def asesurf2xxyz(symb, lattice, index, size=(1,1,3), vac=15.0, orthogonal=0):
"""
An interface function for ase.lattice.surface
Usage:
>>> atoms = asesurf2xxyz(symb, lattice, index, size,
vac=15.0, orthogonal=0))
Parameters:
symb: atomic symbol
lattice: 'fcc', 'bcc', or 'hcp0001'
index: '100', '111' or '110' (if lattice is 'hcp0001', this will not work.)
size: the number of atoms per each vector
Optional Parameters:
vac (default: 15.0 angstron): the thickness of space normal to the surface
orthogonal (default: False) : if True, two lateral cell vectors will be
orthogonal.
Example:
>>> Fe_100_1x1 = asesurf2xxyz('Fe', 'bcc', '100', (1,1,2))
>>> Au_111_2x2 = asesurf2xxyz('Au', 'fcc', '111', (1,1,3))
"""
if lattice == 'fcc':
if index == '100': at_ase = AS.fcc100(symb, size, vacuum=vac)
elif index == '111': at_ase = AS.fcc111(symb, size,
orthogonal=orthogonal,
vacuum=vac)
elif index == '110': at_ase = AS.fcc110(symb, size, vacuum=vac)
else: raise ValueError("100, 111, or 110 surface is supported.")
elif lattice == 'bcc':
if index == '100': at_ase = AS.bcc100(symb, size, vacuum=vac)
elif index == '111': at_ase = AS.bcc111(symb, size,
orthogonal=orthogonal,
vacuum=vac)
elif index == '110': at_ase = AS.bcc110(symb, size,
orthogonal=orthogonal,
vacuum=vac)
else: raise ValueError("100, 111, or 110 surface is supported.")
elif lattice == 'hcp0001':
at_ase = AS.hcp0001(symb, size, orthogonal=orthogonal, vacuum=vac)
else: raise ValueError("fcc, bcc, or hcp0001 surface is supported.")
symbols = at_ase.get_chemical_symbols()
posits = at_ase.get_positions()
cell = at_ase.get_cell()
pbc = at_ase.get_pbc()
atoms = []; i=0
for sym in symbols:
temp_at = Atom(sym, list(posits[i]))
atoms.append(temp_at.copy()); i+=1
at_xxyz = AtomsSystem(atoms, cell=cell, pbc=pbc)
return at_xxyz
def asesurf2xxyz(symb, lattice, index, size=(1,1,3), vac=15.0, orthogonal=0):
"""
An interface function for ase.lattice.surface
Usage:
>>> atoms = asesurf2xxyz(symb, lattice, index, size,
vac=15.0, orthogonal=0))
Parameters:
symb: atomic symbol
lattice: 'fcc', 'bcc', or 'hcp0001'
index: '100', '111' or '110' (if lattice is 'hcp0001', this will not work.)
size: the number of atoms per each vector
Optional Parameters:
vac (default: 15.0 angstron): the thickness of space normal to the surface
orthogonal (default: False) : if True, two lateral cell vectors will be
orthogonal.
Example:
>>> Fe_100_1x1 = asesurf2xxyz('Fe', 'bcc', '100', (1,1,2))
>>> Au_111_2x2 = asesurf2xxyz('Au', 'fcc', '111', (1,1,3))
"""
if lattice == 'fcc':
if index == '100': at_ase = AS.fcc100(symb, size, vacuum=vac)
elif index == '111': at_ase = AS.fcc111(symb, size,
orthogonal=orthogonal,
vacuum=vac)
elif index == '110': at_ase = AS.fcc110(symb, size, vacuum=vac)
else: raise ValueError, "100, 111, or 110 surface is supported."
elif lattice == 'bcc':
if index == '100': at_ase = AS.bcc100(symb, size, vacuum=vac)
elif index == '111': at_ase = AS.bcc111(symb, size,
orthogonal=orthogonal,
vacuum=vac)
elif index == '110': at_ase = AS.bcc110(symb, size,
orthogonal=orthogonal,
vacuum=vac)
else: raise ValueError, "100, 111, or 110 surface is supported."
