November 07, 2022
Minneapolis, United States
Simulation on time dependent voltage distribution regarding van der Waals tunneling gap
Since the discovery of graphene, a great number of studies have demonstrated exotic phenomena based on electrical properties of two-dimensional (2D) materials. Although 2D material systems particularly have a van der Waals (vdW) gap, it has been mostly neglected to understand experimentally observed longitudinal and Hall conductivities, usually denoted by σxx and σxy, respectively. To include phenomena related to vertical transport related to the vdW gaps, we develop a simulation tool on time-dependent voltage distribution, which can reproduce real situations in vdW-based devices. For that, we firstly propose a simulation model to account for not only the conventional fixed resistivity, but also a variable resistivity depending on interlayer voltage differences. We finally visualize the current distribution as a function of time under different voltage bias with our simulation. The developed simulation based on the resistance model can provide a good template to understand the dynamics on electrical properties of 2D-based systems.
Figure 1. The schematic image of the simulation and current density distribution obtained by the simulation.