A transport spectroscopy experiment based on our work may be able to differentiate between polyhedral and non-polyhedral caps. The modeling of nanotube-metal contact has lagged behind experiments. Prior modeling work including ours, only included idealized semi-inifinite nanotube leads, while experiments involve metallic leads. The modeling of carbon nanotube-metal contacts is important from both basic and applied viewpoints. The present work present results which explain why armchair and metallic-zigzag tubes of comparable diameter will contact a metal differently.
Experiments show that the conductance scales with contact length.
Our calculations show the same phenomena, thereby providing an explanation for the experimental observation. Cun-Zheng Ning, MRJ Technology Solutions, Ext. Semiconductor diode lasers are widely employed for optical interconnects for optical fiber systems for long and short distance communications. Physical principles, however, restrict the modulation speed to 10 to 20 Giga bits per second using the current methods. Rather than modulating the charged carrier density in a semiconductor, this paper proposes to modulate the carrier temperature as a means to get around the slow process of carrier density change.