elif lattice == 'hcp0001':
at_ase = AS.hcp0001(symb, size, orthogonal=orthogonal, vacuum=vac)
else: raise ValueError, "fcc, bcc, or hcp0001 surface is supported."
symbols = at_ase.get_chemical_symbols()
posits = at_ase.get_positions()
cell = at_ase.get_cell()
pbc = at_ase.get_pbc()
atoms = []; i=0
for sym in symbols:
temp_at = Atom(sym, list(posits[i]))
atoms.append(temp_at.copy()); i+=1
at_xxyz = AtomsSystem(atoms, cell=cell, pbc=pbc)
return at_xxyz
def test():
# Generate atomic system to create test data.
atoms = fcc110('Cu', (2, 2, 2), vacuum=7.)
adsorbate = Atoms([
Atom('H', atoms[7].position + (0., 0., 2.)),
Atom('H', atoms[7].position + (0., 0., 5.))
])
atoms.extend(adsorbate)
atoms.set_constraint(FixAtoms(indices=[0, 2]))
calc = EMT() # cheap calculator
atoms.set_calculator(calc)
# Run some molecular dynamics to generate data.
trajectory = io.Trajectory('data.traj', 'w', atoms=atoms)
MaxwellBoltzmannDistribution(atoms, temp=300. * units.kB)
dynamics = VelocityVerlet(atoms, dt=1. * units.fs)
dynamics.attach(trajectory)
for step in range(50):
dynamics.run(5)
trajectory.close()
# Train the calculator.
train_images, test_images = randomize_images('data.traj')
calc = Amp(descriptor=Behler(), regression=NeuralNetwork())
calc.train(train_images, energy_goal=0.001, force_goal=None)
# Plot and test the predictions.
import matplotlib
matplotlib.use('Agg')
from matplotlib import pyplot
fig, ax = pyplot.subplots()
for image in train_images:
actual_energy = image.get_potential_energy()
predicted_energy = calc.get_potential_energy(image)
ax.plot(actual_energy, predicted_energy, 'b.')
for image in test_images:
actual_energy = image.get_potential_energy()
predicted_energy = calc.get_potential_energy(image)
ax.plot(actual_energy, predicted_energy, 'r.')
ax.set_xlabel('Actual energy, eV')
ax.set_ylabel('Amp energy, eV')
fig.savefig('parityplot.png')
def test():
# Generate atomic system to create test data.
atoms = fcc110('Cu', (2, 2, 2), vacuum=7.)
adsorbate = Atoms([Atom('H', atoms[7].position + (0., 0., 2.)),
Atom('H', atoms[7].position + (0., 0., 5.))])
atoms.extend(adsorbate)
atoms.set_constraint(FixAtoms(indices=[0, 2]))
calc = EMT() # cheap calculator
atoms.set_calculator(calc)
# Run some molecular dynamics to generate data.
trajectory = io.Trajectory('data.traj', 'w', atoms=atoms)
MaxwellBoltzmannDistribution(atoms, temp=300. * units.kB)
dynamics = VelocityVerlet(atoms, dt=1. * units.fs)
dynamics.attach(trajectory)
for step in range(50):
dynamics.run(5)
trajectory.close()
# Train the calculator.
train_images, test_images = randomize_images('data.traj')
calc = Amp(descriptor=Behler(),
regression=NeuralNetwork())
calc.train(train_images, energy_goal=0.001, force_goal=None)
# Plot and test the predictions.
import matplotlib
matplotlib.use('Agg')
from matplotlib import pyplot
fig, ax = pyplot.subplots()
for image in train_images:
actual_energy = image.get_potential_energy()
predicted_energy = calc.get_potential_energy(image)
ax.plot(actual_energy, predicted_energy, 'b.')
for image in test_images:
actual_energy = image.get_potential_energy()
predicted_energy = calc.get_potential_energy(image)
ax.plot(actual_energy, predicted_energy, 'r.')
ax.set_xlabel('Actual energy, eV')
ax.set_ylabel('Amp energy, eV')
fig.savefig('parityplot.png')
def generate_data(count):
"""Generates test or training data with a simple MD simulation."""
atoms = fcc110('Pt', (2, 2, 1), vacuum=7.)
