Contents
What is K-point in band structure?
In solid-state theory “k-space” is often used to mean “reciprocal-space” in general, but in electronic-structure theory k-points have a much more specific meaning: they are sampling points in the first Brillouin zone of the material, i.e. the specific region of reciprocal-space which is closest to the origin (0,0,0) ( …
How do you earn K points?
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How do you solve atoms in VASP?
To fix atom positions, you add in the POSCAR “Selective Dynamic” and at the end of each coordinates triplet relative to the atoms you write ” T T T” to let the atom moves along the supercell based vectors or “F F F” to fix the positions.
How is the sampling of kpoints in VASP determined?
In case VASP does not find a KPOINTS file, the k-point sampling is determined by the KSPACING tag in the INCAR file (or by its default value) instead. The most convenient way to specify the k-point sampling of the first Brillouin zone is to have VASP automatically generate a (shifted) regular mesh of points.
How to calculate DFT band structure with k points?
To facilitate the calculation of (DFT) band structure, there is a mode that generates strings of k-points connecting specific points in the Brillouin zone: k-points along high symmetry lines 40 ! 40 intersectons Line-mode reciprocal 0 0 0 ! gamma 0.5 0.5 0 !
How can I reduce the number of k points?
This can reduce the total number of k-points significantly. To enable an efficient symmetry reduction of the automatically generated k-point grids, the (shifted) regular grid of k-points should conserve the point group symmetry of the reciprocal lattice.
How to generate a regular mesh of k points?
Automatic k-mesh generation The most convenient way to specify the k-point sampling of the first Brillouin zone is to have VASP automatically generate a (shifted) regular mesh of points. This mode of k-point generation comes in three different flavours: R k length, Monkhorst-Pack, and generalized regular grids.