Author Topic: Processes per saddle search  (Read 4672 times)

0 Members and 1 Guest are viewing this topic.

Offline Dipankar Saha

  • Supreme QuantumATK Wizard
  • *****
  • Posts: 516
  • Country: in
  • Reputation: 5
    • View Profile
Processes per saddle search
« on: March 1, 2017, 14:10 »
Hi,

What is this "processes per saddle search" ??

Thanks_
Dipankar

Offline Ulrik G. Vej-Hansen

  • QuantumATK Staff
  • Supreme QuantumATK Wizard
  • *****
  • Posts: 426
  • Country: dk
  • Reputation: 9
    • View Profile
Re: Processes per saddle search
« Reply #1 on: March 1, 2017, 14:18 »
It is used for AKMC calculations, so it has no effect otherwise.

Offline Dipankar Saha

  • Supreme QuantumATK Wizard
  • *****
  • Posts: 516
  • Country: in
  • Reputation: 5
    • View Profile
Re: Processes per saddle search
« Reply #2 on: March 1, 2017, 14:29 »
Okay....  / Thanks Ulrik ...  :)
_____
One more thing that I wanted to ask :

What is purpose of including_"Shift to Gamma"  in k-point sampling??

Offline zh

  • Supreme QuantumATK Wizard
  • *****
  • Posts: 1141
  • Reputation: 24
    • View Profile
Re: Processes per saddle search
« Reply #3 on: March 2, 2017, 01:04 »
"What is purpose of including_"Shift to Gamma" in k-point sampling??"
Impose the Gamma point being included in the k-point sampling, because the BZ center (Gamma point) is the most important k point.

Offline Dipankar Saha

  • Supreme QuantumATK Wizard
  • *****
  • Posts: 516
  • Country: in
  • Reputation: 5
    • View Profile
Re: Processes per saddle search
« Reply #4 on: March 2, 2017, 06:16 »
Thank you Zh ... :)

Offline Petr Khomyakov

  • QuantumATK Staff
  • Supreme QuantumATK Wizard
  • *****
  • Posts: 1290
  • Country: dk
  • Reputation: 25
    • View Profile
Re: Processes per saddle search
« Reply #5 on: March 2, 2017, 09:46 »
Not shifting to the G-point may cause lowering of the symmetry of the k-grid. Having the symmetry of the k-grid lower than that of  the reciprocal lattice might cause breaking the symmetry of numerically-calculated physical quantities, e.g., elasticity tensor, opening band gap in cases for which there should be no gap due to some specific lattice symmetry,  and so on.

Offline Dipankar Saha

  • Supreme QuantumATK Wizard
  • *****
  • Posts: 516
  • Country: in
  • Reputation: 5
    • View Profile
Re: Processes per saddle search
« Reply #6 on: March 2, 2017, 15:29 »
Petr Khomyakov,

Thanks a lot.... :) / Okay... I understand the band gap part...  Perhaps, to verify the 'gap'... it would better if we check that with the DOS_results.... / Is it not? 
______
.............. numerically-calculated physical quantities, e.g., elasticity tensor, opening band gap in cases for which there should be no gap due to some specific lattice symmetry,  and so on.
How the elasticity tensor will  get  affected?  It's all about the total energy and applied strain ... right??

Best_
Dipankar