Fluctuator Model of Memory Dip in Hopping Insulators

Abstract

We show that the non-equilibrium dynamic in two-dimensional hopping insulators close to metal-dielectric transition is sensitive to electric fields confinement inside the sample, which leads to a nearly thermally activated conductance behavior and a strong non-equilibrium conductance response to the gate voltage, including a memory dip in a field dependence of conductance.

Density of states of two-dimensional systems with long-range logarithmic interactions

“…We expect that LI is relevant over a wide temperature range [42], where a hopping distance controlling the variable range hopping logarithmically depends on the temperature [26]. The long-range character of the LI is likely to enhance the importance of the simultaneous many-electron jumps [43], which may be relevant for the understanding of glassy relaxation in electronic systems [44,45]. The important subclass of 2D systems with high dielectric permittivity are superconducting films in the critical vicinity of the SIT.…”