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vasp_raman.py
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#!/usr/bin/env python
#
# vasp_raman.py v. 0.6.0
#
# Raman off-resonant activity calculator
# using VASP as a back-end.
#
# Contributors: Alexandr Fonari (Georgia Tech)
# Shannon Stauffer (UT Austin)
#
# URL: http://raman-sc.github.io
#
# MIT license, 2013, 2014
#
def MAT_m_VEC(m, v):
p = [ 0.0 for i in range(len(v)) ]
for i in range(len(m)):
assert len(v) == len(m[i]), 'Length of the matrix row is not equal to the length of the vector'
p[i] = sum( [ m[i][j]*v[j] for j in range(len(v)) ] )
return p
#
def T(m):
p = [[ m[i][j] for i in range(len( m[j] )) ] for j in range(len( m )) ]
return p
#
# modified subroutine from phonopy 1.8.3 (New BSD license)
def parse_poscar(poscar_fh):
import sys
poscar_fh.seek(0) # just in case
lines = poscar_fh.readlines()
#
scale = float(lines[1])
if scale < 0.0:
print "[parse_poscar]: ERROR negative scale not implemented."
sys.exit(1)
#
b = []
for i in range(2, 5):
b.append([float(x)*scale for x in lines[i].split()[:3]])
#
vol = b[0][0]*b[1][1]*b[2][2] + b[1][0]*b[2][1]*b[0][2] + b[2][0]*b[0][1]*b[1][2] - \
b[0][2]*b[1][1]*b[2][0] - b[2][1]*b[1][2]*b[0][0] - b[2][2]*b[0][1]*b[1][0]
#
try:
num_atoms = [int(x) for x in lines[5].split()]
line_at = 6
except ValueError:
symbols = [x for x in lines[5].split()]
num_atoms = [int(x) for x in lines[6].split()]
line_at = 7
nat = sum(num_atoms)
#
if lines[line_at][0].lower() == 's':
line_at += 1
#
is_scaled = True
if (lines[line_at][0].lower() == 'c' or
lines[line_at][0].lower() == 'k'):
is_scaled = False
#
line_at += 1
#
positions = []
for i in range(line_at, line_at + nat):
pos = [float(x) for x in lines[i].split()[:3]]
#
if is_scaled:
pos = MAT_m_VEC(T(b), pos)
#
positions.append(pos)
#
poscar_header = ''.join(lines[1:line_at-1]) # will add title and 'Cartesian' later
return nat, vol, b, positions, poscar_header
#
def parse_env_params(params):
import sys
#
tmp = params.strip().split('_')
if len(tmp) != 4:
print "[parse_env_params]: ERROR there should be exactly four parameters"
sys.exit(1)
#
[first, last, nderiv, step_size] = [int(tmp[0]), int(tmp[1]), int(tmp[2]), float(tmp[3])]
#
return first, last, nderiv, step_size
#
#### subs for the output from VTST tools
def parse_freqdat(freqdat_fh, nat):
freqdat_fh.seek(0) # just in case
#
eigvals = [ 0.0 for i in range(nat*3) ]
#
for i in range(nat*3): # all frequencies should be supplied, regardless of requested to calculate
tmp = freqdat_fh.readline().split()
eigvals[i] = float(tmp[0])
#
return eigvals
#
def parse_modesdat(modesdat_fh, nat):
from math import sqrt
modesdat_fh.seek(0) # just in case
#
eigvecs = [ 0.0 for i in range(nat*3) ]
norms = [ 0.0 for i in range(nat*3) ]
#
for i in range(nat*3): # all frequencies should be supplied, regardless of requested to calculate
eigvec = []
for j in range(nat):
tmp = modesdat_fh.readline().split()
eigvec.append([ float(tmp[x]) for x in range(3) ])
#
modesdat_fh.readline().split() # empty line
eigvecs[i] = eigvec
norms[i] = sqrt( sum( [abs(x)**2 for sublist in eigvec for x in sublist] ) )
#
return eigvecs, norms
#### end subs for VTST
#
def get_modes_from_OUTCAR(outcar_fh, nat):
import sys
import re
from math import sqrt
eigvals = [ 0.0 for i in range(nat*3) ]
eigvecs = [ 0.0 for i in range(nat*3) ]
norms = [ 0.0 for i in range(nat*3) ]
#
outcar_fh.seek(0) # just in case
while True:
line = outcar_fh.readline()
if not line:
break
#
if "Eigenvectors after division by SQRT(mass)" in line:
outcar_fh.readline() # empty line
outcar_fh.readline() # Eigenvectors and eigenvalues of the dynamical matrix
outcar_fh.readline() # ----------------------------------------------------
outcar_fh.readline() # empty line
#
for i in range(nat*3): # all frequencies should be supplied, regardless of those requested to calculate
outcar_fh.readline() # empty line
p = re.search(r'^\s*(\d+).+?([\.\d]+) cm-1', outcar_fh.readline())
eigvals[i] = float(p.group(2))
#
outcar_fh.readline() # X Y Z dx dy dz
eigvec = []
#
for j in range(nat):
tmp = outcar_fh.readline().split()
#
eigvec.append([ float(tmp[x]) for x in range(3,6) ])
#
eigvecs[i] = eigvec
norms[i] = sqrt( sum( [abs(x)**2 for sublist in eigvec for x in sublist] ) )
#
return eigvals, eigvecs, norms
#
print "[get_modes_from_OUTCAR]: ERROR Couldn't find 'Eigenvectors after division by SQRT(mass)' in OUTCAR. Use 'NWRITE=3' in INCAR. Exiting..."
