We present the derivation and code implementation of a first-principles methodology to calculate lattice-mediated contributions bulk flexoelectric tensor. The approach is based on our recent analytical long-wavelength extension density-functional perturbation theory [Royo Stengel, Phys. Rev. X 9, 021050 (2019)], avoids cumbersome numerical derivatives with respect wave vector that were adopted ...

Biological membranes undergo noticeable thermal fluctuations at physiological temperatures. When two approach each other, they hinder the out-of-plane of other. This hindrance leads to an entropic repulsive force between which, in interplay with attractive and forces owing other sources, affects a range biological functions: cell adhesion, membrane fusion, self-assembly, binding–unbinding trans...

Flexoelectricity is a property of dielectric materials whereby they exhibit electric polarization induced by strain gradients; while this effect can be negligible at the macroscale, it become dominant nanoscale, where gradients turn out to tremendous. Previous works have demonstrated that flexoelectricity coupled with piezoelectricity enables mechanical writing ferroelectric polarization. When ...

this paper studies the role of the conceptual models of the policy makers in the quality of prioritizing problems in the agenda setting stage of public policy cycle.  several factors contribute to perceiving problems, presenting clear definitions of them, prioritizing them and then problem setting in the format of agenda for policy makers. however, expecting to examine the theories of enactment...

Although rare, spontaneous breakdown of inversion symmetry sometimes occurs in a material which is metallic: these are commonly known as polar metals or ferroelectric metals. Their 'polarization', however, cannot be switched via an electric field, limits the experimental control over band topology. Here we shall investigate, first-principles theory, flexoelectricity possible way around this obs...