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SUMMARY:STEM Cathodoluminescence  of Individual GaN/AlN Quantum Disks with
 in a single Nanowire - Luiz Fernando Zagonel\, Electron Microscopy Laborat
 ory\, Brazilian Synchrotron Light Laboratory
DTSTART:20110624T140000Z
DTEND:20110624T150000Z
UID:TALK31903@talks.cam.ac.uk
CONTACT:Caterina Ducati
DESCRIPTION:In a real devices\, quantum objects might be assembled in clos
 e proximity to better enhance or employ their properties.[1] This creates 
 a great challenge for characterization\, modelling and understanding of su
 ch complex nano-structures. Here\, an optimized cathodoluminescence (CL) s
 ystem implemented in a STEM is employed to access the emission energy of i
 ndividual GaN/AlN Quantum Disks (QDisks) of a stack within single GaN nano
 wires (NW). [2] CL maps with a full spectrum for each point were acquired 
 to distinguish the contribution of different parts of the NWs with high sp
 atial and spectral resolutions. QDisks as small as 1 nm separated by few n
 anometers had their luminescence singled out. Moreover\, the emission wave
 length of each QDisk could be unambiguously related to their individual si
 ze (measured with atomic resolution) and to the morphology of the NW. The 
 results give a clear evidence of the Quantum Confined Stark Effect (QCSE 
 – that is the red shift of the emission due to the electric field) due t
 o internal fields. \n\nReferences: \n[1] L. Rigutti et al. Nano Lett. 2010
 \, 10\, 2939.\n[2] L. F. Zagonel et al.  Nano Lett. 2011\, 11\, 568.\n
LOCATION:T001 [Tower Seminar Room]\, Materials Science and Metallurgy\, De
 partment of
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