Questions tagged [vasp]

For questions about use of the Vienna Ab initio Simulation Package (VASP).

Filter by
Sorted by
Tagged with
2
votes
0answers
21 views

What parameters are needed to calculate the Dzyaloshinskii-Moriya interaction (DMI) using VASP?

I want to calculate the Dzyaloshinskii-Moriya interaction (DMI) at the interface of the Co/Pt structure. This Hamiltonian is written in the following form: \begin{align} H=D_{ij}(S_{i}\times{S_{j}}) \...
10
votes
1answer
63 views

Translating fractional coordinates resulting from conventional cell and primitive cell

I have calculated the band structure of some material where the unit cell was the conventional one (i.e. the lattice vectors are orthogonal). I'm trying now to calculate the same band structure only ...
7
votes
0answers
107 views

How to build amorphous Al2O3 using the AIMD method implemented in VASP?

I want to build amorphous Al$_2$O$_3$ with the AIMD (ab-initio molecular dynamics) method implemented in VASP. I know that two procedures should be taken into account, namely 1st: melt 2nd: quench ...
8
votes
1answer
207 views

How to extract lattice constants a and c from relaxed hexagonal structure using VASP?

Taking a bulk WS$_2$ (bilayer) structure and relaxing it with ISIF=3 and IVDW=10 (DFT-D2 method) using the VASP code. Then ...
6
votes
0answers
56 views

How to optimize the geometry of beta PHB in VASP?

I would like to calculate the elastic constants of beta PHB. From this paper. I know that it has P3221 space group. The beta PHB has upward and downward chains, which exist at one lattice site with 50%...
9
votes
1answer
186 views

Increasing k-point grid to take DOS calculation

I was trying to compute some electronic properties for Pd using SIESTA and VASP for some computer practicals in my university, specially focused on band structure and density of states (DOS) using LDA ...
16
votes
1answer
266 views

How to separate the data plot for spin up and spin down band structure into 2 different graphs, in Pymatgen?

I am a beginner user of the Pymatgen package. In order to process the data from VASP DFT calculation software, I use Pymatgen to visualize the output band structure. When I do spin polarised band ...
7
votes
1answer
66 views

How to choose a different band path for band structure calculation using VASP?

How can I set a different band path for VASP calculation? For example I want to plot KGMK but not GMKG for graphene?
6
votes
0answers
38 views

Is there a database where one can find the Electron Density data of materials?

The database I am looking for may be experimental, computational or user-generated data. If I end up using the data, I will be providing the necessary citations and credits. Thank You.
7
votes
2answers
51 views

How to take periodic snapshots while running a simulation in VASP?

Same question, rephrased: What is the procedure to take snapshots at fixed intervals while running an AIMD or DFT Simulation in VASP? OR Which parameter in the INCAR file do I modify to achieve ...
8
votes
1answer
98 views

How to create the structure file for these materials?

I want to create a POSCAR or CIF file file for the monolayers with the data mentioned in the table below : Knowing that the spacegroup is : R-3 (148) Could you please create the POSCAR/CIF for these ...
4
votes
0answers
41 views

Should I add vdW interaction to estimate chemical potential of metallic elements?

I am considering layered oxides $\ce{LiCoO2}$. Previous papers suggested that vdW interaction should be added to get lattice parameters closer to experimental data. I would like to dope other elements ...
7
votes
1answer
174 views

How to generate Electron Density Fields using DFT?

How may I generate Electron Density Field information using Density Functional Theory calculations? What would my required inputs be like in VASP or Quantum ESPRESSO?
7
votes
2answers
140 views

Why is there a large discrepancy between calculated frequency dependent dielectric function and experimental measurement?

I am calculating the frequency dependent dielectric function of $\ce{SiC}$ using VASP. After a geometry optimization, the INCAR file below is used for the ...
9
votes
1answer
84 views

Why VASP calculates the elastic constant for another trigonal space group?

