Coulomb Blockade in a Field Emitting Freely Suspended Island

We observe staircase current-voltage characteristics from an isolated nanomechanical island. The island is fixed by CF$_{2}$ connections, which makes the structure suspended 1µm above SiO$_{2}$. The noteworthy difference to the ``orthodox'' single electron transistors is the fact that we observe Coulomb blockade in conjunction with field emission. We can trace and reproduce the transition from staircase in the high bias regime. A theoretical model based on field emission current reproduces the experimental data. The full profile of the current-voltage measurement shows the transition from Coulomb staircase current to island field emission current.