Bandstructure

Table for high symmetry points for brillouin zone. Band structure plot. Next: Density of states plotUp: Plot programs Previous: Hartree potential plot The program gnubnd.run generates plots of the band structure along the symmetry lines defined in the SYML category of the CTRL file.

The program reads the CTRL file, the BNDS file and, if FATBAND=T in the category options in the CTRL file, the file EIGN. The latter two are created by lmbnd.run. It creates the plot data files BNDS.DAT, FERMI.DAT and the command file BNDS.GNU. For an orbital projected bands plot BNDS2-4.DAT are created in addition. After the selection of the output device one is prompted for a 40-character title string for the plot: enter title: followed by the definition of the energy unit: energies in Ryd. Entering t (logical true) selects electron volts, whereas f (logical false) or / selects Rydberg. Energies relative to EF (t)? Depending on the choice of symmetry lines and energy range it may be advantageous to plot the band structure in portrait mode instead of the default landscape mode: .

Band structure computing. Are you looking at the abinit tutorials?

These points are generally special points of high symmetry in the first Brillouin zone (FBZ). These are almost always on the surfaces of the FBZ, usually in the center of faces, at corners or centers of edges. There's a picture of the first Brillouin zone for an fcc lattice here, with the special point marked: X is in the center of the square face, L is in the center of the hexagonal face, and U is in the center of the edge that connects those two faces. These points are different for each reciprocal zone (for instance, a hexagonal crystal does not have an X special point). K-space high symmetry points - exciting. Hello all.

I have a quick question regarding the location of high symmetry points in reciprocal space and the co-ordinates you input into input.xml. I've had a look at the Al example that comes with the exciting source code. I see that the following high symmetry points are defined in the input file: but I cannot seem to tally these co-ordinates with those in the Brillouin zone. The gamma point is at the centre of the zone and is being taken as the origin, but I'm having difficulty in figuring out why the other points have their specified locations.

I have tried to determine the band structure of my material (MnSb) which is a hexagonal crystal but the points that I have used do not seem to be high symmetry points and, frankly, the plotted band structure is a mess! I calculated these co-ordinates with James Annett during last year's Psi-k DFT workshop held at Bristol University. Kind regards, James. Band-structure analysis. How to calculate the band structure? How do Gamma point phonons work? [Archive] - Physics Forums. I think a quick recap of what a phonon wave-vector is may be useful.

If the following is trivially basic, it is because I'm not sure what your level of reading and understanding of this area is, mostly since you are from another area. Let's look at different vibrational modes in a 1D lattice (along the x-direction) of basis 1 (meaning there's only one type of atom in the lattice) and lattice parameter d (where o is a real space lattice point, and the arrows represent the amplitude and direction of displacement of the lattice points from their equilibrium positions, at some specific point in time): o---> o--> o-> o <-o <--o <---o <--o <-o o o-> o--> o---> This mode has a wavelength, \lambda= 12d , making the magnitude of its wave-vector (i.e., its wavenumber), k=2\pi/\lambda = \pi/6d .

Furthermore, we can see that this is a longitudinal mode as the displacements are along the same direction as the propagation (i.e., the x-direction).