A suspended fluid film with two free surfaces convects when a sufficiently large voltage is applied across it. We present a linear stability analysis for this system. The forces driving convection are due to the interaction of the applied electric field with space charge which develops near the free surfaces. Our analysis is similar to that for the two-dimensional Bénard problem, but with impor...

Interfacial polarization in electrolytes or other ionic media is a very well known phenomenon in the connection to the relative surface potential difference. Nevertheless, the created space charge affects the distribution of charge carriers in the electrolyte itself similarly to the field effects in semiconductors. This results in the number of secondary effects from the dielectrophoresis to th...

We discuss the radiation reaction problem for an electric charge moving in flat space-time of arbitrary dimensions. It is shown that four is the unique dimension where a local differential equation exists accounting for the radiation reaction and admitting a consistent mass-renormalization (the Dirac-Lorentz equation). In odd dimensions the Huygens principle does not hold; as a result, the radi...

In scanning transmission electron microscopy (STEM), single atoms can be imaged by detecting electrons scattered through high angles using post-specimen, annular-type detectors. Recently, it has been shown that the atomic-scale electric field of both the positive atomic nuclei and the surrounding negative electrons within crystalline materials can be probed by atomic-resolution differential pha...

The purpose of this paper is to show that we can define different vector potentials in the problems of Aharonov-Bohm type, in such a way that they give the same physical results as the one originally proposed by Aharonov and Bohm, except in the regions of space where the fields become singular. We argue that a modified quantization condition comes out for the electric charge that may open up th...

The decoupling of scalar particles in split supersymmetry makes the spectrum of squarks irrelevant for low energy processes. Nevertheless, the structure of the vacuum is sensitive to the spectrum of squarks, even when the supersymmetry breaking scale is large. In this note, we show that in certain regions of the parameter space, squarks could develop radiatively tachyonic masses, thus breaking ...

A new class of electrically charged wormholes is described in which the outer two sphere is not spanned by a compact coorientable hypersurface. These wormholes can therefore display net electric charge from the source free Maxwell’s equation. This extends the work of Sorkin on non-space orientable manifolds, to spacetimes which do not admit a time orientation. The work is motivated by the sugge...

We calculate the exact Kohn-Sham potential that describes, within time-dependent density-functional theory, the propagation of an electron quasiparticle wave packet of nonzero crystal momentum added to a ground-state model semiconductor. The potential is observed to have a highly nonlocal functional dependence on the charge density, in both space and time, giving rise to features entirely lacki...

We begin with interactions of particles that moving with constant velocity in free space. If the material walls are far from the particles, their effect in the first approximation can be neglected. Let us consider a leading particle of charge q moving with velocity v, and a trailing particle of unit charge moving behind the leading one on a parallel path at a distance s with an offset x, as sho...

The optical, fluorescent, and photoconductive properties of solution-processable functionalized pentacene and anthradithiophene (ADT) derivatives are presented. Considerable fluorescence quantum yields of ∼70-75% and ∼40-50% were observed in several ADT derivatives in toluene solutions and in thin films, respectively. No electric field-induced fluorescence quenching was observed in films at app...