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In this letter, by writing the volume as a function of coordinates of atoms,we present a new constant-pressure molecular dynamics method with parametersfree. This method is specially appropriate for the finite system in which theperiodic boundary condition does not exist. Simulations on the carbon nanotubeand the Ni nanoparticle clearly demonstrate the validity of the method. Byusing this method, one can easily obtain the equation of states for the finitesystem under the external pressure.Comment: RevTex, 5 pages, 3 figures, submitted to Phys. Rev. Let

A new constant-pressure molecular dynamics method for finite systems