Bistability signatures in nonequilibrium charge transport through   molecular quantum dots
  We investigate the transient nonequilibrium dynamics of a molecular junction biased by a finite voltage and strongly coupled to internal vibrational degrees of freedom. Using two different, numerical exact techniques, diagrammatic Monte Carlo and the multilayer multiconfiguration time-dependent Hartree method, we show that the steady state current through the junction may depend sensitively on the initial preparation of the system, thus revealing signatures of bistability. The influence of the bias voltage and the transient dynamics on the phenomenon of bistability is analyzed. Furthermore, a possible relation to the phenomenon of stochastic switching in nanoelectromecanical devices is discussed. 
Klaus Ferdinand Albrecht, Haobin Wang, Lothar Muehlbacher, Michael   Thoss, Andreas Komnik
cond-mat.mes-hall