sys.exit(1)
#
def get_epsilon_from_OUTCAR(outcar_fh):
import re
import sys
epsilon = []
#
outcar_fh.seek(0) # just in case
while True:
line = outcar_fh.readline()
if not line:
break
#
if "MACROSCOPIC STATIC DIELECTRIC TENSOR" in line:
outcar_fh.readline()
epsilon.append([float(x) for x in outcar_fh.readline().split()])
epsilon.append([float(x) for x in outcar_fh.readline().split()])
epsilon.append([float(x) for x in outcar_fh.readline().split()])
return epsilon
#
raise RuntimeError("[get_epsilon_from_OUTCAR]: ERROR Couldn't find dielectric tensor in OUTCAR")
return 1
#
if __name__ == '__main__':
import sys
from math import pi
from shutil import move
import os
import datetime
import time
#import argparse
import optparse
#
print ""
print " Raman off-resonant activity calculator,"
print " using VASP as a back-end."
print ""
print " Contributors: Alexandr Fonari (Georgia Tech)"
print " Shannon Stauffer (UT Austin)"
print " MIT License, 2013"
print " URL: http://raman-sc.github.io"
print " Started at: "+datetime.datetime.now().strftime("%Y-%m-%d %H:%M")
print ""
#
description = "Before run, set environment variables:\n"
description += " VASP_RAMAN_RUN='mpirun vasp'\n"
description += " VASP_RAMAN_PARAMS='[first-mode]_[last-mode]_[nderiv]_[step-size]'\n\n"
description += "bash one-liner is:\n"
description += "VASP_RAMAN_RUN='mpirun vasp' VASP_RAMAN_PARAMS='1_2_2_0.01' python vasp_raman.py"
#
parser = optparse.OptionParser(description=description)
parser.add_option('-g', '--gen', help='Generate POSCAR only', action='store_true')
parser.add_option('-u', '--use_poscar', help='Use provided POSCAR in the folder, USE WITH CAUTION!!', action='store_true')
(options, args) = parser.parse_args()
#args = vars(parser.parse_args())
args = vars(options)
#
VASP_RAMAN_RUN = os.environ.get('VASP_RAMAN_RUN')
if VASP_RAMAN_RUN == None:
print "[__main__]: ERROR Set environment variable 'VASP_RAMAN_RUN'"
print ""
parser.print_help()
sys.exit(1)
print "[__main__]: VASP_RAMAN_RUN='"+VASP_RAMAN_RUN+"'"
#
VASP_RAMAN_PARAMS = os.environ.get('VASP_RAMAN_PARAMS')
if VASP_RAMAN_PARAMS == None:
print "[__main__]: ERROR Set environment variable 'VASP_RAMAN_PARAMS'"
print ""
parser.print_help()
sys.exit(1)
print "[__main__]: VASP_RAMAN_PARAMS='"+VASP_RAMAN_PARAMS+"'"
#
first, last, nderiv, step_size = parse_env_params(VASP_RAMAN_PARAMS)
assert first >= 1, '[__main__]: First mode should be equal or larger than 1'
assert last >= first, '[__main__]: Last mode should be equal or larger than first mode'
if args['gen']: assert last == first, "[__main__]: '-gen' mode -> only generation for the one mode makes sense"
assert nderiv == 2, '[__main__]: At this time, nderiv = 2 is the only supported'
disps = [-1, 1] # hardcoded for
coeffs = [-0.5, 0.5] # three point stencil (nderiv=2)
#
try:
poscar_fh = open('POSCAR.phon', 'r')
except IOError:
print "[__main__]: ERROR Couldn't open input file POSCAR.phon, exiting...\n"
sys.exit(1)
#
# nat, vol, b, poscar_header = parse_poscar_header(poscar_fh)
nat, vol, b, pos, poscar_header = parse_poscar(poscar_fh)
print pos
#print poscar_header
#sys.exit(0)
#
# either use modes from vtst tools or VASP
if os.path.isfile('freq.dat') and os.path.isfile('modes_sqrt_amu.dat'):
try:
freqdat_fh = open('freq.dat', 'r')
except IOError:
print "[__main__]: ERROR Couldn't open freq.dat, exiting...\n"
sys.exit(1)
#
eigvals = parse_freqdat(freqdat_fh, nat)
freqdat_fh.close()
#
try:
modes_fh = open('modes_sqrt_amu.dat' , 'r')
except IOError:
print "[__main__]: ERROR Couldn't open modes_sqrt_amu.dat, exiting...\n"
sys.exit(1)
#
eigvecs, norms = parse_modesdat(modes_fh, nat)
modes_fh.close()
#
elif os.path.isfile('OUTCAR.phon'):
try:
outcar_fh = open('OUTCAR.phon', 'r')
except IOError:
print "[__main__]: ERROR Couldn't open OUTCAR.phon, exiting...\n"
sys.exit(1)
#
eigvals, eigvecs, norms = get_modes_from_OUTCAR(outcar_fh, nat)
outcar_fh.close()
#
else:
print "[__main__]: Neither OUTCAR.phon nor freq.dat/modes_sqrt_amu.dat were found, nothing to do, exiting..."
