2017/11/27 by Pablo Rodriguez-López, Pablo Rodriguez-Lopez, Alberto Cortijo
Materials Science · Mathematics · Physics and Astronomy · #2D Materials and Applications #Acoustics #Berry connection and curvature #Condensed matter physics #Curvature #Dirac (video compression format) #Ferroelectricity #Geometric phase #Geometry #Magnetic field #Magnetic moment #Magnetoelectric effect #Mathematics #Multiferroics #Multiferroics and related materials #Physics #Piezoelectricity #Planar #Quantum mechanics #Strain (injury) #Topological Materials and Phenomena #cond-mat.mes-hall #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.97.235128
published as Phys. Rev. B 97, 235128 (2018) · 7 pages, 2 figures
arxiv created 2017/11/27 · openalex publication_date 2018/06/15 · arxiv updated 2018/06/20 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
The magnetoelectric response in inversion-breaking two-dimensional Dirac systems induced by strain is analyzed. It is shown that, in the same way that the piezoelectric response in these materials is related to the valley Chern number, the magnetic field and strain-induced electric polarization is related to the nontrivial Berry curvature and the derivative of the orbital magnetic moment per valley. We also show that the elastic vector field \mathscAel present in these systems drives the system out of equilibrium in presence of a magnetic field, allowing for such electrical response. In contrast, we show that the strain plays a very different role in the generation of a nonequilibrium magnetization and optical activity. In this case, it is the modification of the band structure induced by strain that allows for the magnetic response to external electric perturbations.