Physics – Condensed Matter – Materials Science
Scientific paper
2001-11-08
J. Phys.: Condens. Matter 14 (2002) 2745-2779
Physics
Condensed Matter
Materials Science
22 pages, 8 figures
Scientific paper
10.1088/0953-8984/14/11/302
We have developed and implemented a self-consistent density functional method using standard norm-conserving pseudopotentials and a flexible, numerical LCAO basis set, which includes multiple-zeta and polarization orbitals. Exchange and correlation are treated with the local spin density or generalized gradient approximations. The basis functions and the electron density are projected on a real-space grid, in order to calculate the Hartree and exchange-correlation potentials and matrix elements, with a number of operations that scales linearly with the size of the system. We use a modified energy functional, whose minimization produces orthogonal wavefunctions and the same energy and density as the Kohn-Sham energy functional, without the need of an explicit orthogonalization. Additionally, using localized Wannier-like electron wavefunctions allows the computation time and memory, required to minimize the energy, to also scale linearly with the size of the system. Forces and stresses are also calculated efficiently and accurately, thus allowing structural relaxation and molecular dynamics simulations.
Artacho Emilio
Gale Julian D.
Garcia Alberto
Junquera Javier
Ordejon Pablo
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