFETs have been limited to operating temperatures of 4 K, where thermally activated noise sources are minimized. Here we present the results of a systematic study, where we measured the noise spectra of a QDOGFET for different sample temperatures and use a mathematical framework that was recently developed to determine how the sensitivity of the detector will vary with temperature.…”
Section: Introductionmentioning
confidence: 99%
“…The unique optical and electrical properties of such quantum dots stimulated intense research activities, and some novel optoelectronic devices such as quantum-dot lasers, 1 optical memory structure, [2][3][4] and lateral intersubband detectors 5,6 have been demonstrated.…”
mentioning
confidence: 99%