Quantum Optoelectronics

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Characterization of tunneling and free-carrier screening in coupled asymmetric GaN/AlGaN quantum discs

AIP CONF PROC 893 (2007) 1003-1004

Authors:

KH Lee, JH Na, S Birner, SN Yi, RA Taylor, YS Park, CM Park, TW Kang

Abstract:

We present a systematic investigation of free-carrier screening in coupled asymmetric GaN quantum discs with embedded AlGaN barriers using time-integrated and time-resolved micro-photoluminescence measurements, supported by three-dimensional multi-band k.p computational modeling. Free-carrier screening effects decreased with the barrier thickness, which indicates that the source of the free-carriers were carriers tunneling through the barrier.
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Comparison of exciton optical nonlinearities for resonant and non-resonant excitation

JOURNAL OF THE KOREAN PHYSICAL SOCIETY 51:1 (2007) 149-154

Authors:

K Kyhn, RA Taylor
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Creating diamond color centers for quantum optical applications

DIAMOND AND RELATED MATERIALS 16:11 (2007) 1887-1895

Authors:

FC Waldermann, P Olivero, J Nunn, K Surmacz, ZY Wang, D Jaksch, RA Taylor, IA Walmsley, M Draganski, P Reichart, AD Greentree, DN Jamieson, S Prawer
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Magneto-optical studies of single-wall carbon nanotubes

PHYSICAL REVIEW B 76:8 (2007) ARTN 085404

Authors:

IB Mortimer, L-J Li, RA Taylor, GLJA Rikken, O Portugall, RJ Nicholas
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Optical studies of non-linear absorption in single InGaN/GaN quantum dots

AIP CONF PROC 893 (2007) 953-954

Authors:

AF Jarjour, RA Taylor, RW Martin, IM Watson, RA Oliver, GAD Briggs, MJ Kappers, CJ Humphreys

Abstract:

Nficro-photoluminescence properties of single InGaN/GaN quantum dots (QDs) are investigated using sub-bandgap excitation by 1 ps pulses from a Ti:sapphire laser. This results in almost complete suppression of background emission arising from the underlying quantum well to which the QDs are coupled. Photoluminescence excitation spectra undertaken using this technique show evidence of p-states. The non-linear intensity dependence of the emission is also discussed.
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