The interaction of electron spins with homonuclear spin pairs in their vicinity is one the dominating mechanisms echo decay at low temperature and concentration. Here, we study this mechanism using established concepts envelope modulation (ESEEM). We obtain analytical expressions for Hahn echo, refocused stimulated Carr–Purcell pulse trains small numbers π pulses. well approximated by product n...

We study many-body corrections to the cotunneling current via a localized state with energy epsilon(d) at large bias voltages V. We show that the transfer of electron pairs, enabled by the Coulomb repulsion in the localized level, results in ionization resonance peaks in the third derivative of the current with respect to V, centered at eV=+/-2epsilon(d)/3. Our results predict the existence of ...

The bonding analysis of a chemical system is usually based on some descriptors. Distinct approaches are used to generate the bonding descriptors, whereby the usefulness of a particular approach is emphasized by the desire to yield a description consistent with the examined effects. Thus, whereas the bond path from the electron density gradient field yields the connectivity of the atomic fragmen...

Understanding and creating models that explain how electrons move and interact in metals has been at the heart of theoretical and experiment efforts for nearly 100 years. One approach to probing these systems is to devise a simple mathematical model of the electrons, which pares down the complexity of the system to its most basic elements. The Fermi-Hubbard model is one such model. It reduces e...

Electron–positron pair production in vacuum by a single focused laser pulse and by two counterpropagating colliding focused pulses is analyzed. A focused laser pulse is described using a realistic threedimensional model based on an exact solution of Maxwell’s equations. In particular, this model reproduces an important property of focused beams, namely, the existence of two types of waves with ...

The investigation of the inmedium properties of short lived neutral vector mesons (ρ, ω, φ) via detection of their decay in electron-positron pairs is one of the major issues of the CBM physics program. The strategies to reduce the combinatorial background in electron pair measurements with the CBM detector are discussed here. The simulations were performed for the collision system Au+Au at a b...

In this paper, we present a parity-preserving QED3 with spontaneous breaking of a local U(1)-symmetry. The breaking is accomplished by a potential of the φ6type. It is shown that a net attractive interaction appears in the Møller scattering (s and p-wave scattering between two electrons) as mediated by the gauge field and a Higgs scalar. This might favour a pair-condensation mechanism.