Author Topic: Eff mass fitting plots  (Read 2974 times)

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Offline ams_nanolab

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Eff mass fitting plots
« on: February 11, 2017, 10:26 »
Hi,

To get the effective mass fitting plots in ATK 2016.3 I am trying the Local Bandstructure as in
http://docs.quantumwise.com/tutorials/inas_2d_mgga/inas_2d_mgga.html

But how to fit the top of the band in a symmetric way (i mean the two arms of the parabola/ fitting curve)?

What I see is just half of the parabola. This is true for points intermediate between G and Z also.
« Last Edit: February 11, 2017, 13:11 by ams_nanolab »

Offline Daniele Stradi

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Re: Eff mass fitting plots
« Reply #1 on: February 13, 2017, 11:18 »
Hi,

I don't think it is correct to fit the effective mass using a band structure calculated along a path along the Brillouin zone, e.g. X -> G -> L, because the effective mass is defined along a specific direction of the Brillouin zone, e.g. [100].

Hence you can only fit the effective mass along a certain direction of the Brillouin zone (e.g. G->Z).

Regards,
Daniele.

Offline ams_nanolab

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Re: Eff mass fitting plots
« Reply #2 on: February 13, 2017, 11:52 »
Okay, thats good. But how about Z-G-Z It's the same direction but would include both sides of the parabola? Does it affect accuracy or is it the same?

Offline Anders Blom

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Re: Eff mass fitting plots
« Reply #3 on: February 13, 2017, 12:41 »
Same.