[IEEE 2006 International Conference on Numerical Simulation of Semiconductor Optoelectronic Devices - Nanyang Technological University, Nanyang Executive Centre, Singapore, China (2006.09.11-2006.09.14)] 2006 International Conference on Numerical Simulation of Semiconductor Optoelectronic Devices - 2006 International Conference on Numerical Simulation of Semiconductor Optoelectronic Devices