adsorbate = Atoms([Atom('Cu', atoms[3].position + (0., 0., 2.5)),
Atom('Cu', atoms[3].position + (0., 0., 5.))])
atoms.extend(adsorbate)
atoms.set_constraint(FixAtoms(indices=[0, 2]))
atoms.set_calculator(EMT())
MaxwellBoltzmannDistribution(atoms, 300. * units.kB)
dyn = VelocityVerlet(atoms, dt=1. * units.fs)
newatoms = atoms.copy()
newatoms.set_calculator(EMT())
newatoms.get_potential_energy()
images = [newatoms]
for step in range(count - 1):
dyn.run(50)
newatoms = atoms.copy()
newatoms.set_calculator(EMT())
newatoms.get_potential_energy()
images.append(newatoms)
return images
def generate_data(count):
"""Generates test or training data with a simple MD simulation."""
atoms = fcc110('Pt', (2, 2, 2), vacuum=7.)
adsorbate = Atoms([
Atom('Cu', atoms[7].position + (0., 0., 2.5)),
Atom('Cu', atoms[7].position + (0., 0., 5.))
])
atoms.extend(adsorbate)
atoms.set_constraint(FixAtoms(indices=[0, 2]))
atoms.set_calculator(EMT())
MaxwellBoltzmannDistribution(atoms, 300. * units.kB)
dyn = VelocityVerlet(atoms, dt=1. * units.fs)
newatoms = atoms.copy()
newatoms.set_calculator(EMT())
newatoms.get_potential_energy(apply_constraint=False)
images = [newatoms]
for step in range(count):
dyn.run(5)
newatoms = atoms.copy()
newatoms.set_calculator(EMT())
newatoms.get_potential_energy(apply_constraint=False)
images.append(newatoms)
return images
from vasp import Vasp
from ase.lattice.surface import fcc110
from ase.io import write
from ase.constraints import FixAtoms
atoms = fcc110('Au', size=(2, 1, 6), vacuum=10.0)
constraint = FixAtoms(mask=[atom.tag > 2 for atom in atoms])
atoms.set_constraint(constraint)
write('images/Au-110.png',
atoms.repeat((2, 2, 1)),
rotation='-90x',
show_unit_cell=2)
print Vasp('surfaces/Au-110',
xc='PBE',
kpts=[6, 6, 1],
encut=350,
ibrion=2,
isif=2,
nsw=10,
atoms=atoms).potential_energy
from ase import Atoms, Atom
from ase.lattice.surface import fcc110
from ase.optimize.minimahopping import MinimaHopping
from ase.calculators.emt import EMT
from ase.constraints import FixAtoms, Hookean
# Make the Pt 110 slab.
atoms = fcc110('Pt', (2, 2, 2), vacuum=7.)
# Add the Cu2 adsorbate.
adsorbate = Atoms([Atom('Cu', atoms[7].position + (0., 0., 2.5)),
Atom('Cu', atoms[7].position + (0., 0., 5.0))])
atoms.extend(adsorbate)
# Constrain the surface to be fixed and a Hookean constraint between
# the adsorbate atoms.
constraints = [FixAtoms(indices=[atom.index for atom in atoms if
atom.symbol == 'Pt']),
Hookean(a1=8, a2=9, rt=2.6, k=15.),
Hookean(a1=8, a2=(0., 0., 1., -15.), k=15.)]
atoms.set_constraint(constraints)
# Set the calculator.
calc = EMT()
atoms.set_calculator(calc)
# Instantiate and run the minima hopping algorithm.
hop = MinimaHopping(atoms,
Ediff0=2.5,
T0=2000.)
hop(totalsteps=3)
from jasp import *
from ase.lattice.surface import fcc110
from ase.io import write
from ase.constraints import FixAtoms
atoms = fcc110('Au', size=(2, 1, 6), vacuum=10.0)
del atoms[11] # delete surface row
constraint = FixAtoms(mask=[atom.tag > 2 for atom in atoms])
atoms.set_constraint(constraint)
write('images/Au-110-missing-row.png',
atoms.repeat((2, 2, 1)),
rotation='-90x',
show_unit_cell=2)
with jasp('surfaces/Au-110-missing-row',
xc='PBE',
kpts=(6, 6, 1),
encut=350,
ibrion=2,
isif=2,
nsw=10,
atoms=atoms) as calc:
calc.calculate()
from ase import Atoms, Atom
from ase.lattice.surface import fcc110
from ase.optimize.minimahopping import MinimaHopping
from ase.calculators.emt import EMT
from ase.constraints import FixAtoms, Hookean
from ase.optimize import BFGS
# Make the Pt 110 slab.
atoms = fcc110('Pt', (2, 2, 2), vacuum=7.)
