Difference between revisions of "Solution LAB3 CNT"
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In order to build the cell we can use a CNT generator, several options available: | In order to build the cell we can use a CNT generator, several options available: | ||
| + | ==Step 1== | ||
*go to CNT generator http://turin.nss.udel.edu/research/tubegenonline.html | *go to CNT generator http://turin.nss.udel.edu/research/tubegenonline.html | ||
*For simplicity set the crystal cell as cubic | *For simplicity set the crystal cell as cubic | ||
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Suggestions: (Use ibrav=8, set an arbitrary amount of vacuum, and set cilldm(3)=c/a) | Suggestions: (Use ibrav=8, set an arbitrary amount of vacuum, and set cilldm(3)=c/a) | ||
*Visualize the structure using xcrysden | *Visualize the structure using xcrysden | ||
| + | |||
| + | ==Step 2== | ||
| + | *You can use cell_dofree='z' to relax the cell parameter along the tube axis | ||
| + | *Set a value of k-points (along z) not tool large (12 or 24 should be enough) | ||
Revision as of 19:04, 1 April 2021
- Back to the previous page: Electronic properties of 2D and 1D systems#Exercise 3: A small Carbon nanotube (CNT)
In order to build the cell we can use a CNT generator, several options available:
Step 1
- go to CNT generator http://turin.nss.udel.edu/research/tubegenonline.html
- For simplicity set the crystal cell as cubic
- Choose a format with PBC (e.g. PDB with PBC). Note that the units are in Angstrom.
- In building the input file: Note the tube axis is along z.
Suggestions: (Use ibrav=8, set an arbitrary amount of vacuum, and set cilldm(3)=c/a)
- Visualize the structure using xcrysden
Step 2
- You can use cell_dofree='z' to relax the cell parameter along the tube axis
- Set a value of k-points (along z) not tool large (12 or 24 should be enough)