Light induced modulation of charge transport phenomena across the bistability region in [Fe(Htrz)2(trz)](BF4) spin crossover micro-rods

In this paper we report a photo-activated phenomena in [Fe(Htrz)2(trz)](BF4) spin crossover material based electrical device upon and after light irradiation.

Lyapunov Graph for Two-Parameters Map: Application to the Circle Map

In a Lyapunov graph the Lyapunov exponent, λ, is represented by a color in the parameter space. The color shade varies from black to white as λ goes from -∞ to 0. Some of the main aspects of the complex dynamics of the circle map (θn+1=θn+Ω+(1/2π)K sin (2πθn)( mod 1)), can be obtained by analyzing its Lyapunov graph. For K>1 the map develops one maximum and one minimum and may exhibit bistability that corresponds to the intersection of topological structures (stability arms) in the Lyapunov graph. In the bistability region, there is a strong sensitivity to the initial condition. Using the fact that each of the coexisting stable solution is associated to one of the extrema of the map, we construct a function that allows to obtain the boundary separating the set of initial conditions converging to one stable solution, from the set of initial conditions converging to the other coexisting stable solution.

Transverse Patterns in the Bistable Resonant Tunneling Systems Under Ballistic Lateral Transport

We report the theoretical investigation of the phenomenon of the formation of patterns transverse to the tunneling current in resonant tunneling double-barrier heterostructures in the case of wide range of bistable voltages. In contrast to the case of the patterns in the structures with small region of bistability, for pronounced bistability electron lateral transport is strongly nonlocal. We performed numerical simulations of the stationary and mobile patterns using special variational procedure. Our results revealed that though the possible types of patterns remains the same as for the structures with small bistability region, their characteristics are modified considerably.