Dear all

What does it mean to have a horizontal line in the negative frequency regime of the phonon dispersion modes? I have a Li ion adsorbed at the surface of a heterostructure. The Li ion is at the saddle point. Actually I want to find the zero point energy of the Li ion. Should I consider the negative frequency of Li? or real? The image is attached.

Thank you for your cooperation.

Abdus Samad

Research associate at the University of Ulsan

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