Dear QE users Currently I am doing phonon calculation of bilayer germanene using espresso-5.1 phonon package. When I am use van der waals's effect through exchange-correlation functional(using flag:input_dft='vdW-DF') all phonon mode have imaginary frequencies.
Can anyone please let me know whether phonon with van der Waals functional is implemented or not? With regards Debnath Talukdar IISER Pune
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