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from ATK.TwoProbe import *
import ATK
ATK.setVerbosityLevel(2)
# Restore old two-probe configuration
vnl_file = VNLFile("carbon6.vnl"
configurations = vnl_file.readAtomicConfigurations()
ini_two_probe_conf = configurations["carbon6"]
# Create parameters for electrodes
electrode_bz = brillouinZoneIntegrationParameters( (5,5,100) )
electrode_occ = eigenstateOccupationParameters(
temperature = 1300*Kelvin
)
electrode_params = ElectrodeParameters(
eigenstate_occupation_parameters = electrode_occ,
brillouin_zone_integration_parameters = electrode_bz
)
# Collect parameters into a two-probe calculation method
two_probe_method=TwoProbeMethod(
electrode_parameters = (electrode_params, electrode_params),
exchange_correlation_type = LDA.PZ
)
# Define parameters for geometry optimization
opt_params = geometricOptimizationParameters(
force_tolerance = 0.05*eV/Ang,
max_steps = 200
)

# Optimize geometry for the two-probe
opt_two_probe_conf = calculateOptimizedAtomicGeometry(
atomic_configuration = ini_two_probe_conf,
method = two_probe_method,
optimization_parameters = opt_params,
)
# Print and export two-probe configuration to a VNL file
print '\n','='*50,'\n Two-probe optimized configuration:\n','='*50
nlPrint(opt_two_probe_conf)
vnl_file = VNLFile("carbon6opt"
vnl_file.addToSample(opt_two_probe_conf, "carbon6opt

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