Dear Andrey,
The transferred momentum is specified in Cartesian coordinates, in units of 2*pi/a, where 'a' is the lattice parameter (please see q-e/TDDFPT/Doc/INPUT_EELS.txt). > How to find suitable direction for transferred momentum You can specify q = (q1, q2, q3) in any direction you want (e.g. check the Brillouin zone for your system, and see in particular which high-symmetry direction you have). Maybe you can check the literature, pick up some specific direction for a specific material, and try to reproduce the published result. This should give you an idea how it works. Greetings, Iurii -- Dr. Iurii Timrov Postdoctoral Researcher STI - IMX - THEOS and NCCR - MARVEL Swiss Federal Institute of Technology Lausanne (EPFL) CH-1015 Lausanne, Switzerland +41 21 69 34 881 http://people.epfl.ch/265334 ________________________________ From: users <users-boun...@lists.quantum-espresso.org> on behalf of Andrey Chibisov <andreichibi...@yandex.ru> Sent: Sunday, July 19, 2020 8:50:38 AM To: Quantum ESPRESSO users Forum Subject: [QE-users] How to find suitable direction for transferred momentum qi in turbo_eels.x code Dear colleagues, I try to calculate EELS spectra for graphene/hBN (two single layer). How to find suitable direction for transferred momentum qi in turbo_eels.x code for this system? I need to find acoustic plasmons modes -- Best regards, Dr. Andrey Chibisov, Ph.D. Senior Researcher, Laboratory of Numerical Methods in Mathematical Physics, Computing Center of the Russian Academy of Sciences. Khabarovsk, Russia Web page: https://www.researchgate.net/profile/A_Chibisov https://www.linkedin.com/in/andrey-chibisov-98625355/
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