dc.contributor.advisor |
Cosby, Ronald M. |
en_US |
dc.contributor.author |
Vasthari, Sudhendra |
en_US |
dc.date.accessioned |
2011-06-03T19:40:09Z |
|
dc.date.available |
2011-06-03T19:40:09Z |
|
dc.date.created |
2007 |
en_US |
dc.date.issued |
2007 |
|
dc.identifier |
LD2489.Z9 2007 .V37 |
en_US |
dc.identifier.uri |
http://cardinalscholar.bsu.edu/handle/handle/187698 |
|
dc.description.abstract |
The electronic structure is determined for different carbon structures like carbon six chain, infinite graphene sheet, and different nanotubes. Electron transport properties of bare metallic carbon nanotubes (CNT) and a CNT with a single Barium atom are studied using the software Virtual NanoLab (VNL) and Atomistix ToolKit (ATK). The software combines advanced numerical methods, such as non-equilibrium Green's functions (NEGF) and density functional theory (DFT), to describe the detailed electronic structure of these carbon structures. Advanced numerical algorithms enable the application of a bias voltage across the structure, as well as the calculation and analysis of current-voltage characteristics of two-probe nanotubes.NanoLanguage scripts are written to generate and calculate the current for a two-probe bare CNT and a CNT with a single Barium atom. The currents thus obtained for different voltages are imported into Poly Software International (PSI) Plot spreadsheet and the current-voltage curves are plotted and compared for both the CNTs. The data is further analyzed and differential conductance is calculated and plotted for comparison. The current-voltage (IV) curves exhibit linearity for low voltages. Above a critical voltage, the IV curves flatten and exhibit features where sharp changes occur in the differential conductance. Adding a single Barium atom dramatically affects the conductance of the carbon nanotubes. |
en_US |
dc.description.sponsorship |
Department of Physics and Astronomy |
|
dc.format.extent |
vi, 76 leaves : ill. (chiefly col.) ; 28 cm. |
en_US |
dc.source |
Virtual Press |
en_US |
dc.subject.lcsh |
Carbon -- Electric properties -- Computer simulation. |
en_US |
dc.subject.lcsh |
Carbon -- Transport properties -- Computer simulation. |
en_US |
dc.subject.lcsh |
Nanotubes -- Computer simulation. |
en_US |
dc.title |
Electronic and transport properties of carbon structures |
en_US |
dc.type |
Research paper (M.A.), 3 hrs. |
en_US |
dc.description.degree |
Thesis (M.A.) |
en_US |
dc.identifier.cardcat-url |
http://liblink.bsu.edu/catkey/1380845 |
en_US |