Dear Chenhai,
Usually what is meaningful is the value of the angle. Given the direction of the magnetization in the sample, the direction depends on the convention used.
Indeed I do not remember the convention adopted in yambo.
I'll try to check and reply here in the next days ... but it maybe faster if you simply take a material (like bulk iron) for which the result is known and check which is the convention used in yambo
Best,
D.
θk
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Davide Sangalli
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Re: θk
Davide Sangalli, PhD
CNR-ISM, Division of Ultrafast Processes in Materials (FLASHit) and MaX Centre
https://sites.google.com/view/davidesangalli
http://www.max-centre.eu/
CNR-ISM, Division of Ultrafast Processes in Materials (FLASHit) and MaX Centre
https://sites.google.com/view/davidesangalli
http://www.max-centre.eu/