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METHOD:PUBLISH
X-WR-CALNAME;VALUE=TEXT:糖心原创
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TZID:America/New_York
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DTSTART:20191103T020000
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DTSTART:20200308T020000
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BEGIN:VEVENT
UID:calendar.383986.field_event_date.0@www.wright.edu
DTSTAMP:20260219T180533Z
CREATED:20200123T161346Z
DESCRIPTION:COOPERATIVE PHENOMENA IN DENSE QUANTUM-DOT ARRAYS*E.R. Brown an
 d W-D. Zhang糖心原创 Physics Departmentelliott.brown@wright
 .edu \; weidong.zhang@wright.edu聽AbstractQuantum dots have long been a par
 adigm of nanoscience and are being used worldwide in many fields from cond
 ensed-matter physics to biomedicine.聽 Recently we have been studying a typ
 e of quantum dot made of crystalline ErAs embedded in GaAs and formed spon
 taneously by heavy doping concentration of Er (~4x1020 cm-3) during MBE gr
 owth.聽 The ErAs quantum dots have quasi-spherical diameters in the range 2
 .0-2.5 nm\, a density >1x1018 cm-3 and a random distribution over a 1 um t
 hick epitaxial layer. 聽At this density the quantum dots are in close enoug
 h proximity that cooperative phenomena can be observed.聽 This presentation
  will cover two such phenomena: (1) cooperative optical spontaneous emissi
 on at room temperature when driven by l = 1550 nm\, femtosecond laser puls
 es\; and (2) cooperative electrical transport up to at least 77 K in the f
 orm of correlated tunneling (or hopping) between adjacent quantum dots.聽 T
 he first has led to the observation of (Dicke) 鈥渟uperradiance鈥� at THz freq
 uencies\, and the second to the discovery of a metal-insulator phase trans
 ition (thought to be Mott type)\, along with giant magnetoresistance in th
 e metallic state.*This research was supported primarily by the U.S. Army R
 esearch Office (Dr. Joe Qiu)\, and to a lesser extent by the Air Force Res
 earch Laboratory (Dr. Rob Ewing)
DTSTART;TZID=America/New_York:20200129T122000
DTEND;TZID=America/New_York:20200129T131500
LAST-MODIFIED:20200123T220303Z
LOCATION:132 Oelman Hall
SUMMARY:Physics seminar: 'Cooperative phenomena in dense quantum-dot arrays
 '
URL;TYPE=URI:/events/physics-seminar-cooperative-phen
 omena-dense-quantum-dot-arrays
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