lammps/examples/USER/atc/elastic/CNT_electrostatic.mat

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material CNT metal
stress linear
modulus 0.00025
possions_ratio 0.25
end
electric_field linear
permittivity 1.0
end
##electron_density identity
##end
mass_density
#electron_density exponential
# intrinsic_concentration 0.0001
# intrinsic_energy 1.0
# reference_temperature 300
#end
body_force
end