Suppression of the Fano factor in nanoelectromechanical systems

We analyze the shot noise of a spin-degenerate electronic level coupled to an harmonic oscillator in the presence of relaxation. We show that the electromechanical coupling can induce a suppression of the Fano factor below the value expected without phonons View the MathML source. Moreover, in the presence of finite relaxation, the Fano factor can be even reduced below View the MathML source.