Comparative analysis of different techniques for controlling ratchet effect in a periodic array of asymmetric antidots

Ballistic simulation of Ratchet effect in antidot lattices patterned on graphene

“…The spatial asymmetry of defects in the x-direction implies a preferred direction for the current flow, namely in the positive x-direction due to the triangle orientation, regardless of the sign of E y : this fact can easily explain the rising of the electronic ratchet transport. The same principle can be used for creation of detectors operating at room temperature in the microwave/terahertz radiation range [11]. Importantly, the SM approach avoids the use of a Dirac-like continuum description of charge transport: the presence of abrupt discontinuities, i.e.…”

Current-Voltage Characterization of Multi-Port Graphene Based Geometric Diodes for High-Frequency Electromagnetic Harvesting

“…An interesting example of asymmetry-driven transport is given by the "ratchet effect", originally introduced by R. Feynman in 1963 [16]. Several devices try to implement the ratchet concept [17]- [24]: nano-patterns of asymmetric dots in two-dimensional electron gas (2DEG) at surface heterostructures and biological molecular motors, where the Brownian random molecular motion (thermal fluctuation) gives rise to specific -linear of rotational -movements. One of the potential advantages of ballistic planar diodes with respect to other configurations, such as MIMs, is given by their typically small capacitive effects, in contrast to the relatively high capacitance of MIM diodes, where two parallel metal plates are overlapping at short distance.…”

A Methodology to Study the Electromagnetic Behavior of a Cryogenic Metallic System Used to Control the Ratchet Effect

“…Due to the complexity of this closed setup, a methodology is proposed that helps in having a complete picture of the closed system used and hence improving its electromagnetic response. Several electromagnetic models have been created and simulated using full-wave electromagnetic simulation finite element method to represent the setup that could be used at room temperature [18][19][20] and the actual setup used at low temperature [16,21]. Three descriptors have been computed that can quantify the Ratchet Effect inside the cryogenic system; the distribution of the electric field inside the cavity, the uniformity of the incident electric field linear polarization and the uniformity of the incident electric field density on the sample surface.…”