  We perform both classical molecular dynamics simulations and beam model
calculations to investigate the Young's modulus of kinked silicon nanowires
(KSiNWs). The Young's modulus is found to be highly sensitive to the arm length
of the kink and is essentially inversely proportional to the arm length. The
mechanism underlying the size dependence is found to be the interplay between
the kink angle potential and the arm length potential, where we obtain an
analytic relationship between the Young's modulus and the arm length of the
KSiNW. Our results provide insight into the application of this novel building
block in nanomechanical devices.
