Driving-voltage-induced mechanical force oscillations in metal quantum   point contacts
  We predict that the mesoscopic tensile force fluctuations in metal quantum point contacts (nanowires) arise as a result of finite electric voltage on the contact. They are due to reconfiguration of the electronic subsystem and are correlated with the nonlinearities of the current-voltage characteristics of the contact. The observation of the effect would directly confirm the recently suggested "free-electron" mechanism of mesoscopic force fluctuations observed in nanowires under deformation. The related magnetic susceptibility fluctuations and role of topology of the wire cross section are discussed as well 
Alexandre M. Zagoskin