Hi,
The calculation of carrier concentration assumes the Fermi level is in the gap. The concentration at the order of 10^21 is rather high. So it may be near the band edge. Please check the doped Fermi level carefully. Or you can start from a lower carrier concentration, like 10^16
Best,
Zhe
Search found 14 matches
- Fri Mar 07, 2025 3:15 am
- Forum: General discussion
- Topic: Discrepancy between input and output Electronic Density
- Replies: 5
- Views: 49689
- Mon Nov 18, 2024 10:28 pm
- Forum: General discussion
- Topic: I can not obtain the n/p-type transport of graphene at 1E15 cm-2
- Replies: 2
- Views: 12187
Re: I can not obtain the n/p-type transport of graphene at 1E15 cm-2
Hi, I have two comments on the input file. 1. 1.E-15 cm^-2 is far too large for a 2 dimension system. It can be found that the doped Fermi level ( -6.8129 and -1.9614) is far from the input one (-4.228393) 2. As we know, graphene is a semi-metal, which is incompatible with carrier and ncarrier. They ...
- Mon Nov 18, 2024 10:15 pm
- Forum: General discussion
- Topic: Symmetry of k-points and velocities
- Replies: 2
- Views: 9182
Re: Symmetry of k-points and velocities
Dear Yan, A well symmetry of energies or velocities relies on a well Wannierization. We have a well-tested example of silicon in PHYSICAL REVIEW RESEARCH 3, 043022 (2021) and you can download input files from https://archive.materialscloud.org/record/2021.94 I did the same test as you described with ...
- Mon Apr 15, 2019 12:23 pm
- Forum: General discussion
- Topic: Electron-Phonon coupling 2D-MoS2 (EPW5.1)
- Replies: 8
- Views: 13284
Re: Electron-Phonon coupling 2D-MoS2 (EPW5.1)
Dear Sara,
I find that you used different types of pseudopotential(PP) for Mo(NC) and S(US).
Maybe you could check the band structure and replace one of PPs.
Best Regards
Zhe
I find that you used different types of pseudopotential(PP) for Mo(NC) and S(US).
Maybe you could check the band structure and replace one of PPs.
Best Regards
Zhe
- Sat Apr 13, 2019 5:57 am
- Forum: General discussion
- Topic: Electron-Phonon coupling 2D-MoS2 (EPW5.1)
- Replies: 8
- Views: 13284
Re: Electron-Phonon coupling 2D-MoS2 (EPW5.1)
Dear Sara, Sorry, I misunderstood your purpose before. (1)If you just want to calculate the e-ph matrix, the Ef is meaningless. It works on the calculation of mobility by changing the Fermi-Dirac distribution. Maybe you can check the wannierized band structure and the convergence of e-ph in real ...
- Fri Apr 12, 2019 10:39 am
- Forum: General discussion
- Topic: Electron-Phonon coupling 2D-MoS2 (EPW5.1)
- Replies: 8
- Views: 13284
Re: Electron-Phonon coupling 2D-MoS2 (EPW5.1)
Dear Sara, (1) Fermi energy depends on doping. The smearing method can only calculate the undoped case. Actually, it is the relation between Ef and carrier concentration that matters. (2) Sorry for my poor expression. I mean, if you set fsthick = 15.0, the problem below will disappear. A selecq.fmt ...
- Mon Apr 08, 2019 11:25 am
- Forum: General discussion
- Topic: Electron-Phonon coupling 2D-MoS2 (EPW5.1)
- Replies: 8
- Views: 13284
Re: Electron-Phonon coupling 2D-MoS2 (EPW5.1)
Dear Sara, In my opinion, (1) You don't need to set the Ef in the middle of the gap. If you want to calculate an N-type MoS2, a Ef near the conductive band might be better. (2) You need a larger fsthick. EPW filter those q points that both E_k and E_k+q are within Ef +/- fsthick for at least one k ...
- Wed Mar 20, 2019 2:17 am
- Forum: General discussion
- Topic: Gets stuck at wannierize when running EPW v5.1.0
- Replies: 4
- Views: 7279
Re: Gets stuck at wannierize when running EPW v5.1.0
ilias-serifi wrote:HI![]()
where can i found this new version of epw i enter to the home page and i didn't found EPW v5.1.0
Best regard
Hi,
You just need to download the entire QE-6.4.
http://www.quantum-espresso.org/news-ev ... esso-v-6-4
Best Regards
- Tue Mar 19, 2019 9:24 am
- Forum: General discussion
- Topic: Gets stuck at wannierize when running EPW v5.1.0
- Replies: 4
- Views: 7279
Re: Gets stuck at wannierize when running EPW v5.1.0
Update
I run EPW without parallel and this problem disappears.
I think this problem is due to a bug of the parallel of wannier90 as library.
I run EPW without parallel and this problem disappears.
I think this problem is due to a bug of the parallel of wannier90 as library.
- Tue Mar 19, 2019 3:05 am
- Forum: General discussion
- Topic: Gets stuck at wannierize when running EPW v5.1.0
- Replies: 4
- Views: 7279
Gets stuck at wannierize when running EPW v5.1.0
Hi, I'm trying to use the latest version v5.1.0. But my task gets stuck at wannierize process. 1. This task has been perfectly run in v5.0.0(qe-6.3). 2. And a single Wannier90 v3.0.0 process also works. 3. Then I run the diamond example and get the same problem. So it seems not an individual ...