• Non- V -representability of currents in time-dependent many-particle systems 

    D'Agosta, Roberto; Vignale, Giovanni, 1957- (American Physical Society, 2005)
    We argue that an arbitrarily chosen time-dependent current density is generically non-V-representable in a many-particle system; i.e., it cannot be obtained by applying only a time-dependent scalar potential to the system. ...