My research has been focused on two main areas. First, electronic transports in chiral carbon nanotubes in the presence of charged adatoms. To study such systems we employed recursive Greens function technique to evaluate the conductance using the Landauer formula. Comparing with the experimental data, we determined the effective amplitude and the range of scattering potentials. In addition, using a similar approach we explained qualitatively an unusual conductance feature in a metallic carbon nanotube. The second part of my study was concerned to the dynamical spin injection and spin currents in low-dimensional materials. We have developed an atomistic model to express the injected spin current in terms of the systems Greens function. The new formulation provides a framework to study the spin injection and relaxation of a system with an arbitrary structure.
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Doctor of Philosophy (Ph.D.)
College of Sciences
Length of Campus-only Access
Doctoral Dissertation (Open Access)
Ahmadi, Amin, "Charge and Spin Transport in Low-Dimensional Materials" (2017). Electronic Theses and Dissertations. 5406.
Restricted to the UCF community until May 2017; it will then be open access.