# Add the Cu2 adsorbate.
adsorbate = Atoms([
Atom('Cu', atoms[7].position + (0., 0., 2.5)),
Atom('Cu', atoms[7].position + (0., 0., 5.0))
])
atoms.extend(adsorbate)
# Constrain the surface to be fixed and a Hookean constraint between
# the adsorbate atoms.
constraints = [
FixAtoms(indices=[atom.index for atom in atoms if atom.symbol == 'Pt']),
Hookean(a1=8, a2=9, rt=2.6, k=15.),
Hookean(a1=8, a2=(0., 0., 1., -15.), k=15.),
]
atoms.set_constraint(constraints)
# Set the calculator.
calc = EMT()
atoms.set_calculator(calc)
# Instantiate and run the minima hopping algorithm.
# The vasp path should be set in the shell terminal.
import sys
sys.path.append('/export/zimmerman/paulzim/ase')
from math import sqrt
import os, fnmatch
from ase import Atoms
import io
from ase.io import read
from subprocess import call
from ase.calculators.vasp import Vasp
from ase.calculators.emt import EMT
from ase.lattice.surface import fcc110, add_adsorbate
slab = fcc110('Cu', size=(3,3,4), vacuum=10)
molecule = Atoms('OHH')
add_adsorbate(slab, molecule, 1.7, 'ontop')
path = os.getcwd()
FH = open('finalForces', 'a')
for file in sorted(os.listdir(path)):
if fnmatch.fnmatch(file, '*.xyz'):
fName = file
slabatoms = read(fName)
slab.set_positions(slabatoms.get_positions())
# calc = Vasp(xc='PBE',lreal='Auto',kpts=[1,1,1],ismear=1,sigma=0.2,algo='fast',istart=0,npar=8,encut=300)
# calc = EMT()
slab.set_calculator(calc)
f = slab.get_forces()
# The vasp path should be set in the shell terminal.
import sys
sys.path.append('/export/zimmerman/paulzim/ase')
from math import sqrt
import os, fnmatch
from ase import Atoms
import io
from ase.io import read
from subprocess import call
from ase.calculators.vasp import Vasp
from ase.calculators.emt import EMT
from ase.lattice.surface import fcc110, add_adsorbate
slab = fcc110('Cu', size=(3, 3, 4), vacuum=10)
molecule = Atoms('OHH')
add_adsorbate(slab, molecule, 1.7, 'ontop')
path = os.getcwd()
FH = open('finalForces', 'a')
for file in sorted(os.listdir(path)):
if fnmatch.fnmatch(file, '*.xyz'):
fName = file
slabatoms = read(fName)
slab.set_positions(slabatoms.get_positions())
# calc = Vasp(xc='PBE',lreal='Auto',kpts=[1,1,1],ismear=1,sigma=0.2,algo='fast',istart=0,npar=8,encut=300)
# calc = EMT()
slab.set_calculator(calc)
f = slab.get_forces()
from ase import Atoms
from ase.lattice import surface
from ase.constraints import FixAtoms
from ase.calculators.vasp import Vasp
from ase.visualize import view
from ase.io import write
from ase.io import read
calc = Vasp(xc='PBE', kpts=(3,3,1), nwrite=1, lwave=False, lcharg=False,lvtot=False
, encut=400, algo='Fast', ismear=1, sigma=0.1, voskown=1, istart=0, nelm=400, nelmdl=-10, ediff=1e-6, ispin=1
,nsw=1000, isif=2, ibrion=2, nfree=2, potim=0.2, ediffg=-0.04
,npar=2, lvdw=True, vdw_version=3
,lreal='Auto')
# Create a 4X4 surface with 4 layers and 14 Angstrom of vacuum
CONTCAR = read('CONTCAR')
slab = surface.fcc110('Ag', size=(4,4,4), a=4.07,vacuum=20.0)
#slab.positions=CONTCAR.positions
adsorbate = surface.Atoms('N')
surface.add_adsorbate(slab, adsorbate, 1.20, 'longbridge')
slab.center(vacuum=20.0,axis=2)
#freeze all layers below top two layers
mask = [atom.tag > 2 for atom in slab]
slab.set_constraint(FixAtoms(mask=mask))
#write_vasp('POSCAR', slab, long_format=True, vasp5=True)
view(slab) # View the slab, frozen atoms will be marked with a "X"
def initlatticepositions(params, nlayers):
"""
Return nlayers of positions according to lattice type/plane and
shift positions so that no atoms are on the edges of the box.