sys.exit(1)
#
output_fh = open('vasp_raman.dat', 'w')
output_fh.write("# mode freq(cm-1) alpha beta2 activity\n")
for i in range(first-1, last):
eigval = eigvals[i]
eigvec = eigvecs[i]
norm = norms[i]
#
print ""
print "[__main__]: Mode #%i: frequency %10.7f cm-1; norm: %10.7f" % ( i+1, eigval, norm )
#
ra = [[0.0 for x in range(3)] for y in range(3)]
for j in range(len(disps)):
disp_filename = 'OUTCAR.%04d.%+d.out' % (i+1, disps[j])
#
try:
outcar_fh = open(disp_filename, 'r')
print "[__main__]: File "+disp_filename+" exists, parsing..."
except IOError:
if args['use_poscar'] != True:
print "[__main__]: File "+disp_filename+" not found, preparing displaced POSCAR"
poscar_fh = open('POSCAR', 'w')
poscar_fh.write("%s %4.1e \n" % (disp_filename, step_size))
poscar_fh.write(poscar_header)
poscar_fh.write("Cartesian\n")
#
for k in range(nat):
pos_disp = [ pos[k][l] + eigvec[k][l]*step_size*disps[j]/norm for l in range(3)]
poscar_fh.write( '%15.10f %15.10f %15.10f\n' % (pos_disp[0], pos_disp[1], pos_disp[2]) )
#print '%10.6f %10.6f %10.6f %10.6f %10.6f %10.6f' % (pos[k][0], pos[k][1], pos[k][2], dis[k][0], dis[k][1], dis[k][2])
poscar_fh.close()
else:
print "[__main__]: Using provided POSCAR"
#
if args['gen']: # only generate POSCARs
poscar_fn = 'POSCAR.%+d.out' % disps[j]
move('POSCAR', poscar_fn)
print "[__main__]: '-gen' mode -> "+poscar_fn+" with displaced atoms have been generated"
#
if j+1 == len(disps): # last iteration for the current displacements list
print "[__main__]: '-gen' mode -> POSCAR files with displaced atoms have been generated, exiting now"
sys.exit(0)
else: # run VASP here
print "[__main__]: Running VASP..."
os.system(VASP_RAMAN_RUN)
try:
move('OUTCAR', disp_filename)
except IOError:
print "[__main__]: ERROR Couldn't find OUTCAR file, exiting..."
sys.exit(1)
#
outcar_fh = open(disp_filename, 'r')
#
try:
eps = get_epsilon_from_OUTCAR(outcar_fh)
outcar_fh.close()
except Exception, err:
print err
print "[__main__]: Moving "+disp_filename+" back to 'OUTCAR' and exiting..."
move(disp_filename, 'OUTCAR')
sys.exit(1)
#
for m in range(3):
for n in range(3):
ra[m][n] += eps[m][n] * coeffs[j]/step_size * norm * vol/(4.0*pi)
#units: A^2/amu^1/2 = dimless * 1/A * 1/amu^1/2 * A^3
#
alpha = (ra[0][0] + ra[1][1] + ra[2][2])/3.0
beta2 = ( (ra[0][0] - ra[1][1])**2 + (ra[0][0] - ra[2][2])**2 + (ra[1][1] - ra[2][2])**2 + 6.0 * (ra[0][1]**2 + ra[0][2]**2 + ra[1][2]**2) )/2.0
print ""
print "! %4i freq: %10.5f alpha: %10.7f beta2: %10.7f activity: %10.7f " % (i+1, eigval, alpha, beta2, 45.0*alpha**2 + 7.0*beta2)
output_fh.write("%03i %10.5f %10.7f %10.7f %10.7f\n" % (i+1, eigval, alpha, beta2, 45.0*alpha**2 + 7.0*beta2))
output_fh.flush()
#
output_fh.close()