Work function, deformation potential, and collapse of Landau levels in strained graphene and silicene

We perform a systematic ab initio study of the work function and its uniform strain dependence for graphene and silicene for both tensile and compressive strains. The Poisson ratios associated to armchair and zigzag strains are also computed. Basing on these results, we obtain the deformation potential, crucial for straintronics, as a function of the applied strain. Further, we propose a particular experimental setup with a special strain configuration that generates only electric field, while the pseudomagnetic field is absent. Then, applying a real magnetic field, one should be able to realize experimentally the spectacular phenomenon of the Landau levels collapse in graphene or related 2D materials.