We study the active dynamics of self-propelled asymmetrical colloidal particles (Janus particles) fueled by anAC electricfield. Both the speed and direction of the self-propulsion, and the strength of the attractive interaction between particles can be controlled by tuning the frequency of the applied electricfield and the ion concentration of the solution. The strong attractive force at high i...

We report the presence of a field-induced intermediate ferroelectric phase in pre-poled [111] oriented 0.955Pb(Zn1 / 3Nb2 / 3)O3– 0.045PbTiO3 (PZN–4.5%PT) single crystals, based on the dielectric, differential scanning calorimetry and pyroelectric measurements. It was found that this phase exists in a very narrow interval of 4.3 -C between the ferroelectric rhombohedral and tetragonal phases. T...

We discover a fundamental mechanism for the sharp increase in the diffusion rate of the motion of a charged particle in a uniform magnetic field when a time-periodic electricfield propagating orthogonally to the magnetic field is slightly tilted. It is associated with the degeneracies of the underlying motion; in fact, a two-degree of freedom mechanism of instability induces this behaviour. Unf...

On the basis of simple heuristic models, we show that atomic electrons can (1) amplify fields observed at the nucleus, (2) generate harmonics, and (3) drive higher multipolarities. We consider a model with the nucleus at the focus of a uniformly charged ellipsoid. It amplifies an oscillating external electric field and produces an oscillating electricfield gradient but no higher derivatives. Th...

A model of the polarization dust particles with trapped ions in an external electric field is presented. It based on self-consistent solution integral balance equation for ion density and Poisson potential. shown that, a low collisional regime, form spread shell maximum located at some distance from thecharged particle proportional to Debye length. The estimated polarizability dusty "quasiatoms...

Defection by an electricfield has been tested asameans to deposit size selected clusters. A hollow-cathode, glow-discharge, source has been used for the production of Cu clusters in the size range between 4 and 38 nm, while afield emission scanning microscope has been usedfor HREM investigation of the size and morphology of clusters supported on Alfoil. The deflected negative clusters demonstra...

Recent breakthroughs in quantum dot light-emitting devices (QD-LEDs) show their promise in the development of next-generation displays. However, the QD-LED with conventional ITO-based bottom emission structure is difficult to realize the high aperture ratio, electricfield-independent emission and flexible full-color displays. Hence, we demonstrate top-emitting QD-LEDs with dry microcontact prin...

For a long time the rather low doping efficiency of B in a-Si:H has been explained by the argument that almost all of the B is incorporated into threefold coordinated sites and that B is inert or nondoping in this configuration. Using ab initio molecular dynamics, we have studied the energetics and electronic structure ~doping! consequences of B incorporation into a-Si:H both with and without H...