What does a horizontal band in the Phonon band structure mean?

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asgharali_jan
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What does a horizontal band in the Phonon band structure mean?

#1 Post by asgharali_jan » Fri Apr 19, 2024 11:21 am

if i have a horzental straight band in phonon despersion what does that means? whats physics behind that band?

michael_wolloch
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Re: What does a horizontal band in the Phonon band structure mean?

#2 Post by michael_wolloch » Fri Apr 19, 2024 11:56 am

Dear asgharali_jan,

since this post is not directly related to the usage of VASP, I moved it to the "From users for users" section of the forum.

Flat bands can signify interesting physics. I want to give the discussions by the users a jump start by linking two papers:

Phys. stat. sol. (c) 1, No. 11, 3043–3046 (2004) discusses the construction of flat phonon bands in a 2D lattice by tuning the force constant matrix.

Science 369, 1343-1347 (2020) discusses ferroelectricity in HfO2 induced by flat phonon bands.

Cheers, Michael

asgharali_jan
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Re: What does a horizontal band in the Phonon band structure mean?

#3 Post by asgharali_jan » Sun Apr 21, 2024 9:11 am

:) thanks a lot for information

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