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Questions related to phonons as applicable to the field of materials science.

2 votes
0 answers
149 views

QuantumEspresso phonon calculations stops abruptly with no error

I was trying to calculate phonon dispersion relations of a monolayer MoS2. I've run an Scf calculations with this input file: &CONTROL calculation = 'scf' prefix = 'MoS2_1Layer_ph' pseudo_dir = '/home …
CoolerThanACooler's user avatar
2 votes
1 answer
192 views

Question regarding q2r in QuantumEspresso Phonon Calculation

Let's suppose I've already run an scf calculation for an input file. Now I can read the wave functions and with ph.x I can get the dynamical matrices. I'll get as many files as the number of q-points …
CoolerThanACooler's user avatar
2 votes
0 answers
281 views

How does Quantum Espresso calculate the dynamical matrices before IFCs in ph.x?

I had a theoretical crisis while I was reading this tutorial. I know about Density Functional Perturbation Theory(DFPT) and I know that we can approximate the Inter-atomic Force Constants (IFCs) using …
CoolerThanACooler's user avatar
2 votes
0 answers
52 views

Phonon calculations stopped but my computer says it's still running

I have this after typing an htop and all of the CPUs are used but my output file stopped updating 3 hours ago like this: Should I kill this process? I started this calculation yesterday at 16:00 an …
CoolerThanACooler's user avatar