Please, help me to understand the problem. I calculated the elastic constants for the beta PHB (Space group P3221 (154)), it has to show the reduced elastic constant matrix (six), however, ...
5
votes
0answers
50 views

How to do a Sampling on the boundary of Brillouin zone in VASP

I use VASP to do my DFT calculation. I have to do a self consistent calculation to generate my CHGCAR. I want to ask is there anyway to write the KPOINTS file to generate K-meshing grid which can ...
12
votes
1answer
52 views

What does this temperature & total free energy profile mean (obtained from VASP NVT molecular dynamics simulations)?

In order to obtain molecular dynamics (MD) simulations trajectory for computing phonon dispersion relation at finite temperature, I performed NVT MD simulation using VASP for my target system. Here is ...
8
votes
1answer
49 views

When import volumetric data (spin density of CHGCAR) to VESTA which option should we pick here?

I am trying to plot SPIN DENSITY isosurfaces using VESTA. I have used vaspkit option 312 to create ...
11
votes
0answers
109 views

Inconsistent data of chemical potential from different papers

I am looking for chemical potential from literature.$^{1,2}$ I compared the method and data they provided. They use the Fitted Elemental Reference Energy method via GGA+U on VASP employing PAW. U ...
7
votes
0answers
98 views

The gap was open when I was doing an HSE + SOC DFT calculation

I used VASP as my DFT software to do a calculation on an anti-perovskite crystal. I try to reproduce the band structure from literature which was calculated based on HSE + SOC calculation. Their ...
7
votes
0answers
43 views

Single electron transfer periodic DFT in VASP

I have the following question: I am currently studying the electrocatalytic CO2RR on Cu materials using periodic DFT calculations and I am using the CHE model to describe the proton electron transfer ...
6
votes
1answer
39 views

How to make this DOS plot more smooth and add more points around Fermi level?

I have calculated and plotted the DOS for a doped monolayer 3x3x1 supercell. I want to make the plot more smooth and add more points around Fermi level. Knowing that these are my settings for the ...
7
votes
2answers
78 views

How to use gnuplot to draw Bandstructure and DOS from VASP outputs?

I am wondering if you could show me how to use gnuplot to draw bandstructure and DOS plots starting from VASP outputs. If you have any scripts please share them with us. Thanks.
8
votes
1answer
122 views

How can I find the binding energy for exciton (optical gap) with VASP?

What is the best way to find the binding energy for exciton using VASP? I have heard about the method of calculating it through the dielectric tensor with local ...
9
votes
1answer
142 views

SCAN-RVV10 geometry optimization

I'm using SCAN-RVV10 to optimize the hexagonal-BN but the optimized geometry doesn't look true as the calculated interlayer distance is far smaller than the experimental value(exp=3.35 Aangstrom, calc=...
4
votes
1answer
143 views

How to change the spin-orbit coupling strength in VASP?

Since the effect of spin-orbit coupling plays an important role in a topological insulator, How to change the spin-orbit coupling strength in VASP?
8
votes
1answer
51 views

What are the input parameters of VASP for 2D material geometry optimization?

Apparently, my input parameters are not good for geometry relaxation of 2D materials using VASP. ...
13
votes
3answers
425 views

Geometry optimization for n-layers in VASP

What is the best way to optimize monolayer geometry in VASP? Should the same method be used for an n-layer (n=2,3,4,5)?
8
votes
4answers
2k views

How do I search for a particular string in Linux?

I want to search for a value in the VASP OUTCAR file i.e the format of the line should be Volume of Typ 1: 98.5 % What ...
5
votes
1answer
53 views

Divergence behaviour of surface energy

By definition, the surface energy of a thin film or a slab model is defined as $$ \sigma = \frac{1}{2A}(E_{slab} - N\cdot E_{bulk}) $$ where $N$ is the number of atoms in the thin film and $E_{bulk}$ ...
4
votes
1answer
110 views

How to interpret spin density isosurface figures?

The figure below shows the spin density isosurfaces of 3x3x1 ScS2 monolayer supercell doped with Mn atoms. This figure was generated using VASPKIT and ...
6
votes
1answer
84 views

What is the best setting for this workstation to speed up VASP calculations?

I am working on HP workstation with : 128 GB of RAM INTEL(R) XEON E5-2620 V3 with 12 cores What are the best settings of NCORE, ...
6
votes
1answer
43 views

What is the meaning of EATOM tag in the POTCAR files of VASP?

