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关 键 词：wien2k代理
行 业：IT 软件 教学管理软件
发布时间：2023-03-24
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The main tasks are:
Define your structure (cif-file import, spacegroup support, symmetry detection)
initialize (semi-automatic guided input generation)
run scf-cycle (with/without simultaneous optimization of atomic positions)
Calculate some properties ("Guided Tasks" in w2web)
write a publication (NOT yet supported in w2web, you must do it yourself)
where ul(r,El) is the (at the origin) regular solution of the radial Schroedinger equation for energy El (chosen normally at the center of the corresponding band with l-like character) and the spherical part of the potential inside sphere t $\dot u_l(r,E_l)$ is the energy derivative of ul taken at the same energy El. A linear combination of these two functions constitute the linearization of the radial function; the coefficients Alm and Blm are functions of kn (see below) determined by requiring that this basis function matches (in value and slope) the corresponding basis function of the interstitial region; $u_l$ and $\dot u_l$ are obtained by numerical integration of the radial Schroedinger equation on a radial mesh inside the sphere.
A description of this method to linearize Slater's old APW method (i.e. the LAPW formalism) and further programming hints are found in many references: Andersen 73, 75, Koelling 72, Koelling and Arbman 75, Wimmer et al. 81, Weinert 81, Weinert et al. 82, Blaha and Schwarz 83, Blaha et al. 85, Wei et al. 85, Mattheiss and Hamann 86, Jansen and Freeman 84, Schwarz and Blaha 96). An excellent book by D. Singh (Singh 94) describes all the details of the LAPW method and is highly recommended to the interested reader. Here only the basic ideas are summarized; details are left to those references.
sequential mode, k-parallel mode (without MPI, slow network with common NFS), massively parallel MPI mode (shared memory or Infiniband)
Energy bands and density of states
electron densities and spin densities, x-ray structure factors, potentials, STM and AFM simulations
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