<div dir="auto"><div dir="auto"><div><div>I am referring to the standard definition of effective masses for the CB & VB, e.g. <a href="https://en.wikipedia.org/wiki/Effective_mass_(solid-state_physics)" target="_blank" rel="noreferrer">https://en.wikipedia.org/wiki/Effective_mass_(solid-state_physics)</a>. This is the tensor at the VB edge for holes and the CB edge for electrons.</div><div dir="auto"><br></div><div dir="auto">From what I can see one has to take the mstar output, do a seperate spaghetti type analysis to find the k-points for the LUMO/HOMO, then extract those by hand from the mstar data dump with, perhaps, some Fermi-Dirac averaging for STP, TEMPS Mermin functional. (There might be a cleaner method than spaghetti to find the HOMO/LUMO k-points.)</div><div><br></div><div data-smartmail="gmail_signature">___<br>Emeritus Professor Laurence Marks (Laurie)<br>Department of Materials Science and Engineering, Northwestern University<br><a href="http://www.numis.northwestern.edu" target="_blank" rel="noreferrer">www.numis.northwestern.edu</a><br>"Research is to see what everybody else has seen, and to think what nobody else has thought" Albert Szent-Györgyi</div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, Apr 9, 2026, 03:47 Rubel, Oleg <<a href="mailto:rubelo@mcmaster.ca" target="_blank" rel="noreferrer">rubelo@mcmaster.ca</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Are you referring to the transport-equivalent effective mass for degenerate bands, perhaps in the sense of Sec. IIIB of this paper on the ABINIT implementation: <a href="https://arxiv.org/abs/1708.05890" rel="noreferrer noreferrer noreferrer" target="_blank">https://arxiv.org/abs/1708.05890</a><br>
mstar uses degenerate perturbation theory and can obtain masses associated with, for example, heavy-hole and light-hole branches. It also reports a conductivity-related mass via Eq. (9) in our paper: <a href="https://rubel75.github.io/publications/2021/Rubel-CPC_261_2021.pdf" rel="noreferrer noreferrer noreferrer" target="_blank">https://rubel75.github.io/publications/2021/Rubel-CPC_261_2021.pdf</a><br>
However, these quantities are still associated with the resolved degenerate manifold, so I am not sure we went as far as the ABINIT implementation in defining a transport-equivalent effective mass for the full degenerate extremum.<br>
<br>
Oleg<br>
> -----Original Message-----<br>
> From: Wien <<a href="mailto:wien-bounces@zeus.theochem.tuwien.ac.at" rel="noreferrer noreferrer" target="_blank">wien-bounces@zeus.theochem.tuwien.ac.at</a>> On Behalf Of<br>
> Laurence Marks<br>
> Sent: Wednesday, April 8, 2026 6:11 PM<br>
> To: A Mailing list for WIEN2k users <<a href="mailto:wien@zeus.theochem.tuwien.ac.at" rel="noreferrer noreferrer" target="_blank">wien@zeus.theochem.tuwien.ac.at</a>><br>
> Subject: Re: [Wien] Effective mass<br>
> <br>
> Caution: External email.<br>
> ..not the decomposition by band and kpoint...<br>
> <br>
> ---<br>
> Emeritus Professor Laurence Marks (Laurie) <a href="http://www.numis.northwestern.edu" rel="noreferrer noreferrer noreferrer" target="_blank">www.numis.northwestern.edu</a><br>
> <<a href="http://www.numis.northwestern.edu" rel="noreferrer noreferrer noreferrer" target="_blank">http://www.numis.northwestern.edu</a>><br>
> <a href="https://scholar.google.com/citations?user=zmHhI9gAAAAJ&hl=en" rel="noreferrer noreferrer noreferrer" target="_blank">https://scholar.google.com/citations?user=zmHhI9gAAAAJ&hl=en</a><br>
> "Research is to see what everybody else has seen, and to think what nobody<br>
> else has thought" Albert Szent-Györgyi<br>
> <br>
> On Wed, Apr 8, 2026, 17:05 Laurence Marks <<a href="mailto:laurence.marks@gmail.com" rel="noreferrer noreferrer" target="_blank">laurence.marks@gmail.com</a><br>
> <mailto:<a href="mailto:laurence.marks@gmail.com" rel="noreferrer noreferrer" target="_blank">laurence.marks@gmail.com</a>> > wrote:<br>
> <br>
> <br>
> It gives them for each band. The conventional definition of electron &<br>
> hole effective masses are at the VB and CB edges, which is what I want, not the<br>
> decomposition by band.<br>
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