# ABINIT TUTORIAL EBOOK

ABINIT is a software suite to calculate the optical, mechanical, vibrational, and other observable properties of materials. Starting from the quantum equations of . The examples in this tutorial will use these shell variables so that one can easily . This is described in the abinit help file, see the input variable prtkpt, and the. >30 tutorial lessons (each hours) 6. ABINIT tutorial: layout + dependencies Jollet, Torrent, Holzwarth, Computer Physics Comm.

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ABINIT, first lesson of the tutorial: The H2 molecule, without convergence studies. This lesson aims at showing how to get the following physical properties. This lesson aims at showing you how to get the following physical properties, for an The file ~ABINIT/Tutorial/adirknesmala.gq lists the file names and root names. Elastic properties / Specific heat / ABINIT Computer program. Abstract. A brief introduction .. Beyond the tutorial, the documentation provided in the package is .

You can find more information about messages in the log file in this section of the abinit help file. Tip If AbiPy is installed on your machine, you can use the abiopen script to extract the messages from the Abinit log file with the syntax: abiopen. Start deforming the primitive vector set.

## ABINIT, first lesson of the tutorial:

Lowest was Likely due to too low boxcut or too low ecut for pseudopotential core charge. Version 8. Starting date : Thu 26 May Goedecker, M. Teter, J.

## Crystalline silicon.

However, this does not influence the results obtained hereafter. However, it is common practice in the scientific literature, to acknowledge the efforts of people that have made the research possible. Note also that it will be of great value to readers of publications presenting these results, to read papers enabling them to understand the theoretical formalism and details of the ABINIT implementation.

Gonze, F. Jollet, F. Abreu Araujo, D. Adams, B. Amadon, T. Applencourt, - C. Audouze, J. Beuken, J. Bieder, A. Bokhanchuk, E. Bousquet, F.

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## ABINIT The user's manual - Université catholique de Louvain

Dorado, C. Espejo, G. Geneste, L. Genovese, A. Gerossier, M. Giantomassi, - Y. Gillet, D. Hamann, L. He, G. Jomard, J. Laflamme Janssen, S. Le Roux, - A. Levitt, A. Lherbier, F. Liu, I. Lukacevic, A. Martin, C. There are dependencies between tutorials. The following schema should help you to understand these dependencies.

## A Tutorial on Density Functional Theory

The blocks in red represents additional tutorials related to ground-state features. Response-function features are explained in the tutorials in the light brown blocks.

Finally, the Many-Body Perturbation Theory capabilities are demonstrated in the tutorials belonging to the dark brown blocks. Powerful visualisation procedures have been developed in the Abipy context, relying on matplotlib. If you have more time, you should browse through the Chaps.

The latter reference is a must if you have not yet used another electronic structure code or a Quantum Chemistry package. The tutorial 1 deals with the H2 molecule: get the total energy, the electronic energies, the charge density, the bond length, the atomisation energy The tutorial 2 deals again with the H2 molecule: convergence studies, LDA versus GGA The tutorial 3 deals with crystalline silicon an insulator : the definition of a k-point grid, the smearing of the cut-off energy, the computation of a band structure, and again, convergence studies … The tutorial 4 deals with crystalline aluminum a metal , and its surface: occupation numbers, smearing the Fermi-Dirac distribution, the surface energy, and again, convergence studies … Other tutorials present more specialized topics.

A band structure can be computed by solving the Kohn-Sham equation for many different k points, along different lines of the Brillouin zone.

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The potential that enters the Kohn-Sham must be derived from a previous self-consistent calculation, and will not vary during the scan of different k-point lines.

Suppose that you want to make a L-Gamma-X- U- Gamma circuit, with 10, 12 and 17 divisions for each line each segment has a different length in reciprocal space, and these divisions give approximately the same distance between points along a line. So, you should set up in your input file, for the first dataset, a usual SCF calculation in which you output the density prtden 1 , and, for the second dataset : fix iscf to -2, to make a non-self-consistent calculation ; define getden -1, to take the output density of dataset 1 ; set nband to 8 ; set kptopt to -3, to define three segments in the brillouin Zone ; set ndivk to 10 12 17 this means a circuit defined by 4 points, with 10 divisions of the first segment, 12 divisions of the second, 17 divisions of the third set kptbounds to 0.

You should set it to 1.

One needs a graphical tool to represent all these data The width of the valence band is The Si is described as an indirect band gap material this is correct , with a band-gap of about 0. The minimum of the conduction band is even slightly diplaced with respect to X, see kpt This underestimation of the band gap is well-known the famous DFT band-gap problem.

This is described in the sixth lesson of the tutorial. For experimental data and band structure representation, see M. Cohen and J. Chelikowski Electronic structure and optical properties of semiconductors Springer-Verlag New-York There is a subtlety that is worth to comment about. Indeed, the two upper bands by default have not been taken into account to apply this convergence criterion: they constitute a "buffer". The number of such "buffer" bands is governed by the input variable nbdbuf.

It can happen that the highest or two highest band s , if not separated by a gap from non-treated bands, can exhibit a very slow convergence rate. This buffer allows to achieve convergence of "important", non-buffer bands.For experimental data and band structure representation, see M. Laflamme Janssen, S. You should first examine the "t Romero, B. Bottin, P.

Beuken, J. Pehlke, and M.

If the code does not stop there, the input parameters are consistent. The H2 molecule would like to expand You can begin to read it.

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