"""
lxsurf = params['lxsurf']
lysurf = params['lysurf']
alat = params['alat']
if params['surftype'] == 'fcc':
if params['plane'] == '111':
surf = ase.fcc111('O',
a=alat,
size=(lxsurf, lysurf, nlayers),
orthogonal=True)
positions = surf.positions
positions[:, 0] = positions[:, 0] + (alat / 2.0**0.5) / 4.0
positions[:, 1] = (positions[:, 1] + (1.0 / 2.0) * (3.0**0.5) *
(alat / 2.0**0.5) / 4.0)
elif params['plane'] == '100':
surf = ase.fcc100('O', a=alat, size=(lxsurf, lysurf, nlayers))
positions = surf.positions
positions[:, 0] = positions[:, 0] + (alat / 2.0**0.5) / 4.0
positions[:, 1] = positions[:, 1] + (alat / 2.0**0.5) / 4.0
elif params['plane'] == '110':
surf = ase.fcc110('O', a=alat, size=(lxsurf, lysurf, nlayers))
positions = surf.positions
positions[:, 0] = positions[:, 0] + alat / 4.0
positions[:, 1] = positions[:, 1] + (alat / 2.0**0.5) / 4.0
elif params['surftype'] == 'bcc':
if params['plane'] == '100':
surf = ase.bcc100('O', a=alat, size=(lxsurf, lysurf, nlayers))
positions = surf.positions
positions[:, 0] = positions[:, 0] + alat / 2.0
positions[:, 1] = positions[:, 1] + alat / 2.0
elif params['surftype'] == 'hcp':
clat = params['clat']
if params['plane'] == '0001':
surf = ase.hcp0001('O',
a=alat,
c=clat,
size=(lxsurf, lysurf, nlayers),
orthogonal=True)
positions = surf.positions
positions[:, 0] = positions[:, 0] + alat / 4.0
positions[:,
1] = positions[:,
1] + (1.0 / 2.0) * (3.0**0.5) * alat / 4.0
elif params['plane'] == '1010':
surf = ase.hcp10m10('O',
a=alat,
c=clat,
size=(lxsurf, lysurf, nlayers))
positions = surf.positions
positions[:, 0] = positions[:, 0] + alat / 4.0
positions[:, 1] = positions[:, 1] + clat / 4.0
return positions
parser.print_help()
sys.exit()
l=options.lattice
p=options.periods
v=options.vaccuum
e=options.element
atoms = []
if(options.bravais == 'fcc'):
if(options.hkl == '111'):
#atoms = fcc111(e, size=p,a=l, vacuum=v, orthogonal=False)
atoms = fcc111(e, size=p,a=l, vacuum=v, orthogonal=options.ortogonal)
elif(options.hkl == '110'):
atoms = fcc110(e, size=p,a=l, vacuum=v)
elif(options.hkl == '100'):
atoms = fcc100(e, size=p,a=l, vacuum=v)
elif(options.bravais == 'MoS2'):
atoms = mx2(formula='MoS2', kind='2H', a=3.18, thickness=3.19, size=(1, 1, 1), vacuum=7.5)
#c=atoms.get_cell()
#c[1][0] += l*math.sqrt(2)*0.5
#atoms.set_cell(c)
#atoms.translate([0.0,0.0,-14.9999999999999982])
if(options.cell != None):
to_remove = []
for i, atom in enumerate(atoms):
r = atom.position.astype(float)
