L z , simulation box length in the z direction, is changed every 20fs while performing NVT thermostating every timestep. Normal stress, σ zz is monitored and used to explicate the nucleation phenomena. Henceforth, σ zz is interchangeably referred to as pressure, and has a non-positive value as our system is under tension. To obtain reasonable estimates of σ zz , for each case at least 5 (maximum 10) independent simulations are performed.