Effective mass in CNT

[ams_nanolab]

Dear Sir,

What would be the parameters to input into the effective mass analyzer to get the effective mass of electron in  semiconducting CNT?

[Anders Blom]

First, make a general band structure so you can see where the minimum is, in terms of k-points. You do not need to hit the exact right point in the Analyzer, you just need the minimum to be covered by the range k-+dk.

The analyzer automatically assigns a relative band index 0 to the lowest conduction band, so you don't have to worry about that.

[ams_nanolab]

Is there a way to know the point like a data cursor or something? Say the point lies somewhere between G-Z (just saying) , how would i know the co-ordinate to input in the analyzer?

[Anders Blom]

Since your cell is probably orthorhombic, 2/3 between G and Z would simply be (0,0,0.6666) for the k-point and then use 001 as direction. If you use a wide enough dk you should see the curvature in the "neighbor bands" plot. Tooltips for bandstructure plots will be included in 13.8.

[ams_nanolab]

Thanks. Also more tools in the plot viewers would be greatly appreciated.