Showing papers by "Nuno M. R. Peres published in 2023"
TL;DR: In this article , the authors show that by applying a circularly polarized laser field to a 2D honeycomb ferromagnet which is uniaxially strained in either the zig-zag or armchair direction, it is possible to generate a synthetic Dzyaloshinskii-Moriya interaction (DMI) tunable by the intensity of the applied electric field, as well as by the magnitude of applied strain.
Abstract: We argue that strain engineering is a powerful tool which may facilitate the experimental realization and control of topological phases in laser-driven 2D ferromagnetic systems. To this extent, we show that by applying a circularly polarized laser field to a 2D honeycomb ferromagnet which is uniaxially strained in either the zig-zag or armchair direction, it is possible to generate a synthetic Dzyaloshinskii-Moriya interaction (DMI) tunable by the intensity of the applied electric field, as well as by the magnitude of applied strain. Such deformations enable transitions to phases with opposite sign of Chern number, or to trivial phases. These are basic results that could pave the way for the development of a new field of Strain Engineered Topological Spintronics (SETS).
TL;DR: Maize and Smetanka as mentioned in this paper pointed out that an overall factor of 2 cannot change the physical properties of the problem and therefore the qualitative validity of the results, and they also pointed out the limitation of the overall factor.
Abstract: The purpose of the original paper by Antão and Peres [ 1 ] is to show that the polarisability of an atomic system, when in the vicinity of a surface, can be used as a nanometric ruler, emphasizing the pedagogical value of Dalgarno – Lewis perturbation theory. Indeed this is stated in the abstract of [ 1 ] ‘ ...creating the possibility of using this quantity as a nanometric ruler ’ . That this is true, is evident from both fi gures 3 and 5 of [ 1 ] , where the distance to the surface determines the overall appearance of both the static ( fi gure 3 of [ 1 ] ) and dynamic ( fi gure 5 of [ 1 ] ) polarizability. Maize and Smetanka do not question the validity of these results, simply stressing that they are off by an overall factor of 2, which we acknowledge. As well understood, an overall factor of 2 cannot change the physical properties of the problem and therefore the qualitative validity of the results. The other minor aspects of Maize ’ s and Smetanka ’ s comments are the following: