hcp0001.cpp

/********************************************************************************
*
*   Copyright (C) 2015 Culham Centre for Fusion Energy,
*   United Kingdom Atomic Energy Authority, Oxfordshire OX14 3DB, UK
*
*   Licensed under the Apache License, Version 2.0 (the "License");
*   you may not use this file except in compliance with the License.
*   You may obtain a copy of the License at
*
*       http://www.apache.org/licenses/LICENSE-2.0
*
*   Unless required by applicable law or agreed to in writing, software
*   distributed under the License is distributed on an "AS IS" BASIS,
*   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
*   See the License for the specific language governing permissions and
*   limitations under the License.
*
********************************************************************************
*
*   Program: SPILADY - A Spin-Lattice Dynamics Simulation Program
*   Version: 1.0
*   Date:    Aug 2015
*   Author:  Pui-Wai (Leo) MA
*   Contact: info@spilady.ccfe.ac.uk
*   Address: Culham Centre for Fusion Energy, OX14 3DB, United Kingdom
*
********************************************************************************/

#include "spilady.h"

#ifdef hcp0001

void hcp0001bulk(){

    nperfect = no_of_unit_cell_x*no_of_unit_cell_y*no_of_unit_cell_z*unit_cell_no_of_atom;
    natom = nperfect;

    box_length.x = double(no_of_unit_cell_x)*unit_cell_edge_x;
    box_length.y = double(no_of_unit_cell_y)*unit_cell_edge_y;
    box_length.z = double(no_of_unit_cell_z)*unit_cell_edge_z;
    box_length_half = vec_times(0.5, box_length);
    d.xx = box_length.x;
    d.yx = 0e0;
    d.yy = box_length.y;
    d.zx = 0e0;
    d.zy = 0e0;
    d.zz = box_length.z;
    Inv_d = inverse_box_vector(d);
    box_volume = vec_volume(box_length);
    density = double(natom)/box_volume;

    first_atom_ptr = (atom_struct*)malloc(natom*sizeof(atom_struct));

    vector dist;
    dist.x=a_lattice;
    dist.y=a_lattice*sqrt(3e0)/2e0;
    dist.z=c_lattice;

    // assign positions of atoms in basic cell      
    first_atom_ptr->r.x = 0e0;
    first_atom_ptr->r.y = 0e0;
    first_atom_ptr->r.z = 0e0;
    (first_atom_ptr+1)->r.x = a_lattice/2e0;
    (first_atom_ptr+1)->r.y = a_lattice/2e0*tan(30e0/180e0*Pi_num);
    (first_atom_ptr+1)->r.z = c_lattice/2e0;

    //replicate first two positions over nunits
    int m = 0;
    int n = 0;
    for (int i = 0; i < no_of_unit_cell_z; ++i ){
        for (int j = 0; j < no_of_unit_cell_y; ++j ){
            for (int k = 0 ; k < no_of_unit_cell_x; ++k ){
                for (int ij = 0 ; ij < 2; ++ij){
                    if (n < nperfect){
                        struct atom_struct *atom_ptr;
                        atom_ptr = first_atom_ptr+ij+m;
                        atom_ptr->r.x = ((first_atom_ptr+ij)->r.x)+dist.x*double(k)+dist.x/2e0*double(j);
                        atom_ptr->r.y = ((first_atom_ptr+ij)->r.y)+dist.y*double(j);
                        atom_ptr->r.z = ((first_atom_ptr+ij)->r.z)+dist.z*double(i);
                    }
                    ++n;
                }
                m += 2;
            }
        }
    }

    for (int i = 0 ; i < nperfect; ++i){
        struct atom_struct *atom_ptr;
        periodic(atom_ptr->r);
        atom_ptr = first_atom_ptr + i;
        atom_ptr->r = vec_add(atom_ptr->r, vec_divide(dist,4e0));
        periodic(atom_ptr->r);
    }
}
#endif