I am wondering what is the meaning of EATOM tag in the POTCAR files of VASP. What is its relationship with the energy of an ...
11
votes
0answers
65 views

Calculation of Gibbs free energy of Mg+ ion using VASP [closed]

I am trying to replicate the $\Delta G_0$ part from this paper. According to the paper, $\Delta G_0$ is 30% of the difference between atomic energy for per $\ce{Mg}$ atom in the bulk structure and the ...
9
votes
2answers
244 views

How to make a good HSE06 bandstructure for TMDC monolayer material (e.g.: WS2) in terms of VASP calculation INPUTS?

I want to perform HSE06 band-structure calculation of a WS2 monolayerwhich has the following POSCAR with ...
12
votes
2answers
569 views

mBJ-LDA band structure calculation using VASP

I tried to create a band structure with the mBJ-LDA method using VASP. I found information that the KPOINTS file should be created according to the "0-weight (...
10
votes
1answer
104 views

How to remove the fake k-points from vasprun.xml file in the calculation of HSE06 band structure?

Is there any script that can remove fake k-points from a vasprun.xml file for HSE06 band structure calculation? Because removing it manually is a time-consuming ...
5
votes
1answer
72 views

How do I extract the wave function from a VASP calculation?

We can obtain a energy band structure of a crystal from a DFT calculation in Vasp. Each point in each band represents an energy eigenvalue with a corresponding wave function from the Schrödinger ...
8
votes
1answer
66 views

Calculation of linear coefficient of thermal expansion using VASP-Phonopy for Hexagonal material

We use quasi-harmonic approximation using VASP-Phonopy. In whole calculation we only assume Free energy as function of volume but in case of HCP material which have ...
5
votes
1answer
68 views

Formation energy calculation

I am trying to calculate the formation energy of $\ce{Mg2Si}$ and for the calculation of lowest energy configuration of Bulk $\ce{Si}$: $E(\ce{Si})$ and bulk Mg $E(\ce{Mg})$. I have opted for both ...
7
votes
1answer
84 views

Band structure calculation

I want to do band structure calculation of Magnesium silicide for GGA in VASP. Can anyone please help how to do this by setting initial ...
8
votes
1answer
55 views

How to solve this Bandup software problem?

I have compiled the Bandup software using this command : ./build -compiler gfortran. After that, I tried to follow the tutorial inside the directory ...
8
votes
2answers
301 views

What is the maximum allowed doping concentration?

Let's consider an example of a 3x3x1 supercell of WS2 monolayer which has 9 W atoms. If we substitute two of them with 2 dopants, the concentration will be 2/9 ...
11
votes
1answer
215 views

Number of KPOINTS in irreducible part of Brillouin zone

I want to investigate the comparison of Total Energy per cell with respect to the number of KPOINTS in the irreducible part of the Brillouin zone but I do not know ...
11
votes
1answer
95 views

Binding energy calculation for Zn atom on armchair graphene slab?

I am trying to repeat the result of this paper for Zn absorbed on the armchair graphene slab. The relaxed top and side structures are the following: The relaxed structure is almost the same as the ...
7
votes
1answer
61 views

How to calculate E_TM in the formation energy formulas?

I found in the literature that the formation energy of doped supercell (e.g.: 4x4x1 supercell with one dopant atom) has many formulas, and the most common one is : $...
6
votes
1answer
79 views

How to set NCORE, KPAR and NBANDS to speed up calculations on VASP?

I am searching of how to set the tags NCORE, KPAR and NBANDS on a specific systems to speed up calculations. Could you please tell me the rules to follow ?
5
votes
2answers
91 views

What is the RWIGS value for the DOS calculation in VASP?

I want to set the RWIGS value in the INCAR file for the investigation of the density of states (DOS) of $\ce{Mg2Si}$ so what ...
7
votes
1answer
114 views

How to set different exchange correlational functionals in VASP?

I want to test different exchange correlational functional on Magnesium silicide to investigate the electronic properties. For example, if I have the POTCAR library ...
6
votes
1answer
117 views

VASP error when trying to do calculations in the presence of an electric field

I am trying to observe the effect of the electric field on 2D materials. I applied electric field by introducing three tags: ...