دانلود مقاله Theoretical modeling for Gigahertz Absorption in Metallic Carbon Nanotubes by Considering Spin-Orbit Interaction and Magnetic Field
سال انتشار: ۱۳۸۸
محل انتشار: سومین کنفرانس نانوساختارها
تعداد صفحات: ۴
Maryam Sanaee – School of Electrical and Computer Engineering, Shiraz University, 71936, Iran
Mohammad Hossein Sheikhi – Nanotechnology Research Institute, Shiraz University, 71936-16511, Iran
We have studied band diagrams of different CNTs in tight binding approach, by considering the SOI and magnetic field modification in circumferential k-vectors. The calculated gaps in metallic CNTs are in good agreement with recent experimental results. From the zone-folding point of view, in all armchair SCWNTs with any radii, the energy gap is absent, but in such CNTs, the selection rules show that the transition between the lowest conduction and top valence subbands is forbidden. However, in the so-called quasi metallic SWCNTs with n − m = 3p , where p is an integer, this transition is permissible. Our results show that the SOI created gap corresponded to gigahertz frequency can be tuned by magnetic field and observable in absorption spectra.